GCC Code Coverage Report


Directory: ./
File: src/eps/impls/krylov/krylovschur/ks-slice.c
Date: 2025-10-04 04:19:13
Exec Total Coverage
Lines: 850 919 92.5%
Functions: 21 21 100.0%
Branches: 2235 3968 56.3%

Line Branch Exec Source
1 /*
2 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
3 SLEPc - Scalable Library for Eigenvalue Problem Computations
4 Copyright (c) 2002-, Universitat Politecnica de Valencia, Spain
5
6 This file is part of SLEPc.
7 SLEPc is distributed under a 2-clause BSD license (see LICENSE).
8 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
9 */
10 /*
11 SLEPc eigensolver: "krylovschur"
12
13 Method: Krylov-Schur with spectrum slicing for symmetric eigenproblems
14
15 References:
16
17 [1] R.G. Grimes et al., "A shifted block Lanczos algorithm for
18 solving sparse symmetric generalized eigenproblems", SIAM J.
19 Matrix Anal. Appl. 15(1):228-272, 1994.
20
21 [2] C. Campos and J.E. Roman, "Spectrum slicing strategies based
22 on restarted Lanczos methods", Numer. Algor. 60(2):279-295,
23 2012.
24 */
25
26 #include <slepc/private/epsimpl.h>
27 #include "krylovschur.h"
28
29 static PetscBool cited = PETSC_FALSE;
30 static const char citation[] =
31 "@Article{slepc-slice,\n"
32 " author = \"C. Campos and J. E. Roman\",\n"
33 " title = \"Strategies for spectrum slicing based on restarted {Lanczos} methods\",\n"
34 " journal = \"Numer. Algorithms\",\n"
35 " volume = \"60\",\n"
36 " number = \"2\",\n"
37 " pages = \"279--295\",\n"
38 " year = \"2012,\"\n"
39 " doi = \"https://doi.org/10.1007/s11075-012-9564-z\"\n"
40 "}\n";
41
42 #define SLICE_PTOL PETSC_SQRT_MACHINE_EPSILON
43
44 1042 static PetscErrorCode EPSSliceResetSR(EPS eps)
45 {
46 1042 EPS_KRYLOVSCHUR *ctx=(EPS_KRYLOVSCHUR*)eps->data;
47 1042 EPS_SR sr=ctx->sr;
48 1042 EPS_shift s;
49
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1042 PetscFunctionBegin;
51
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1042 if (sr) {
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394 if (ctx->npart>1) {
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194 PetscCall(BVDestroy(&sr->V));
54
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194 PetscCall(PetscFree4(sr->eigr,sr->eigi,sr->errest,sr->perm));
55 }
56 /* Reviewing list of shifts to free memory */
57 394 s = sr->s0;
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394 if (s) {
59 321 while (s->neighb[1]) {
60 124 s = s->neighb[1];
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321 PetscCall(PetscFree(s->neighb[0]));
62 }
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197 PetscCall(PetscFree(s));
64 }
65
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394 PetscCall(PetscFree(sr));
66 }
67 1042 ctx->sr = NULL;
68
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1042 PetscFunctionReturn(PETSC_SUCCESS);
69 }
70
71 805 PetscErrorCode EPSReset_KrylovSchur_Slice(EPS eps)
72 {
73 805 EPS_KRYLOVSCHUR *ctx=(EPS_KRYLOVSCHUR*)eps->data;
74
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805 PetscFunctionBegin;
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805 if (!ctx->global) PetscFunctionReturn(PETSC_SUCCESS);
77 /* Reset auxiliary EPS */
78
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324 PetscCall(EPSSliceResetSR(ctx->eps));
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324 PetscCall(EPSReset(ctx->eps));
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324 PetscCall(EPSSliceResetSR(eps));
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324 PetscCall(PetscFree(ctx->inertias));
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324 PetscCall(PetscFree(ctx->shifts));
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54 PetscFunctionReturn(PETSC_SUCCESS);
84 }
85
86 314 PetscErrorCode EPSDestroy_KrylovSchur_Slice(EPS eps)
87 {
88 314 EPS_KRYLOVSCHUR *ctx=(EPS_KRYLOVSCHUR*)eps->data;
89
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314 PetscFunctionBegin;
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314 if (!ctx->global) PetscFunctionReturn(PETSC_SUCCESS);
92 /* Destroy auxiliary EPS */
93
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157 PetscCall(EPSReset_KrylovSchur_Slice(eps));
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157 PetscCall(EPSDestroy(&ctx->eps));
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157 if (ctx->npart>1) {
96
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77 PetscCall(PetscSubcommDestroy(&ctx->subc));
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77 if (ctx->commset) {
98
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77 PetscCallMPI(MPI_Comm_free(&ctx->commrank));
99 77 ctx->commset = PETSC_FALSE;
100 }
101
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77 PetscCall(ISDestroy(&ctx->isrow));
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77 PetscCall(ISDestroy(&ctx->iscol));
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77 PetscCall(MatDestroyMatrices(1,&ctx->submata));
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77 PetscCall(MatDestroyMatrices(1,&ctx->submatb));
105 }
106
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157 PetscCall(PetscFree(ctx->subintervals));
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157 PetscCall(PetscFree(ctx->nconv_loc));
108
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26 PetscFunctionReturn(PETSC_SUCCESS);
109 }
110
111 /*
112 EPSSliceAllocateSolution - Allocate memory storage for common variables such
113 as eigenvalues and eigenvectors. The argument extra is used for methods
114 that require a working basis slightly larger than ncv.
115 */
116 97 static PetscErrorCode EPSSliceAllocateSolution(EPS eps,PetscInt extra)
117 {
118 97 EPS_KRYLOVSCHUR *ctx=(EPS_KRYLOVSCHUR*)eps->data;
119 97 PetscReal eta;
120 97 PetscInt k;
121 97 BVType type;
122 97 BVOrthogType orthog_type;
123 97 BVOrthogRefineType orthog_ref;
124 97 BVOrthogBlockType ob_type;
125 97 Mat matrix;
126 97 Vec t;
127 97 EPS_SR sr = ctx->sr;
128
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97 PetscFunctionBegin;
130 /* allocate space for eigenvalues and friends */
131 97 k = PetscMax(1,sr->numEigs);
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97 PetscCall(PetscFree4(sr->eigr,sr->eigi,sr->errest,sr->perm));
133
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97 PetscCall(PetscMalloc4(k,&sr->eigr,k,&sr->eigi,k,&sr->errest,k,&sr->perm));
134
135 /* allocate sr->V and transfer options from eps->V */
136
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97 PetscCall(BVDestroy(&sr->V));
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97 PetscCall(BVCreate(PetscObjectComm((PetscObject)eps),&sr->V));
138
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97 if (!eps->V) PetscCall(EPSGetBV(eps,&eps->V));
139
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97 if (!((PetscObject)eps->V)->type_name) PetscCall(BVSetType(sr->V,BVMAT));
140 else {
141
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97 PetscCall(BVGetType(eps->V,&type));
142
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97 PetscCall(BVSetType(sr->V,type));
143 }
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97 PetscCall(STMatCreateVecsEmpty(eps->st,&t,NULL));
145
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97 PetscCall(BVSetSizesFromVec(sr->V,t,k));
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97 PetscCall(VecDestroy(&t));
147
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97 PetscCall(EPS_SetInnerProduct(eps));
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97 PetscCall(BVGetMatrix(eps->V,&matrix,NULL));
149
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97 PetscCall(BVSetMatrix(sr->V,matrix,PETSC_FALSE));
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97 PetscCall(BVGetOrthogonalization(eps->V,&orthog_type,&orthog_ref,&eta,&ob_type));
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97 PetscCall(BVSetOrthogonalization(sr->V,orthog_type,orthog_ref,eta,ob_type));
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14 PetscFunctionReturn(PETSC_SUCCESS);
153 }
154
155 197 static PetscErrorCode EPSSliceGetEPS(EPS eps)
156 {
157 197 EPS_KRYLOVSCHUR *ctx=(EPS_KRYLOVSCHUR*)eps->data,*ctx_local;
158 197 BV V;
159 197 BVType type;
160 197 PetscReal eta;
161 197 BVOrthogType orthog_type;
162 197 BVOrthogRefineType orthog_ref;
163 197 BVOrthogBlockType ob_type;
164 197 PetscInt i;
165 197 PetscReal h,a,b;
166 197 PetscRandom rand;
167 197 EPS_SR sr=ctx->sr;
168
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197 PetscFunctionBegin;
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197 if (!ctx->eps) PetscCall(EPSKrylovSchurGetChildEPS(eps,&ctx->eps));
171
172 /* Determine subintervals */
173
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197 if (ctx->npart==1) {
174 100 a = eps->inta; b = eps->intb;
175 } else {
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97 if (!ctx->subintset) { /* uniform distribution if no set by user */
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45 PetscCheck(sr->hasEnd,PetscObjectComm((PetscObject)eps),PETSC_ERR_ARG_WRONG,"Global interval must be bounded for splitting it in uniform subintervals");
178 45 h = (eps->intb-eps->inta)/ctx->npart;
179 45 a = eps->inta+ctx->subc->color*h;
180
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45 b = (ctx->subc->color==ctx->npart-1)?eps->intb:eps->inta+(ctx->subc->color+1)*h;
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45 PetscCall(PetscFree(ctx->subintervals));
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45 PetscCall(PetscMalloc1(ctx->npart+1,&ctx->subintervals));
183
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135 for (i=0;i<ctx->npart;i++) ctx->subintervals[i] = eps->inta+h*i;
184 45 ctx->subintervals[ctx->npart] = eps->intb;
185 } else {
186 52 a = ctx->subintervals[ctx->subc->color];
187 52 b = ctx->subintervals[ctx->subc->color+1];
188 }
189 }
190
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197 PetscCall(EPSSetInterval(ctx->eps,a,b));
191
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197 PetscCall(EPSSetConvergenceTest(ctx->eps,eps->conv));
192
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197 PetscCall(EPSSetDimensions(ctx->eps,ctx->nev,ctx->ncv,ctx->mpd));
193
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197 PetscCall(EPSKrylovSchurSetLocking(ctx->eps,ctx->lock));
194
195 197 ctx_local = (EPS_KRYLOVSCHUR*)ctx->eps->data;
196 197 ctx_local->detect = ctx->detect;
197
198 /* transfer options from eps->V */
199
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197 PetscCall(EPSGetBV(ctx->eps,&V));
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197 PetscCall(BVGetRandomContext(V,&rand)); /* make sure the random context is available when duplicating */
201
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197 if (!eps->V) PetscCall(EPSGetBV(eps,&eps->V));
202
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197 if (!((PetscObject)eps->V)->type_name) PetscCall(BVSetType(V,BVMAT));
203 else {
204
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187 PetscCall(BVGetType(eps->V,&type));
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187 PetscCall(BVSetType(V,type));
206 }
207
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197 PetscCall(BVGetOrthogonalization(eps->V,&orthog_type,&orthog_ref,&eta,&ob_type));
208
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197 PetscCall(BVSetOrthogonalization(V,orthog_type,orthog_ref,eta,ob_type));
209
210 197 ctx->eps->which = eps->which;
211 197 ctx->eps->max_it = eps->max_it;
212 197 ctx->eps->tol = eps->tol;
213 197 ctx->eps->purify = eps->purify;
214
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197 if (eps->tol==(PetscReal)PETSC_DETERMINE) eps->tol = SLEPC_DEFAULT_TOL;
215
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197 PetscCall(EPSSetProblemType(ctx->eps,eps->problem_type));
216
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197 PetscCall(EPSSetUp(ctx->eps));
217 197 ctx->eps->nconv = 0;
218 197 ctx->eps->its = 0;
219
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14717 for (i=0;i<ctx->eps->ncv;i++) {
220 14520 ctx->eps->eigr[i] = 0.0;
221 14520 ctx->eps->eigi[i] = 0.0;
222 14520 ctx->eps->errest[i] = 0.0;
223 }
224
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34 PetscFunctionReturn(PETSC_SUCCESS);
225 }
226
227 462 static PetscErrorCode EPSSliceGetInertia(EPS eps,PetscReal shift,PetscInt *inertia,PetscInt *zeros)
228 {
229 462 KSP ksp,kspr;
230 462 PC pc;
231 462 Mat F;
232 462 PetscReal nzshift=shift;
233 462 PetscBool flg;
234
235
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462 PetscFunctionBegin;
236
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462 if (shift >= PETSC_MAX_REAL) { /* Right-open interval */
237 if (inertia) *inertia = eps->n;
238
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462 } else if (shift <= PETSC_MIN_REAL) {
239
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10 if (inertia) *inertia = 0;
240
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10 if (zeros) *zeros = 0;
241 } else {
242 /* If the shift is zero, perturb it to a very small positive value.
