GCC Code Coverage Report


Directory: ./
File: src/sys/classes/st/interface/stsles.c
Date: 2025-11-19 04:19:03
Exec Total Coverage
Lines: 226 228 99.1%
Functions: 14 14 100.0%
Branches: 729 1704 42.8%

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 ST interface routines related to the KSP object associated with it
12 */
13
14 #include <slepc/private/stimpl.h> /*I "slepcst.h" I*/
15
16 /*
17 This is used to set a default type for the KSP and PC objects.
18 It is called at STSetFromOptions (before KSPSetFromOptions)
19 and also at STSetUp (in case STSetFromOptions was not called).
20 */
21 12474 PetscErrorCode STSetDefaultKSP(ST st)
22 {
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12474 PetscFunctionBegin;
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12474 PetscValidHeaderSpecific(st,ST_CLASSID,1);
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12474 PetscValidType(st,1);
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12474 if (!st->ksp) PetscCall(STGetKSP(st,&st->ksp));
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12474 PetscTryTypeMethod(st,setdefaultksp);
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2444 PetscFunctionReturn(PETSC_SUCCESS);
29 }
30
31 /*
32 This is done by all ST types except PRECOND.
33 The default is an LU direct solver, or GMRES+Jacobi if matmode=shell.
34 */
35 9623 PetscErrorCode STSetDefaultKSP_Default(ST st)
36 {
37 9623 PC pc;
38 9623 PCType pctype;
39 9623 KSPType ksptype;
40
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9623 PetscFunctionBegin;
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9623 PetscCall(KSPGetPC(st->ksp,&pc));
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9623 PetscCall(KSPGetType(st->ksp,&ksptype));
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9623 PetscCall(PCGetType(pc,&pctype));
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9623 if (!pctype && !ksptype) {
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6656 if (st->Pmat || st->Psplit) {
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195 PetscCall(KSPSetType(st->ksp,KSPBCGS));
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195 PetscCall(PCSetType(pc,PCBJACOBI));
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6461 } else if (st->matmode == ST_MATMODE_SHELL) {
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566 PetscCall(KSPSetType(st->ksp,KSPGMRES));
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566 PetscCall(PCSetType(pc,PCJACOBI));
52 } else {
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5895 PetscCall(KSPSetType(st->ksp,KSPPREONLY));
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11460 PetscCall(PCSetType(pc,st->asymm?PCCHOLESKY:PCLU));
55 }
56 }
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9623 PetscCall(KSPSetErrorIfNotConverged(st->ksp,PETSC_TRUE));
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1853 PetscFunctionReturn(PETSC_SUCCESS);
59 }
60
61 /*@
62 STMatMult - Computes the matrix-vector product $y = T_k x$, where $T_k$ is
63 the $k$-th (transformed) matrix of the spectral transformation.
64
65 Neighbor-wise Collective
66
67 Input Parameters:
68 + st - the spectral transformation context
69 . k - index of matrix to use
70 - x - the vector to be multiplied
71
72 Output Parameter:
73 . y - the result
74
75 Level: developer
76
77 .seealso: [](ch:st), `STMatMultTranspose()`, `STMatMultHermitianTranspose()`, `STGetMatrixTransformed()`
78 @*/
79 588920 PetscErrorCode STMatMult(ST st,PetscInt k,Vec x,Vec y)
80 {
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588920 PetscFunctionBegin;
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588920 PetscValidHeaderSpecific(st,ST_CLASSID,1);
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588920 PetscValidLogicalCollectiveInt(st,k,2);
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588920 PetscValidHeaderSpecific(x,VEC_CLASSID,3);
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588920 PetscValidHeaderSpecific(y,VEC_CLASSID,4);
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588920 STCheckMatrices(st,1);
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588920 PetscCheck(k>=0 && k<PetscMax(2,st->nmat),PetscObjectComm((PetscObject)st),PETSC_ERR_ARG_OUTOFRANGE,"k must be between 0 and %" PetscInt_FMT,st->nmat);
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588920 PetscCheck(x!=y,PetscObjectComm((PetscObject)st),PETSC_ERR_ARG_IDN,"x and y must be different vectors");
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588920 PetscCall(VecSetErrorIfLocked(y,3));
90
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588920 if (st->state!=ST_STATE_SETUP) PetscCall(STSetUp(st));
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588920 PetscCall(VecLockReadPush(x));
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588920 PetscCall(PetscLogEventBegin(ST_MatMult,st,x,y,0));
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588920 if (!st->T[k]) PetscCall(VecCopy(x,y)); /* T[k]=NULL means identity matrix */
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588920 else PetscCall(MatMult(st->T[k],x,y));
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588920 PetscCall(PetscLogEventEnd(ST_MatMult,st,x,y,0));
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588920 PetscCall(VecLockReadPop(x));
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113674 PetscFunctionReturn(PETSC_SUCCESS);
99 }
100
101 /*@
102 STMatMultTranspose - Computes the matrix-vector product $y = T_k^T x$, where $T_k$
103 is the $k$-th (transformed) matrix of the spectral transformation.