243 The goal is that the nonzero pattern is the same in all cases and reuse
244 the symbolic factorizations */
245
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452 nzshift = (shift==0.0)? 10.0/PETSC_MAX_REAL: shift;
246
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452 PetscCall(STSetShift(eps->st,nzshift));
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452 PetscCall(STGetKSP(eps->st,&ksp));
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452 PetscCall(KSPGetPC(ksp,&pc));
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452 PetscCall(PetscObjectTypeCompare((PetscObject)pc,PCREDUNDANT,&flg));
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452 if (flg) {
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40 PetscCall(PCRedundantGetKSP(pc,&kspr));
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40 PetscCall(KSPGetPC(kspr,&pc));
253 }
254
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452 PetscCall(PCFactorGetMatrix(pc,&F));
255
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452 PetscCall(MatGetInertia(F,inertia,zeros,NULL));
256 }
257
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462 if (inertia) PetscCall(PetscInfo(eps,"Computed inertia at shift %g: %" PetscInt_FMT "\n",(double)nzshift,*inertia));
258
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81 PetscFunctionReturn(PETSC_SUCCESS);
259 }
260
261 /*
262 Dummy backtransform operation
263 */
264 197 static PetscErrorCode EPSBackTransform_Skip(EPS eps)
265 {
266
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197 PetscFunctionBegin;
267
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197 PetscFunctionReturn(PETSC_SUCCESS);
268 }
269
270 394 PetscErrorCode EPSSetUp_KrylovSchur_Slice(EPS eps)
271 {
272 394 EPS_KRYLOVSCHUR *ctx = (EPS_KRYLOVSCHUR*)eps->data,*ctx_glob;
273 394 EPS_SR sr,sr_loc,sr_glob;
274 394 PetscInt nEigs,dssz=1,i,zeros=0,off=0,method,hiteig=0;
275 394 PetscMPIInt nproc,rank=0,aux;
276 394 PetscReal r;
277 394 MPI_Request req;
278 394 Mat A,B=NULL;
279 394 DSParallelType ptype;
280 394 MPI_Comm child;
281
282
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394 PetscFunctionBegin;
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394 if (eps->nev==0) eps->nev = 1;
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394 if (ctx->global) {
285
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197 EPSCheckHermitianDefiniteCondition(eps,PETSC_TRUE," with spectrum slicing");
286
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197 EPSCheckSinvertCayleyCondition(eps,PETSC_TRUE," with spectrum slicing");
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197 PetscCheck(eps->inta!=eps->intb,PetscObjectComm((PetscObject)eps),PETSC_ERR_SUP,"This solver does not support computing all eigenvalues unless you provide a computational interval with EPSSetInterval()");
288
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197 PetscCheck(eps->intb<PETSC_MAX_REAL || eps->inta>PETSC_MIN_REAL,PetscObjectComm((PetscObject)eps),PETSC_ERR_ARG_WRONG,"The defined computational interval should have at least one of their sides bounded");
289
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197 PetscCheck(eps->nds==0,PetscObjectComm((PetscObject)eps),PETSC_ERR_SUP,"Spectrum slicing not supported in combination with deflation space");
290
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197 EPSCheckUnsupportedCondition(eps,EPS_FEATURE_ARBITRARY | EPS_FEATURE_REGION | EPS_FEATURE_STOPPING,PETSC_TRUE," with spectrum slicing");
291
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197 EPSCheckIgnoredCondition(eps,EPS_FEATURE_BALANCE,PETSC_TRUE," with spectrum slicing");
292
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197 if (eps->tol==(PetscReal)PETSC_DETERMINE) {
293 #if defined(PETSC_USE_REAL_SINGLE)
294 eps->tol = SLEPC_DEFAULT_TOL;
295 #else
296 /* use tighter tolerance */
297 92 eps->tol = SLEPC_DEFAULT_TOL*1e-2;
298 #endif
299 }
300
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197 if (eps->max_it==PETSC_DETERMINE) eps->max_it = 100;
301
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197 if (ctx->nev==1) ctx->nev = PetscMin(40,eps->n); /* nev not set, use default value */
302
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197 PetscCheck(eps->n<=10 || ctx->nev>=10,PetscObjectComm((PetscObject)eps),PETSC_ERR_ARG_WRONG,"nev cannot be less than 10 in spectrum slicing runs");
303 }
304 394 eps->ops->backtransform = EPSBackTransform_Skip;
305
306 /* create spectrum slicing context and initialize it */
307
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394 PetscCall(EPSSliceResetSR(eps));
308
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394 PetscCall(PetscNew(&sr));
309 394 ctx->sr = sr;
310 394 sr->itsKs = 0;
311 394 sr->nleap = 0;
312 394 sr->nMAXCompl = eps->nev/4;
313 394 sr->iterCompl = eps->max_it/4;
314 394 sr->sPres = NULL;
315 394 sr->nS = 0;
316
317
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394 if (ctx->npart==1 || ctx->global) {
318 /* check presence of ends and finding direction */
319
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297 if ((eps->inta > PETSC_MIN_REAL && !(ctx->subintervals && ctx->subintervals[0]==ctx->subintervals[1])) || eps->intb >= PETSC_MAX_REAL) {
320 277 sr->int0 = eps->inta;
321 277 sr->int1 = eps->intb;
322 277 sr->dir = 1;
323
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277 if (eps->intb >= PETSC_MAX_REAL) { /* Right-open interval */
324 sr->hasEnd = PETSC_FALSE;
325 277 } else sr->hasEnd = PETSC_TRUE;
326 } else {
327 20 sr->int0 = eps->intb;
328 20 sr->int1 = eps->inta;
329 20 sr->dir = -1;
330 20 sr->hasEnd = PetscNot(eps->inta <= PETSC_MIN_REAL);
331 }
332 }
333
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394 if (ctx->global) {
334
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197 PetscCall(EPSSetDimensions_Default(eps,&ctx->nev,&ctx->ncv,&ctx->mpd));
335 /* create subintervals and initialize auxiliary eps for slicing runs */
336
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197 PetscCall(EPSKrylovSchurGetChildEPS(eps,&ctx->eps));
337 /* prevent computation of factorization in global eps */
338
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197 PetscCall(STSetTransform(eps->st,PETSC_FALSE));
339
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197 PetscCall(EPSSliceGetEPS(eps));
340 197 sr_loc = ((EPS_KRYLOVSCHUR*)ctx->eps->data)->sr;
341
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197 if (ctx->npart>1) {
342
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97 PetscCall(PetscSubcommGetChild(ctx->subc,&child));
343
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97 if ((sr->dir>0&&ctx->subc->color==0)||(sr->dir<0&&ctx->subc->color==ctx->npart-1)) sr->inertia0 = sr_loc->inertia0;
344
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97 PetscCallMPI(MPI_Comm_rank(child,&rank));
345
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97 if (!rank) {
346
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82 PetscCall(PetscMPIIntCast((sr->dir>0)?0:ctx->npart-1,&aux));
347
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164 PetscCallMPI(MPI_Bcast(&sr->inertia0,1,MPIU_INT,aux,ctx->commrank));
348 }
349
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194 PetscCallMPI(MPI_Bcast(&sr->inertia0,1,MPIU_INT,0,child));
350
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97 PetscCall(PetscFree(ctx->nconv_loc));
351
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97 PetscCall(PetscMalloc1(ctx->npart,&ctx->nconv_loc));
352
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97 PetscCallMPI(MPI_Comm_size(((PetscObject)eps)->comm,&nproc));
353
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97 if (sr->dir<0) off = 1;
354
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97 if (nproc%ctx->npart==0) { /* subcommunicators with the same size */
355
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52 PetscCall(PetscMPIIntCast(sr_loc->numEigs,&aux));
356
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104 PetscCallMPI(MPI_Allgather(&aux,1,MPI_INT,ctx->nconv_loc,1,MPI_INT,ctx->commrank));
357
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104 PetscCallMPI(MPI_Allgather(sr_loc->dir==sr->dir?&sr_loc->int0:&sr_loc->int1,1,MPIU_REAL,ctx->subintervals+off,1,MPIU_REAL,ctx->commrank));
358 } else {
359
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45 PetscCallMPI(MPI_Comm_rank(child,&rank));
360
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45 if (!rank) {
361
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30 PetscCall(PetscMPIIntCast(sr_loc->numEigs,&aux));
362
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60 PetscCallMPI(MPI_Allgather(&aux,1,MPI_INT,ctx->nconv_loc,1,MPI_INT,ctx->commrank));
363
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60 PetscCallMPI(MPI_Allgather(sr_loc->dir==sr->dir?&sr_loc->int0:&sr_loc->int1,1,MPIU_REAL,ctx->subintervals+off,1,MPIU_REAL,ctx->commrank));
364 }
365
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45 PetscCall(PetscMPIIntCast(ctx->npart,&aux));
366
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90 PetscCallMPI(MPI_Bcast(ctx->nconv_loc,aux,MPI_INT,0,child));
367
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90 PetscCallMPI(MPI_Bcast(ctx->subintervals+off,aux,MPIU_REAL,0,child));
368 }
369 97 nEigs = 0;
370
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291 for (i=0;i<ctx->npart;i++) nEigs += ctx->nconv_loc[i];
371 } else {
372 100 nEigs = sr_loc->numEigs;
373 100 sr->inertia0 = sr_loc->inertia0;
374 100 sr->dir = sr_loc->dir;
375 }
376 197 sr->inertia1 = sr->inertia0+sr->dir*nEigs;
377 197 sr->numEigs = nEigs;
378 197 eps->nev = nEigs;
379 197 eps->ncv = nEigs;
380 197 eps->mpd = nEigs;
381 } else {
382 197 ctx_glob = (EPS_KRYLOVSCHUR*)ctx->eps->data;
383 197 sr_glob = ctx_glob->sr;
384
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197 if (ctx->npart>1) {
385 97 sr->dir = sr_glob->dir;
386
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97 sr->int0 = (sr->dir==1)?eps->inta:eps->intb;
387
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97 sr->int1 = (sr->dir==1)?eps->intb:eps->inta;
388
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97 if ((sr->dir>0&&ctx->subc->color==ctx->npart-1)||(sr->dir<0&&ctx->subc->color==0)) sr->hasEnd = sr_glob->hasEnd;
389 56 else sr->hasEnd = PETSC_TRUE;
390 }
391 /* sets first shift */
392
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301 PetscCall(STSetShift(eps->st,(sr->int0==0.0)?10.0/PETSC_MAX_REAL:sr->int0));
393
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197 PetscCall(STSetUp(eps->st));
394
395 /* compute inertia0 */
396
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342 PetscCall(EPSSliceGetInertia(eps,sr->int0,&sr->inertia0,ctx->detect?&zeros:NULL));
397 /* undocumented option to control what to do when an eigenvalue is found:
398 - error out if it's the endpoint of the user-provided interval (or sub-interval)
399 - if it's an endpoint computed internally:
400 + if hiteig=0 error out
401 + else if hiteig=1 the subgroup that hit the eigenvalue does nothing
402 + otherwise the subgroup that hit the eigenvalue perturbs the shift and recomputes inertia
403 */
404
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197 PetscCall(PetscOptionsGetInt(NULL,NULL,"-eps_krylovschur_hiteigenvalue",&hiteig,NULL));
405
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197 if (zeros) { /* error in factorization */
406 PetscCheck(sr->int0!=ctx->eps->inta && sr->int0!=ctx->eps->intb,((PetscObject)eps)->comm,PETSC_ERR_USER,"Found singular matrix for the transformed problem in the interval endpoint");
407 PetscCheck(!ctx_glob->subintset || hiteig,((PetscObject)eps)->comm,PETSC_ERR_USER,"Found singular matrix for the transformed problem in an interval endpoint defined by user");
408 if (hiteig==1) { /* idle subgroup */
409 sr->inertia0 = -1;
410 } else { /* perturb shift */
411 sr->int0 *= (1.0+SLICE_PTOL);
412 PetscCall(EPSSliceGetInertia(eps,sr->int0,&sr->inertia0,&zeros));
413 PetscCheck(zeros==0,((PetscObject)eps)->comm,PETSC_ERR_CONV_FAILED,"Inertia computation fails in %g",(double)sr->int1);
414 }
415 }
416
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197 if (ctx->npart>1) {
417
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97 PetscCall(PetscSubcommGetChild(ctx->subc,&child));
418 /* inertia1 is received from neighbour */
419
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97 PetscCallMPI(MPI_Comm_rank(child,&rank));
420
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97 if (!rank) {
421
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82 if (sr->inertia0!=-1 && ((sr->dir>0 && ctx->subc->color>0) || (sr->dir<0 && ctx->subc->color<ctx->npart-1))) { /* send inertia0 to neighbour0 */
422
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41 PetscCall(PetscMPIIntCast(ctx->subc->color-sr->dir,&aux));
423
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41 PetscCallMPI(MPIU_Isend(&sr->inertia0,1,MPIU_INT,aux,0,ctx->commrank,&req));
424
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41 PetscCallMPI(MPIU_Isend(&sr->int0,1,MPIU_REAL,aux,0,ctx->commrank,&req));
425 }
426
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82 if ((sr->dir>0 && ctx->subc->color<ctx->npart-1)|| (sr->dir<0 && ctx->subc->color>0)) { /* receive inertia1 from neighbour1 */
427
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41 PetscCall(PetscMPIIntCast(ctx->subc->color+sr->dir,&aux));
428
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41 PetscCallMPI(MPI_Recv(&sr->inertia1,1,MPIU_INT,aux,0,ctx->commrank,MPI_STATUS_IGNORE));
429
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41 PetscCallMPI(MPI_Recv(&sr->int1,1,MPIU_REAL,aux,0,ctx->commrank,MPI_STATUS_IGNORE));
430 }
431
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82 if (sr->inertia0==-1 && !(sr->dir>0 && ctx->subc->color==ctx->npart-1) && !(sr->dir<0 && ctx->subc->color==0)) {
432 sr->inertia0 = sr->inertia1; sr->int0 = sr->int1;
433 PetscCall(PetscMPIIntCast(ctx->subc->color-sr->dir,&aux));
434 PetscCallMPI(MPIU_Isend(&sr->inertia0,1,MPIU_INT,aux,0,ctx->commrank,&req));
435 PetscCallMPI(MPIU_Isend(&sr->int0,1,MPIU_REAL,aux,0,ctx->commrank,&req));
436 }
437 }
438
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97 if ((sr->dir>0 && ctx->subc->color<ctx->npart-1)||(sr->dir<0 && ctx->subc->color>0)) {
439
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112 PetscCallMPI(MPI_Bcast(&sr->inertia1,1,MPIU_INT,0,child));
440
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112 PetscCallMPI(MPI_Bcast(&sr->int1,1,MPIU_REAL,0,child));
441 41 } else sr_glob->inertia1 = sr->inertia1;
442 }
443
444 /* last process in eps comm computes inertia1 */
445
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197 if (ctx->npart==1 || ((sr->dir>0 && ctx->subc->color==ctx->npart-1) || (sr->dir<0 && ctx->subc->color==0))) {
446
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250 PetscCall(EPSSliceGetInertia(eps,sr->int1,&sr->inertia1,ctx->detect?&zeros:NULL));
447
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141 PetscCheck(zeros==0,((PetscObject)eps)->comm,PETSC_ERR_USER,"Found singular matrix for the transformed problem in an interval endpoint defined by user");
448
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141 if (!rank && sr->inertia0==-1) {
449 sr->inertia0 = sr->inertia1; sr->int0 = sr->int1;
450 PetscCall(PetscMPIIntCast(ctx->subc->color-sr->dir,&aux));
451 PetscCallMPI(MPIU_Isend(&sr->inertia0,1,MPIU_INT,aux,0,ctx->commrank,&req));
452 PetscCallMPI(MPIU_Isend(&sr->int0,1,MPIU_REAL,aux,0,ctx->commrank,&req));
453 }
454
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141 if (sr->hasEnd) {
455 131 sr->dir = -sr->dir; r = sr->int0; sr->int0 = sr->int1; sr->int1 = r;
456 131 i = sr->inertia0; sr->inertia0 = sr->inertia1; sr->inertia1 = i;
457 }
458 }
459
460 /* number of eigenvalues in interval */
461 197 sr->numEigs = (sr->dir)*(sr->inertia1 - sr->inertia0);
462
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197 if (ctx->npart>1) {
463 /* memory allocate for subinterval eigenpairs */
464
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97 PetscCall(EPSSliceAllocateSolution(eps,1));
465 }
466 197 dssz = eps->ncv+1;
467
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197 PetscCall(DSGetParallel(ctx->eps->ds,&ptype));
468
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197 PetscCall(DSSetParallel(eps->ds,ptype));
469
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197 PetscCall(DSGetMethod(ctx->eps->ds,&method));
470
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197 PetscCall(DSSetMethod(eps->ds,method));
471 }
472
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394 PetscCall(DSSetType(eps->ds,DSHEP));
473
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394 PetscCall(DSSetCompact(eps->ds,PETSC_TRUE));
474
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394 PetscCall(DSAllocate(eps->ds,dssz));
475 /* keep state of subcomm matrices to check that the user does not modify them */
476
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394 PetscCall(EPSGetOperators(eps,&A,&B));
477
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394 PetscCall(MatGetState(A,&ctx->Astate));
478
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394 PetscCall(PetscObjectGetId((PetscObject)A,&ctx->Aid));
479
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394 if (B) {
480
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314 PetscCall(MatGetState(B,&ctx->Bstate));
481
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314 PetscCall(PetscObjectGetId((PetscObject)B,&ctx->Bid));
482 } else {
483 80 ctx->Bstate=0;
484 80 ctx->Bid=0;
485 }
486
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68 PetscFunctionReturn(PETSC_SUCCESS);
487 }
488
489 65 static PetscErrorCode EPSSliceGatherEigenVectors(EPS eps)
490 {
491 65 Vec v,vg,v_loc;
492 65 IS is1,is2;
493 65 VecScatter vec_sc;
494 65 EPS_KRYLOVSCHUR *ctx=(EPS_KRYLOVSCHUR*)eps->data;
495 65 PetscInt nloc,m0,n0,i,si,idx,*idx1,*idx2,j;
496 65 PetscScalar *array;
497 65 EPS_SR sr_loc;
498 65 BV V_loc;
499
500
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65 PetscFunctionBegin;
501 65 sr_loc = ((EPS_KRYLOVSCHUR*)ctx->eps->data)->sr;
502 65 V_loc = sr_loc->V;
503
504 /* Gather parallel eigenvectors */
505
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65 PetscCall(BVGetColumn(eps->V,0,&v));
506
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65 PetscCall(VecGetOwnershipRange(v,&n0,&m0));
507
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65 PetscCall(BVRestoreColumn(eps->V,0,&v));
508
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65 PetscCall(BVGetColumn(ctx->eps->V,0,&v));
509
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65 PetscCall(VecGetLocalSize(v,&nloc));
510
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65 PetscCall(BVRestoreColumn(ctx->eps->V,0,&v));
511
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65 PetscCall(PetscMalloc2(m0-n0,&idx1,m0-n0,&idx2));
512
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65 PetscCall(VecCreateMPI(PetscObjectComm((PetscObject)eps),nloc,PETSC_DECIDE,&vg));
513 idx = -1;
514
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195 for (si=0;si<ctx->npart;si++) {
515 130 j = 0;
516
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85380 for (i=n0;i<m0;i++) {
517 85250 idx1[j] = i;
518 85250 idx2[j++] = i+eps->n*si;
519 }
520
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130 PetscCall(ISCreateGeneral(PetscObjectComm((PetscObject)eps),(m0-n0),idx1,PETSC_COPY_VALUES,&is1));
521
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130 PetscCall(ISCreateGeneral(PetscObjectComm((PetscObject)eps),(m0-n0),idx2,PETSC_COPY_VALUES,&is2));
522
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130 PetscCall(BVGetColumn(eps->V,0,&v));
523
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130 PetscCall(VecScatterCreate(v,is1,vg,is2,&vec_sc));
524
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130 PetscCall(BVRestoreColumn(eps->V,0,&v));
525
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130 PetscCall(ISDestroy(&is1));
526
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130 PetscCall(ISDestroy(&is2));
527
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2124 for (i=0;i<ctx->nconv_loc[si];i++) {
528
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1994 PetscCall(BVGetColumn(eps->V,++idx,&v));
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1994 if (ctx->subc->color==si) {
530
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980 PetscCall(BVGetColumn(V_loc,i,&v_loc));
531
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980 PetscCall(VecGetArray(v_loc,&array));
532
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980 PetscCall(VecPlaceArray(vg,array));
533 }
534
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1994 PetscCall(VecScatterBegin(vec_sc,vg,v,INSERT_VALUES,SCATTER_REVERSE));
535
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1994 PetscCall(VecScatterEnd(vec_sc,vg,v,INSERT_VALUES,SCATTER_REVERSE));
536
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1994 if (ctx->subc->color==si) {
537
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980 PetscCall(VecResetArray(vg));
538
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980 PetscCall(VecRestoreArray(v_loc,&array));
539
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980 PetscCall(BVRestoreColumn(V_loc,i,&v_loc));
540 }
541
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1994 PetscCall(BVRestoreColumn(eps->V,idx,&v));
542 }
543
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130 PetscCall(VecScatterDestroy(&vec_sc));
544 }
545
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65 PetscCall(PetscFree2(idx1,idx2));
546
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65 PetscCall(VecDestroy(&vg));
547
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10 PetscFunctionReturn(PETSC_SUCCESS);
548 }
549
550 /*
551 EPSComputeVectors_Slice - Recover Eigenvectors from subcomunicators
552 */
553 230 PetscErrorCode EPSComputeVectors_Slice(EPS eps)
554 {
555 230 EPS_KRYLOVSCHUR *ctx=(EPS_KRYLOVSCHUR*)eps->data;
556
557
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230 PetscFunctionBegin;
558
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230 if (ctx->global && ctx->npart>1) {
559
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65 PetscCall(EPSComputeVectors(ctx->eps));
560
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65 PetscCall(EPSSliceGatherEigenVectors(eps));
561 }
562
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40 PetscFunctionReturn(PETSC_SUCCESS);
563 }
564
565 197 static PetscErrorCode EPSSliceGetInertias(EPS eps,PetscInt *n,PetscReal **shifts,PetscInt **inertias)
566 {
567 197 EPS_KRYLOVSCHUR *ctx=(EPS_KRYLOVSCHUR*)eps->data;
568 197 PetscInt i=0,j,tmpi;
569 197 PetscReal v,tmpr;
570 197 EPS_shift s;
571
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197 PetscFunctionBegin;
573
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197 PetscCheck(eps->state,PetscObjectComm((PetscObject)eps),PETSC_ERR_ARG_WRONGSTATE,"Must call EPSSetUp() first");
574
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197 PetscCheck(ctx->sr,PetscObjectComm((PetscObject)eps),PETSC_ERR_ARG_WRONGSTATE,"Only available in interval computations, see EPSSetInterval()");
575
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197 if (!ctx->sr->s0) { /* EPSSolve not called yet */
576 *n = 2;
577 } else {
578 197 *n = 1;
579 197 s = ctx->sr->s0;
580
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518 while (s) {
581 321 (*n)++;
582 321 s = s->neighb[1];
583 }
584 }
585
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197 PetscCall(PetscMalloc1(*n,shifts));
586
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197 PetscCall(PetscMalloc1(*n,inertias));
587
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197 if (!ctx->sr->s0) { /* EPSSolve not called yet */
588 (*shifts)[0] = ctx->sr->int0;
589 (*shifts)[1] = ctx->sr->int1;
590 (*inertias)[0] = ctx->sr->inertia0;
591 (*inertias)[1] = ctx->sr->inertia1;
592 } else {
593 s = ctx->sr->s0;
594
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518 while (s) {
595 321 (*shifts)[i] = s->value;
596 321 (*inertias)[i++] = s->inertia;
597 321 s = s->neighb[1];
598 }
599 197 (*shifts)[i] = ctx->sr->int1;
600 197 (*inertias)[i] = ctx->sr->inertia1;
601 }
602 /* remove possible duplicate in last position */
603
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197 if ((*shifts)[(*n)-1]==(*shifts)[(*n)-2]) (*n)--;
604 /* sort result */
605
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689 for (i=0;i<*n;i++) {
606 492 v = (*shifts)[i];
607
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901 for (j=i+1;j<*n;j++) {
608
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409 if (v > (*shifts)[j]) {
609 333 SlepcSwap((*shifts)[i],(*shifts)[j],tmpr);
610 333 SlepcSwap((*inertias)[i],(*inertias)[j],tmpi);
611 333 v = (*shifts)[i];
612 }
613 }
614 }
615
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34 PetscFunctionReturn(PETSC_SUCCESS);
616 }
617
618 97 static PetscErrorCode EPSSliceGatherSolution(EPS eps)
619 {
620 97 PetscMPIInt rank,nproc,*disp,*ns_loc,aux;
621 97 EPS_KRYLOVSCHUR *ctx=(EPS_KRYLOVSCHUR*)eps->data;
622 97 PetscInt i,idx,j,*perm_loc,off=0,*inertias_loc,ns;
623 97 PetscScalar *eigr_loc;
624 97 EPS_SR sr_loc;
625 97 PetscReal *shifts_loc;
626 97 MPI_Comm child;
627
628
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97 PetscFunctionBegin;
629 97 eps->nconv = 0;
630
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291 for (i=0;i<ctx->npart;i++) eps->nconv += ctx->nconv_loc[i];
631 97 sr_loc = ((EPS_KRYLOVSCHUR*)ctx->eps->data)->sr;
632
633 /* Gather the shifts used and the inertias computed */
634
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97 PetscCall(EPSSliceGetInertias(ctx->eps,&ns,&shifts_loc,&inertias_loc));
635
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97 if (ctx->sr->dir>0 && shifts_loc[ns-1]==sr_loc->int1 && ctx->subc->color<ctx->npart-1) ns--;
636
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97 if (ctx->sr->dir<0 && shifts_loc[ns-1]==sr_loc->int0 && ctx->subc->color>0) {
637 ns--;
638 for (i=0;i<ns;i++) {
639 inertias_loc[i] = inertias_loc[i+1];
640 shifts_loc[i] = shifts_loc[i+1];
641 }
642 }
643
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97 PetscCall(PetscMalloc1(ctx->npart,&ns_loc));
644
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97 PetscCall(PetscSubcommGetChild(ctx->subc,&child));
645
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97 PetscCallMPI(MPI_Comm_rank(child,&rank));
646
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97 PetscCall(PetscMPIIntCast(ns,&aux));
647
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179 if (!rank) PetscCallMPI(MPI_Allgather(&aux,1,MPI_INT,ns_loc,1,MPI_INT,ctx->commrank));
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97 PetscCall(PetscMPIIntCast(ctx->npart,&aux));
649
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194 PetscCallMPI(MPI_Bcast(ns_loc,aux,MPI_INT,0,child));
650 97 ctx->nshifts = 0;
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291 for (i=0;i<ctx->npart;i++) ctx->nshifts += ns_loc[i];
652
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97 PetscCall(PetscFree(ctx->inertias));
653
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97 PetscCall(PetscFree(ctx->shifts));
654
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97 PetscCall(PetscMalloc1(ctx->nshifts,&ctx->inertias));
655
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97 PetscCall(PetscMalloc1(ctx->nshifts,&ctx->shifts));
656
657 /* Gather eigenvalues (same ranks have fully set of eigenvalues)*/
658 97 eigr_loc = sr_loc->eigr;
659 97 perm_loc = sr_loc->perm;
660
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97 PetscCallMPI(MPI_Comm_size(((PetscObject)eps)->comm,&nproc));
661
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97 PetscCall(PetscMalloc1(ctx->npart,&disp));
662 97 disp[0] = 0;
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194 for (i=1;i<ctx->npart;i++) disp[i] = disp[i-1]+ctx->nconv_loc[i-1];
664
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97 if (nproc%ctx->npart==0) { /* subcommunicators with the same size */
665
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52 PetscCall(PetscMPIIntCast(sr_loc->numEigs,&aux));
666
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104 PetscCallMPI(MPI_Allgatherv(eigr_loc,aux,MPIU_SCALAR,eps->eigr,ctx->nconv_loc,disp,MPIU_SCALAR,ctx->commrank)); /* eigenvalues */
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104 PetscCallMPI(MPI_Allgatherv(perm_loc,aux,MPIU_INT,eps->perm,ctx->nconv_loc,disp,MPIU_INT,ctx->commrank)); /* perm */
668
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104 for (i=1;i<ctx->npart;i++) disp[i] = disp[i-1]+ns_loc[i-1];
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52 PetscCall(PetscMPIIntCast(ns,&aux));
670
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104 PetscCallMPI(MPI_Allgatherv(shifts_loc,aux,MPIU_REAL,ctx->shifts,ns_loc,disp,MPIU_REAL,ctx->commrank)); /* shifts */
671
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104 PetscCallMPI(MPI_Allgatherv(inertias_loc,aux,MPIU_INT,ctx->inertias,ns_loc,disp,MPIU_INT,ctx->commrank)); /* inertias */
672
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52 PetscCallMPI(MPIU_Allreduce(&sr_loc->itsKs,&eps->its,1,MPIU_INT,MPI_SUM,ctx->commrank));
673 } else { /* subcommunicators with different size */
674
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45 if (!rank) {
675
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30 PetscCall(PetscMPIIntCast(sr_loc->numEigs,&aux));
676
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60 PetscCallMPI(MPI_Allgatherv(eigr_loc,aux,MPIU_SCALAR,eps->eigr,ctx->nconv_loc,disp,MPIU_SCALAR,ctx->commrank)); /* eigenvalues */
677
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60 PetscCallMPI(MPI_Allgatherv(perm_loc,aux,MPIU_INT,eps->perm,ctx->nconv_loc,disp,MPIU_INT,ctx->commrank)); /* perm */
678
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60 for (i=1;i<ctx->npart;i++) disp[i] = disp[i-1]+ns_loc[i-1];
679
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30 PetscCall(PetscMPIIntCast(ns,&aux));
680
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60 PetscCallMPI(MPI_Allgatherv(shifts_loc,aux,MPIU_REAL,ctx->shifts,ns_loc,disp,MPIU_REAL,ctx->commrank)); /* shifts */
681
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60 PetscCallMPI(MPI_Allgatherv(inertias_loc,aux,MPIU_INT,ctx->inertias,ns_loc,disp,MPIU_INT,ctx->commrank)); /* inertias */
682
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30 PetscCallMPI(MPIU_Allreduce(&sr_loc->itsKs,&eps->its,1,MPIU_INT,MPI_SUM,ctx->commrank));
683 }
684
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45 PetscCall(PetscMPIIntCast(eps->nconv,&aux));
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90 PetscCallMPI(MPI_Bcast(eps->eigr,aux,MPIU_SCALAR,0,child));
686
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90 PetscCallMPI(MPI_Bcast(eps->perm,aux,MPIU_INT,0,child));
687
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45 PetscCall(PetscMPIIntCast(ctx->nshifts,&aux));
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90 PetscCallMPI(MPI_Bcast(ctx->shifts,aux,MPIU_REAL,0,child));
689
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90 PetscCallMPI(MPI_Bcast(ctx->inertias,aux,MPIU_INT,0,child));
690
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90 PetscCallMPI(MPI_Bcast(&eps->its,1,MPIU_INT,0,child));
691 }
692 /* Update global array eps->perm */
693 97 idx = ctx->nconv_loc[0];
694
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194 for (i=1;i<ctx->npart;i++) {
695 97 off += ctx->nconv_loc[i-1];
696
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2305 for (j=0;j<ctx->nconv_loc[i];j++) eps->perm[idx++] += off;
697 }
698
699 /* Gather parallel eigenvectors */
700
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97 PetscCall(PetscFree(ns_loc));
701
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97 PetscCall(PetscFree(disp));
702
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97 PetscCall(PetscFree(shifts_loc));
703
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97 PetscCall(PetscFree(inertias_loc));
704
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14 PetscFunctionReturn(PETSC_SUCCESS);
705 }
706
707 /*
708 Fills the fields of a shift structure
709 */
710 321 static PetscErrorCode EPSCreateShift(EPS eps,PetscReal val,EPS_shift neighb0,EPS_shift neighb1)
711 {
712 321 EPS_shift s,*pending2;
713 321 PetscInt i;
714 321 EPS_SR sr;
715 321 EPS_KRYLOVSCHUR *ctx=(EPS_KRYLOVSCHUR*)eps->data;
716
717
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321 PetscFunctionBegin;
718 321 sr = ctx->sr;
719
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321 if ((neighb0 && val==neighb0->value) || (neighb1 && val==neighb1->value)) {
720 sr->nPend++;
721 PetscFunctionReturn(PETSC_SUCCESS);
722 }
723
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321 PetscCall(PetscNew(&s));
724 321 s->value = val;
725 321 s->neighb[0] = neighb0;
726
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321 if (neighb0) neighb0->neighb[1] = s;
727 321 s->neighb[1] = neighb1;
728
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321 if (neighb1) neighb1->neighb[0] = s;
729 321 s->comp[0] = PETSC_FALSE;
730 321 s->comp[1] = PETSC_FALSE;
731 321 s->index = -1;
732 321 s->neigs = 0;
733 321 s->nconv[0] = s->nconv[1] = 0;
734 321 s->nsch[0] = s->nsch[1]=0;
735 /* Inserts in the stack of pending shifts */
736 /* If needed, the array is resized */
737
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321 if (sr->nPend >= sr->maxPend) {
738 sr->maxPend *= 2;
739 PetscCall(PetscMalloc1(sr->maxPend,&pending2));
740 for (i=0;i<sr->nPend;i++) pending2[i] = sr->pending[i];
741 PetscCall(PetscFree(sr->pending));
742 sr->pending = pending2;
743 }
744 321 sr->pending[sr->nPend++]=s;
745
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321 PetscFunctionReturn(PETSC_SUCCESS);
746 }
747
748 /* Prepare for Rational Krylov update */
749 124 static PetscErrorCode EPSPrepareRational(EPS eps)
750 {
751 124 EPS_KRYLOVSCHUR *ctx=(EPS_KRYLOVSCHUR*)eps->data;
752 124 PetscInt dir,i,k,ld,nv;
753 124 PetscScalar *A;
754 124 EPS_SR sr = ctx->sr;
755 124 Vec v;
756
757
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124 PetscFunctionBegin;
758
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124 PetscCall(DSGetLeadingDimension(eps->ds,&ld));
759
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124 dir = (sr->sPres->neighb[0] == sr->sPrev)?1:-1;
760 124 dir*=sr->dir;
761 124 k = 0;
762
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3495 for (i=0;i<sr->nS;i++) {
763
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3445 if (dir*PetscRealPart(sr->S[i])>0.0) {
764 1704 sr->S[k] = sr->S[i];
765 1704 sr->S[sr->nS+k] = sr->S[sr->nS+i];
766
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1704 PetscCall(BVGetColumn(sr->Vnext,k,&v));
767
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1704 PetscCall(BVCopyVec(eps->V,eps->nconv+i,v));
768
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1704 PetscCall(BVRestoreColumn(sr->Vnext,k,&v));
769 1704 k++;
770
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1704 if (k>=sr->nS/2) break;
771 }
772 }
773 /* Copy to DS */
774
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124 PetscCall(DSSetCompact(eps->ds,PETSC_FALSE)); /* make sure DS_MAT_A is allocated */
775
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124 PetscCall(DSGetArray(eps->ds,DS_MAT_A,&A));
776
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124 PetscCall(PetscArrayzero(A,ld*ld));
777
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1828 for (i=0;i<k;i++) {
778 1704 A[i*(1+ld)] = sr->S[i];
779 1704 A[k+i*ld] = sr->S[sr->nS+i];
780 }
781 124 sr->nS = k;
782
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124 PetscCall(DSRestoreArray(eps->ds,DS_MAT_A,&A));
783
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124 PetscCall(DSGetDimensions(eps->ds,&nv,NULL,NULL,NULL));
784
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124 PetscCall(DSSetDimensions(eps->ds,nv,0,k));
785 /* Append u to V */
786
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124 PetscCall(BVGetColumn(sr->Vnext,sr->nS,&v));
787
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124 PetscCall(BVCopyVec(eps->V,sr->nv,v));
788
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124 PetscCall(BVRestoreColumn(sr->Vnext,sr->nS,&v));
789
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21 PetscFunctionReturn(PETSC_SUCCESS);
790 }
791
792 /* Provides next shift to be computed */
793 321 static PetscErrorCode EPSExtractShift(EPS eps)
794 {
795 321 PetscInt iner,zeros=0;
796 321 EPS_KRYLOVSCHUR *ctx=(EPS_KRYLOVSCHUR*)eps->data;
797 321 EPS_SR sr;
798 321 PetscReal newShift,diam,ptol;
799 321 EPS_shift sPres;
800
801
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321 PetscFunctionBegin;
802 321 sr = ctx->sr;
803
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321 if (sr->nPend > 0) {
804
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124 if (sr->sPres==sr->pending[sr->nPend-1]) {
805 eps->reason = EPS_CONVERGED_ITERATING;
806 eps->its = 0;
807 sr->nPend--;
808 sr->sPres->rep = PETSC_TRUE;
809 PetscFunctionReturn(PETSC_SUCCESS);
810 }
811 124 sr->sPrev = sr->sPres;
812 124 sr->sPres = sr->pending[--sr->nPend];
813 124 sPres = sr->sPres;
814
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198 PetscCall(EPSSliceGetInertia(eps,sPres->value,&iner,ctx->detect?&zeros:NULL));
815
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124 if (zeros) {
816 diam = PetscMin(PetscAbsReal(sPres->neighb[0]->value-sPres->value),PetscAbsReal(sPres->neighb[1]->value-sPres->value));
817 ptol = PetscMin(SLICE_PTOL,diam/2);
818 newShift = sPres->value*(1.0+ptol);
819 if (sr->dir*(sPres->neighb[0] && newShift-sPres->neighb[0]->value) < 0) newShift = (sPres->value+sPres->neighb[0]->value)/2;
820 else if (sPres->neighb[1] && sr->dir*(sPres->neighb[1]->value-newShift) < 0) newShift = (sPres->value+sPres->neighb[1]->value)/2;
821 PetscCall(EPSSliceGetInertia(eps,newShift,&iner,&zeros));
822 PetscCheck(zeros==0,((PetscObject)eps)->comm,PETSC_ERR_CONV_FAILED,"Inertia computation fails in %g",(double)newShift);
823 sPres->value = newShift;
824 }
825 124 sr->sPres->inertia = iner;
826 124 eps->target = sr->sPres->value;
827 124 eps->reason = EPS_CONVERGED_ITERATING;
828 124 eps->its = 0;
829 197 } else sr->sPres = NULL;
830
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55 PetscFunctionReturn(PETSC_SUCCESS);
831 }
832
833 /*
834 Symmetric KrylovSchur adapted to spectrum slicing:
835 Allows searching an specific amount of eigenvalues in the subintervals left and right.
836 Returns whether the search has succeeded
837 */
838 321 static PetscErrorCode EPSKrylovSchur_Slice(EPS eps)
839 {
840 321 EPS_KRYLOVSCHUR *ctx=(EPS_KRYLOVSCHUR*)eps->data;
841 321 PetscInt i,k,l,ld,nv,*iwork,j,count0,count1,iterCompl=0,n0,n1;
842 321 Mat U,Op,T;
843 321 PetscScalar *Q,*A;
844 321 PetscReal *a,*b,beta,lambda;
845 321 EPS_shift sPres;
846 321 PetscBool breakdown,complIterating,sch0,sch1;
847 321 EPS_SR sr = ctx->sr;
848
849
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321 PetscFunctionBegin;
850 /* Spectrum slicing data */
851 321 sPres = sr->sPres;
852 321 complIterating =PETSC_FALSE;
853 321 sch1 = sch0 = PETSC_TRUE;
854
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321 PetscCall(DSGetLeadingDimension(eps->ds,&ld));
855
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321 PetscCall(PetscMalloc1(2*ld,&iwork));
856 321 count0=0;count1=0; /* Found on both sides */
857
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321 if (!sPres->rep && sr->nS > 0 && (sPres->neighb[0] == sr->sPrev || sPres->neighb[1] == sr->sPrev)) {
858 /* Rational Krylov */
859
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124 PetscCall(DSTranslateRKS(eps->ds,sr->sPrev->value-sPres->value));
860
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124 PetscCall(DSGetDimensions(eps->ds,NULL,NULL,&l,NULL));
861
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124 PetscCall(DSSetDimensions(eps->ds,l+1,0,0));
862
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124 PetscCall(BVSetActiveColumns(eps->V,0,l+1));
863
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124 PetscCall(DSGetMat(eps->ds,DS_MAT_Q,&U));
864
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124 PetscCall(BVMultInPlace(eps->V,U,0,l+1));
865
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124 PetscCall(DSRestoreMat(eps->ds,DS_MAT_Q,&U));
866 } else {
867 /* Get the starting Lanczos vector */
868
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197 PetscCall(EPSGetStartVector(eps,0,NULL));
869 197 l = 0;
870 }
871 /* Restart loop */
872 1108 while (eps->reason == EPS_CONVERGED_ITERATING) {
873 787 eps->its++; sr->itsKs++;
874 /* Compute an nv-step Lanczos factorization */
875 787 nv = PetscMin(eps->nconv+eps->mpd,eps->ncv);
876
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787 PetscCall(DSSetDimensions(eps->ds,nv,eps->nconv,eps->nconv+l));
877
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787 PetscCall(DSGetMat(eps->ds,DS_MAT_T,&T));
878
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787 PetscCall(STGetOperator(eps->st,&Op));
879
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787 PetscCall(BVMatLanczos(eps->V,Op,T,eps->nconv+l,&nv,&beta,&breakdown));
880
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787 PetscCall(STRestoreOperator(eps->st,&Op));
881 787 sr->nv = nv;
882
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787 PetscCall(DSRestoreMat(eps->ds,DS_MAT_T,&T));
883
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787 PetscCall(DSSetDimensions(eps->ds,nv,eps->nconv,eps->nconv+l));
884
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787 if (l==0) PetscCall(DSSetState(eps->ds,DS_STATE_INTERMEDIATE));
885
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590 else PetscCall(DSSetState(eps->ds,DS_STATE_RAW));
886
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787 PetscCall(BVSetActiveColumns(eps->V,eps->nconv,nv));
887
888 /* Solve projected problem and compute residual norm estimates */
889
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787 if (eps->its == 1 && l > 0) { /* After rational update, DS_MAT_A is available */
890
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124 PetscCall(DSGetArray(eps->ds,DS_MAT_A,&A));
891
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124 PetscCall(DSGetArrayReal(eps->ds,DS_MAT_T,&a));
892 124 b = a + ld;
893 124 k = eps->nconv+l;
894 124 A[k*ld+k-1] = A[(k-1)*ld+k];
895 124 A[k*ld+k] = a[k];
896
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6976 for (j=k+1; j< nv; j++) {
897 6852 A[j*ld+j] = a[j];
898 6852 A[j*ld+j-1] = b[j-1] ;
899 6852 A[(j-1)*ld+j] = b[j-1];
900 }
901
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124 PetscCall(DSRestoreArray(eps->ds,DS_MAT_A,&A));
902
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124 PetscCall(DSRestoreArrayReal(eps->ds,DS_MAT_T,&a));
903
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124 PetscCall(DSSolve(eps->ds,eps->eigr,NULL));
904
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124 PetscCall(DSSort(eps->ds,eps->eigr,NULL,NULL,NULL,NULL));
905
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124 PetscCall(DSSetCompact(eps->ds,PETSC_TRUE));
906 } else { /* Restart */
907
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663 PetscCall(DSSolve(eps->ds,eps->eigr,NULL));
908
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663 PetscCall(DSSort(eps->ds,eps->eigr,NULL,NULL,NULL,NULL));
909 }
910
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787 PetscCall(DSSynchronize(eps->ds,eps->eigr,NULL));
911
912 /* Residual */
913
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787 PetscCall(EPSKrylovConvergence(eps,PETSC_TRUE,eps->nconv,nv-eps->nconv,beta,0.0,1.0,&k));
914 /* Checking values obtained for completing */
915
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27660 for (i=0;i<k;i++) {
916 26873 sr->back[i]=eps->eigr[i];
917 }
918
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787 PetscCall(STBackTransform(eps->st,k,sr->back,eps->eigi));
919 count0=count1=0;
920
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27660 for (i=0;i<k;i++) {
921 26873 lambda = PetscRealPart(sr->back[i]);
922
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26873 if ((sr->dir*(sPres->value - lambda) > 0) && (sr->dir*(lambda - sPres->ext[0]) > 0)) count0++;
923
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26873 if ((sr->dir*(lambda - sPres->value) > 0) && (sr->dir*(sPres->ext[1] - lambda) > 0)) count1++;
924 }
925
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787 if (k>eps->nev && eps->ncv-k<5) eps->reason = EPS_CONVERGED_TOL;
926 else {
927 /* Checks completion */
928
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787 if ((!sch0||count0 >= sPres->nsch[0]) && (!sch1 ||count1 >= sPres->nsch[1])) {
929 197 eps->reason = EPS_CONVERGED_TOL;
930 } else {
931
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590 if (!complIterating && eps->its >= eps->max_it) eps->reason = EPS_DIVERGED_ITS;
932
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590 if (complIterating) {
933
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153 if (--iterCompl <= 0) eps->reason = EPS_DIVERGED_ITS;
934
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437 } else if (k >= eps->nev) {
935 142 n0 = sPres->nsch[0]-count0;
936 142 n1 = sPres->nsch[1]-count1;
937
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142 if (sr->iterCompl>0 && ((n0>0 && n0<= sr->nMAXCompl)||(n1>0&&n1<=sr->nMAXCompl))) {
938 /* Iterating for completion*/
939 18 complIterating = PETSC_TRUE;
940
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18 if (n0 >sr->nMAXCompl)sch0 = PETSC_FALSE;
941
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18 if (n1 >sr->nMAXCompl)sch1 = PETSC_FALSE;
942 iterCompl = sr->iterCompl;
943 124 } else eps->reason = EPS_CONVERGED_TOL;
944 }
945 }
946 }
947 /* Update l */
948
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787 if (eps->reason == EPS_CONVERGED_ITERATING) l = PetscMax(1,(PetscInt)((nv-k)*ctx->keep));
949 321 else l = nv-k;
950
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787 if (breakdown) l=0;
951
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787 if (!ctx->lock && l>0 && eps->reason == EPS_CONVERGED_ITERATING) { l += k; k = 0; } /* non-locking variant: reset no. of converged pairs */
952
953
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787 if (eps->reason == EPS_CONVERGED_ITERATING) {
954
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466 if (breakdown) {
955 /* Start a new Lanczos factorization */
956 PetscCall(PetscInfo(eps,"Breakdown in Krylov-Schur method (it=%" PetscInt_FMT " norm=%g)\n",eps->its,(double)beta));
957 PetscCall(EPSGetStartVector(eps,k,&breakdown));
958 if (breakdown) {
959 eps->reason = EPS_DIVERGED_BREAKDOWN;
960 PetscCall(PetscInfo(eps,"Unable to generate more start vectors\n"));
961 }
962 } else {
963 /* Prepare the Rayleigh quotient for restart */
964
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466 PetscCall(DSGetArrayReal(eps->ds,DS_MAT_T,&a));
965
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466 PetscCall(DSGetArray(eps->ds,DS_MAT_Q,&Q));
966 466 b = a + ld;
967
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15558 for (i=k;i<k+l;i++) {
968 15092 a[i] = PetscRealPart(eps->eigr[i]);
969 15092 b[i] = PetscRealPart(Q[nv-1+i*ld]*beta);
970 }
971
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466 PetscCall(DSRestoreArrayReal(eps->ds,DS_MAT_T,&a));
972
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466 PetscCall(DSRestoreArray(eps->ds,DS_MAT_Q,&Q));
973 }
974 }
975 /* Update the corresponding vectors V(:,idx) = V*Q(:,idx) */
976
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787 PetscCall(DSGetMat(eps->ds,DS_MAT_Q,&U));
977
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787 PetscCall(BVMultInPlace(eps->V,U,eps->nconv,k+l));
978
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787 PetscCall(DSRestoreMat(eps->ds,DS_MAT_Q,&U));
979
980 /* Normalize u and append it to V */
981
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787 if (eps->reason == EPS_CONVERGED_ITERATING && !breakdown) PetscCall(BVCopyColumn(eps->V,nv,k+l));
982 787 eps->nconv = k;
983
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787 if (eps->reason != EPS_CONVERGED_ITERATING) {
984 /* Store approximated values for next shift */
985
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321 PetscCall(DSGetArray(eps->ds,DS_MAT_Q,&Q));
986 321 sr->nS = l;
987
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11971 for (i=0;i<l;i++) {
988 11650 sr->S[i] = eps->eigr[i+k];/* Diagonal elements */
989 11650 sr->S[i+l] = Q[nv-1+(i+k)*ld]*beta; /* Out of diagonal elements */
990 }
991
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1429 PetscCall(DSRestoreArray(eps->ds,DS_MAT_Q,&Q));
992 }
993 }
994 /* Check for completion */
995
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11871 for (i=0;i< eps->nconv; i++) {
996
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11550 if (sr->dir*PetscRealPart(eps->eigr[i])>0) sPres->nconv[1]++;
997 5880 else sPres->nconv[0]++;
998 }
999 321 sPres->comp[0] = PetscNot(count0 < sPres->nsch[0]);
1000 321 sPres->comp[1] = PetscNot(count1 < sPres->nsch[1]);
1001
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445 PetscCall(PetscInfo(eps,"Lanczos: %" PetscInt_FMT " evals in [%g,%g]%s and %" PetscInt_FMT " evals in [%g,%g]%s\n",count0,(double)(sr->dir==1?sPres->ext[0]:sPres->value),(double)(sr->dir==1?sPres->value:sPres->ext[0]),sPres->comp[0]?"*":"",count1,(double)(sr->dir==1?sPres->value:sPres->ext[1]),(double)(sr->dir==1?sPres->ext[1]:sPres->value),sPres->comp[1]?"*":""));
1002
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321 PetscCheck(count0<=sPres->nsch[0] && count1<=sPres->nsch[1],PetscObjectComm((PetscObject)eps),PETSC_ERR_PLIB,"Mismatch between number of values found and information from inertia%s",ctx->detect?"":", consider using EPSKrylovSchurSetDetectZeros()");
1003
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321 PetscCall(PetscFree(iwork));
1004
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55 PetscFunctionReturn(PETSC_SUCCESS);
1005 }
1006
1007 /*
1008 Obtains value of subsequent shift
1009 */
1010 124 static PetscErrorCode EPSGetNewShiftValue(EPS eps,PetscInt side,PetscReal *newS)
1011 {
1012 124 PetscReal lambda,d_prev;
1013 124 PetscInt i,idxP;
1014 124 EPS_SR sr;
1015 124 EPS_shift sPres,s;
1016 124 EPS_KRYLOVSCHUR *ctx=(EPS_KRYLOVSCHUR*)eps->data;
1017
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124 PetscFunctionBegin;
1019 124 sr = ctx->sr;
1020 124 sPres = sr->sPres;
1021
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124 if (sPres->neighb[side]) {
1022 /* Completing a previous interval */
1023 12 *newS = (sPres->value + sPres->neighb[side]->value)/2;
1024
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12 if (PetscAbsReal(sPres->value - *newS)/PetscAbsReal(sPres->value)<=100*PETSC_SQRT_MACHINE_EPSILON) *newS = sPres->value;
1025 } else { /* (Only for side=1). Creating a new interval. */
1026
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112 if (sPres->neigs==0) {/* No value has been accepted*/
1027 if (sPres->neighb[0]) {
1028 /* Multiplying by 10 the previous distance */
1029 *newS = sPres->value + 10*sr->dir*PetscAbsReal(sPres->value - sPres->neighb[0]->value);
1030 sr->nleap++;
1031 /* Stops when the interval is open and no values are found in the last 5 shifts (there might be infinite eigenvalues) */
1032 PetscCheck(sr->hasEnd || sr->nleap<=5,PetscObjectComm((PetscObject)eps),PETSC_ERR_PLIB,"Unable to compute the wanted eigenvalues with open interval");
1033 } else { /* First shift */
1034 PetscCheck(eps->nconv!=0,PetscObjectComm((PetscObject)eps),PETSC_ERR_PLIB,"First shift renders no information");
1035 /* Unaccepted values give information for next shift */
1036 idxP=0;/* Number of values left from shift */
1037 for (i=0;i<eps->nconv;i++) {
1038 lambda = PetscRealPart(eps->eigr[i]);
1039 if (sr->dir*(lambda - sPres->value) <0) idxP++;
1040 else break;
1041 }
1042 /* Avoiding subtraction of eigenvalues (might be the same).*/
1043 if (idxP>0) {
1044 d_prev = PetscAbsReal(sPres->value - PetscRealPart(eps->eigr[0]))/(idxP+0.3);
1045 } else {
1046 d_prev = PetscAbsReal(sPres->value - PetscRealPart(eps->eigr[eps->nconv-1]))/(eps->nconv+0.3);
1047 }
1048 *newS = sPres->value + (sr->dir*d_prev*eps->nev)/2;
1049 }
1050 } else { /* Accepted values found */
1051 112 sr->nleap = 0;
1052 /* Average distance of values in previous subinterval */
1053 112 s = sPres->neighb[0];
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112 while (s && PetscAbs(s->inertia - sPres->inertia)==0) {
1055 s = s->neighb[0];/* Looking for previous shifts with eigenvalues within */
1056 }
1057
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112 if (s) {
1058 d_prev = PetscAbsReal((sPres->value - s->value)/(sPres->inertia - s->inertia));
1059 } else { /* First shift. Average distance obtained with values in this shift */
1060 /* first shift might be too far from first wanted eigenvalue (no values found outside the interval)*/
1061
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112 if (sr->dir*(PetscRealPart(sr->eigr[0])-sPres->value)>0 && PetscAbsReal((PetscRealPart(sr->eigr[sr->indexEig-1]) - PetscRealPart(sr->eigr[0]))/PetscRealPart(sr->eigr[0])) > PetscSqrtReal(eps->tol)) {
1062 112 d_prev = PetscAbsReal((PetscRealPart(sr->eigr[sr->indexEig-1]) - PetscRealPart(sr->eigr[0])))/(sPres->neigs+0.3);
1063 } else {
1064 d_prev = PetscAbsReal(PetscRealPart(sr->eigr[sr->indexEig-1]) - sPres->value)/(sPres->neigs+0.3);
1065 }
1066 }
1067 /* Average distance is used for next shift by adding it to value on the right or to shift */
1068
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112 if (sr->dir*(PetscRealPart(sr->eigr[sPres->index + sPres->neigs -1]) - sPres->value)>0) {
1069 112 *newS = PetscRealPart(sr->eigr[sPres->index + sPres->neigs -1])+ (sr->dir*d_prev*eps->nev)/2;
1070 } else { /* Last accepted value is on the left of shift. Adding to shift */
1071 *newS = sPres->value + (sr->dir*d_prev*eps->nev)/2;
1072 }
1073 }
1074 /* End of interval can not be surpassed */
1075
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112 if (sr->dir*(sr->int1 - *newS) < 0) *newS = sr->int1;
1076 }/* of neighb[side]==null */
1077
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21 PetscFunctionReturn(PETSC_SUCCESS);
1078 }
1079
1080 /*
1081 Function for sorting an array of real values
1082 */
1083 642 static PetscErrorCode sortRealEigenvalues(PetscScalar *r,PetscInt *perm,PetscInt nr,PetscBool prev,PetscInt dir)
1084 {
1085 642 PetscReal re;
1086 642 PetscInt i,j,tmp;
1087
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642 PetscFunctionBegin;
1089
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12458 if (!prev) for (i=0;i<nr;i++) perm[i] = i;
1090 /* Insertion sort */
1091
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19628 for (i=1;i<nr;i++) {
1092 18986 re = PetscRealPart(r[perm[i]]);
1093 18986 j = i-1;
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127064 while (j>=0 && dir*(re - PetscRealPart(r[perm[j]])) <= 0) {
1095 108078 tmp = perm[j]; perm[j] = perm[j+1]; perm[j+1] = tmp; j--;
1096 }
1097 }
1098
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642 PetscFunctionReturn(PETSC_SUCCESS);
1099 }
1100
1101 /* Stores the pairs obtained since the last shift in the global arrays */
1102 321 static PetscErrorCode EPSStoreEigenpairs(EPS eps)
1103 {
1104 321 EPS_KRYLOVSCHUR *ctx=(EPS_KRYLOVSCHUR*)eps->data;
1105 321 PetscReal lambda,err,norm;
1106 321 PetscInt i,count;
1107 321 PetscBool iscayley;
1108 321 EPS_SR sr = ctx->sr;
1109 321 EPS_shift sPres;
1110 321 Vec v,w;
1111
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321 PetscFunctionBegin;
1113 321 sPres = sr->sPres;
1114 321 sPres->index = sr->indexEig;
1115 321 count = sr->indexEig;
1116 /* Back-transform */
1117
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321 PetscCall(STBackTransform(eps->st,eps->nconv,eps->eigr,eps->eigi));
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321 PetscCall(PetscObjectTypeCompare((PetscObject)eps->st,STCAYLEY,&iscayley));
1119 /* Sort eigenvalues */
1120
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321 PetscCall(sortRealEigenvalues(eps->eigr,eps->perm,eps->nconv,PETSC_FALSE,sr->dir));
1121 /* Values stored in global array */
1122
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11871 for (i=0;i<eps->nconv;i++) {
1123 11550 lambda = PetscRealPart(eps->eigr[eps->perm[i]]);
1124 11550 err = eps->errest[eps->perm[i]];
1125
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11550 if (sr->dir*(lambda - sPres->ext[0]) > 0 && (sr->dir)*(sPres->ext[1] - lambda) > 0) {/* Valid value */
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5478 PetscCheck(count<sr->numEigs,PetscObjectComm((PetscObject)eps),PETSC_ERR_PLIB,"Unexpected error in Spectrum Slicing");
1128 5478 sr->eigr[count] = lambda;
1129 5478 sr->errest[count] = err;
1130 /* Explicit purification */
1131
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5478 PetscCall(BVGetColumn(eps->V,eps->perm[i],&w));
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5478 if (eps->purify) {
1133
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4708 PetscCall(BVGetColumn(sr->V,count,&v));
1134
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4708 PetscCall(STApply(eps->st,w,v));
1135
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4708 PetscCall(BVRestoreColumn(sr->V,count,&v));
1136
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770 } else PetscCall(BVInsertVec(sr->V,count,w));
1137
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5478 PetscCall(BVRestoreColumn(eps->V,eps->perm[i],&w));
1138
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5478 PetscCall(BVNormColumn(sr->V,count,NORM_2,&norm));
1139
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5478 PetscCall(BVScaleColumn(sr->V,count,1.0/norm));
1140 5478 count++;
1141 }
1142 }
1143 321 sPres->neigs = count - sr->indexEig;
1144 321 sr->indexEig = count;
1145 /* Global ordering array updating */
1146
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321 PetscCall(sortRealEigenvalues(sr->eigr,sr->perm,count,PETSC_TRUE,sr->dir));
1147
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55 PetscFunctionReturn(PETSC_SUCCESS);
1148 }
1149
1150 321 static PetscErrorCode EPSLookForDeflation(EPS eps)
1151 {
1152 321 PetscReal val;
1153 321 PetscInt i,count0=0,count1=0;
1154 321 EPS_shift sPres;
1155 321 PetscInt ini,fin,k,idx0,idx1;
1156 321 EPS_SR sr;
1157 321 Vec v;
1158 321 EPS_KRYLOVSCHUR *ctx=(EPS_KRYLOVSCHUR*)eps->data;
1159
1160
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321 PetscFunctionBegin;
1161 321 sr = ctx->sr;
1162 321 sPres = sr->sPres;
1163
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321 if (sPres->neighb[0]) ini = (sr->dir)*(sPres->neighb[0]->inertia - sr->inertia0);
1165 else ini = 0;
1166 321 fin = sr->indexEig;
1167 /* Selection of ends for searching new values */
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321 if (!sPres->neighb[0]) sPres->ext[0] = sr->int0;/* First shift */
1169 124 else sPres->ext[0] = sPres->neighb[0]->value;
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321 if (!sPres->neighb[1]) {
1171
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309 if (sr->hasEnd) sPres->ext[1] = sr->int1;
1172
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40 else sPres->ext[1] = (sr->dir > 0)?PETSC_MAX_REAL:PETSC_MIN_REAL;
1173 12 } else sPres->ext[1] = sPres->neighb[1]->value;
1174 /* Selection of values between right and left ends */
1175
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2785 for (i=ini;i<fin;i++) {
1176 2476 val=PetscRealPart(sr->eigr[sr->perm[i]]);
1177 /* Values to the right of left shift */
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2476 if (sr->dir*(val - sPres->ext[1]) < 0) {
1179
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2464 if (sr->dir*(val - sPres->value) < 0) count0++;
1180 144 else count1++;
1181 } else break;
1182 }
1183 /* The number of values on each side are found */
1184
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321 if (sPres->neighb[0]) {
1185 124 sPres->nsch[0] = (sr->dir)*(sPres->inertia - sPres->neighb[0]->inertia)-count0;
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124 PetscCheck(sPres->nsch[0]>=0,PetscObjectComm((PetscObject)eps),PETSC_ERR_PLIB,"Mismatch between number of values found and information from inertia%s",ctx->detect?"":", consider using EPSKrylovSchurSetDetectZeros()");
1187 197 } else sPres->nsch[0] = 0;
1188
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321 if (sPres->neighb[1]) {
1190 12 sPres->nsch[1] = (sr->dir)*(sPres->neighb[1]->inertia - sPres->inertia) - count1;
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12 PetscCheck(sPres->nsch[1]>=0,PetscObjectComm((PetscObject)eps),PETSC_ERR_PLIB,"Mismatch between number of values found and information from inertia%s",ctx->detect?"":", consider using EPSKrylovSchurSetDetectZeros()");
1192 309 } else sPres->nsch[1] = (sr->dir)*(sr->inertia1 - sPres->inertia);
1193
1194 /* Completing vector of indexes for deflation */
1195 321 idx0 = ini;
1196 321 idx1 = ini+count0+count1;
1197 321 k=0;
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2785 for (i=idx0;i<idx1;i++) sr->idxDef[k++]=sr->perm[i];
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321 PetscCall(BVDuplicateResize(eps->V,k+eps->ncv+1,&sr->Vnext));
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321 PetscCall(BVSetNumConstraints(sr->Vnext,k));
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2785 for (i=0;i<k;i++) {
1202
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2464 PetscCall(BVGetColumn(sr->Vnext,-i-1,&v));
1203
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2464 PetscCall(BVCopyVec(sr->V,sr->idxDef[i],v));
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2464 PetscCall(BVRestoreColumn(sr->Vnext,-i-1,&v));
1205 }
1206
1207 /* For rational Krylov */
1208
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321 if (!sr->sPres->rep && sr->nS>0 && (sr->sPrev == sr->sPres->neighb[0] || sr->sPrev == sr->sPres->neighb[1])) PetscCall(EPSPrepareRational(eps));
1209 321 eps->nconv = 0;
1210 /* Get rid of temporary Vnext */
1211
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321 PetscCall(BVDestroy(&eps->V));
1212 321 eps->V = sr->Vnext;
1213 321 sr->Vnext = NULL;
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321 PetscFunctionReturn(PETSC_SUCCESS);
1215 }
1216
1217 394 PetscErrorCode EPSSolve_KrylovSchur_Slice(EPS eps)
1218 {
1219 394 PetscInt i,lds,ti;
1220 394 PetscReal newS;
1221 394 EPS_KRYLOVSCHUR *ctx=(EPS_KRYLOVSCHUR*)eps->data;
1222 394 EPS_SR sr=ctx->sr;
1223 394 Mat A,B=NULL;
1224 394 PetscObjectState Astate,Bstate=0;
1225 394 PetscObjectId Aid,Bid=0;
1226
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394 PetscFunctionBegin;
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394 PetscCall(PetscCitationsRegister(citation,&cited));
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394 if (ctx->global) {
1230
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197 PetscCall(EPSSolve_KrylovSchur_Slice(ctx->eps));
1231 197 ctx->eps->state = EPS_STATE_SOLVED;
1232 197 eps->reason = EPS_CONVERGED_TOL;
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197 if (ctx->npart>1) {
1234 /* Gather solution from subsolvers */
1235
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97 PetscCall(EPSSliceGatherSolution(eps));
1236 } else {
1237 100 eps->nconv = sr->numEigs;
1238 100 eps->its = ctx->eps->its;
1239
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100 PetscCall(PetscFree(ctx->inertias));
1240
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100 PetscCall(PetscFree(ctx->shifts));
1241
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100 PetscCall(EPSSliceGetInertias(ctx->eps,&ctx->nshifts,&ctx->shifts,&ctx->inertias));
1242 }
1243 } else {
1244
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197 if (ctx->npart==1) {
1245 100 sr->eigr = ctx->eps->eigr;
1246 100 sr->eigi = ctx->eps->eigi;
1247 100 sr->perm = ctx->eps->perm;
1248 100 sr->errest = ctx->eps->errest;
1249 100 sr->V = ctx->eps->V;
1250 }
1251 /* Check that the user did not modify subcomm matrices */
1252
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197 PetscCall(EPSGetOperators(eps,&A,&B));
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197 PetscCall(MatGetState(A,&Astate));
1254
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197 PetscCall(PetscObjectGetId((PetscObject)A,&Aid));
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197 if (B) {
1256
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157 PetscCall(MatGetState(B,&Bstate));
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157 PetscCall(PetscObjectGetId((PetscObject)B,&Bid));
1258 }
1259
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197 PetscCheck(Astate==ctx->Astate && (!B || Bstate==ctx->Bstate) && Aid==ctx->Aid && (!B || Bid==ctx->Bid),PETSC_COMM_SELF,PETSC_ERR_ARG_WRONGSTATE,"Subcomm matrices have been modified by user");
1260 /* Only with eigenvalues present in the interval ...*/
1261
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197 if (sr->numEigs==0) {
1262 eps->reason = EPS_CONVERGED_TOL;
1263 PetscFunctionReturn(PETSC_SUCCESS);
1264 }
1265 /* Array of pending shifts */
1266 197 sr->maxPend = 100; /* Initial size */
1267 197 sr->nPend = 0;
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197 PetscCall(PetscMalloc1(sr->maxPend,&sr->pending));
1269
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197 PetscCall(EPSCreateShift(eps,sr->int0,NULL,NULL));
1270 /* extract first shift */
1271 197 sr->sPrev = NULL;
1272 197 sr->sPres = sr->pending[--sr->nPend];
1273 197 sr->sPres->inertia = sr->inertia0;
1274 197 eps->target = sr->sPres->value;
1275 197 sr->s0 = sr->sPres;
1276 197 sr->indexEig = 0;
1277 /* Memory reservation for auxiliary variables */
1278 197 lds = PetscMin(eps->mpd,eps->ncv);
1279
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197 PetscCall(PetscCalloc1(lds*lds,&sr->S));
1280
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197 PetscCall(PetscMalloc1(eps->ncv,&sr->back));
1281
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5675 for (i=0;i<sr->numEigs;i++) {
1282 5478 sr->eigr[i] = 0.0;
1283 5478 sr->eigi[i] = 0.0;
1284 5478 sr->errest[i] = 0.0;
1285 5478 sr->perm[i] = i;
1286 }
1287 /* Vectors for deflation */
1288
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197 PetscCall(PetscMalloc1(sr->numEigs,&sr->idxDef));
1289 197 sr->indexEig = 0;
1290 /* Main loop */
1291 197 while (sr->sPres) {
1292 /* Search for deflation */
1293
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321 PetscCall(EPSLookForDeflation(eps));
1294 /* KrylovSchur */
1295
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321 PetscCall(EPSKrylovSchur_Slice(eps));
1296
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321 PetscCall(EPSStoreEigenpairs(eps));
1298 /* Select new shift */
1299
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321 if (!sr->sPres->comp[1]) {
1300
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116 PetscCall(EPSGetNewShiftValue(eps,1,&newS));
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116 PetscCall(EPSCreateShift(eps,newS,sr->sPres,sr->sPres->neighb[1]));
1302 }
1303
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321 if (!sr->sPres->comp[0]) {
1304 /* Completing earlier interval */
1305
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8 PetscCall(EPSGetNewShiftValue(eps,0,&newS));
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8 PetscCall(EPSCreateShift(eps,newS,sr->sPres->neighb[0],sr->sPres));
1307 }
1308 /* Preparing for a new search of values */
1309
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518 PetscCall(EPSExtractShift(eps));
1310 }
1311
1312 /* Updating eps values prior to exit */
1313
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197 PetscCall(PetscFree(sr->S));
1314
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197 PetscCall(PetscFree(sr->idxDef));
1315
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197 PetscCall(PetscFree(sr->pending));
1316
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197 PetscCall(PetscFree(sr->back));
1317
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197 PetscCall(BVDuplicateResize(eps->V,eps->ncv+1,&sr->Vnext));
1318
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197 PetscCall(BVSetNumConstraints(sr->Vnext,0));
1319
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197 PetscCall(BVDestroy(&eps->V));
1320 197 eps->V = sr->Vnext;
1321 197 eps->nconv = sr->indexEig;
1322 197 eps->reason = EPS_CONVERGED_TOL;
1323 197 eps->its = sr->itsKs;
1324 197 eps->nds = 0;
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197 if (sr->dir<0) {
1326
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2299 for (i=0;i<eps->nconv/2;i++) {
1327 2158 ti = sr->perm[i]; sr->perm[i] = sr->perm[eps->nconv-1-i]; sr->perm[eps->nconv-1-i] = ti;
1328 }
1329 }
1330 }
1331
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68 PetscFunctionReturn(PETSC_SUCCESS);
1332 }
1333