104
105 Neighbor-wise Collective
106
107 Input Parameters:
108 + st - the spectral transformation context
109 . k - index of matrix to use
110 - x - the vector to be multiplied
111
112 Output Parameter:
113 . y - the result
114
115 Level: developer
116
117 .seealso: [](ch:st), `STMatMult()`, `STMatMultHermitianTranspose()`, `STGetMatrixTransformed()`
118 @*/
119 45 PetscErrorCode STMatMultTranspose(ST st,PetscInt k,Vec x,Vec y)
120 {
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45 PetscFunctionBegin;
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45 PetscValidHeaderSpecific(st,ST_CLASSID,1);
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45 PetscValidLogicalCollectiveInt(st,k,2);
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45 PetscValidHeaderSpecific(x,VEC_CLASSID,3);
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45 PetscValidHeaderSpecific(y,VEC_CLASSID,4);
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45 STCheckMatrices(st,1);
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45 PetscCheck(k>=0 && k<PetscMax(2,st->nmat),PetscObjectComm((PetscObject)st),PETSC_ERR_ARG_OUTOFRANGE,"k must be between 0 and %" PetscInt_FMT,st->nmat);
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45 PetscCheck(x!=y,PetscObjectComm((PetscObject)st),PETSC_ERR_ARG_IDN,"x and y must be different vectors");
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45 PetscCall(VecSetErrorIfLocked(y,3));
130
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45 if (st->state!=ST_STATE_SETUP) PetscCall(STSetUp(st));
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45 PetscCall(VecLockReadPush(x));
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45 PetscCall(PetscLogEventBegin(ST_MatMultTranspose,st,x,y,0));
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45 if (!st->T[k]) PetscCall(VecCopy(x,y)); /* T[k]=NULL means identity matrix */
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45 else PetscCall(MatMultTranspose(st->T[k],x,y));
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45 PetscCall(PetscLogEventEnd(ST_MatMultTranspose,st,x,y,0));
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45 PetscCall(VecLockReadPop(x));
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9 PetscFunctionReturn(PETSC_SUCCESS);
139 }
140
141 /*@
142 STMatMultHermitianTranspose - Computes the matrix-vector product $y = T_k^* x$,
143 where $T_k$ is the $k$-th (transformed) matrix of the spectral transformation.
144
145 Neighbor-wise Collective
146
147 Input Parameters:
148 + st - the spectral transformation context
149 . k - index of matrix to use
150 - x - the vector to be multiplied
151
152 Output Parameter:
153 . y - the result
154
155 Level: developer
156
157 .seealso: [](ch:st), `STMatMult()`, `STMatMultTranspose()`, `STGetMatrixTransformed()`
158 @*/
159 15 PetscErrorCode STMatMultHermitianTranspose(ST st,PetscInt k,Vec x,Vec y)
160 {
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15 PetscFunctionBegin;
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15 PetscValidHeaderSpecific(st,ST_CLASSID,1);
163
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15 PetscValidLogicalCollectiveInt(st,k,2);
164
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15 PetscValidHeaderSpecific(x,VEC_CLASSID,3);
165
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15 PetscValidHeaderSpecific(y,VEC_CLASSID,4);
166
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15 STCheckMatrices(st,1);
167
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15 PetscCheck(k>=0 && k<PetscMax(2,st->nmat),PetscObjectComm((PetscObject)st),PETSC_ERR_ARG_OUTOFRANGE,"k must be between 0 and %" PetscInt_FMT,st->nmat);
168
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15 PetscCheck(x!=y,PetscObjectComm((PetscObject)st),PETSC_ERR_ARG_IDN,"x and y must be different vectors");
169
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15 PetscCall(VecSetErrorIfLocked(y,3));
170
171
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15 if (st->state!=ST_STATE_SETUP) PetscCall(STSetUp(st));
172
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15 PetscCall(VecLockReadPush(x));
173
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15 PetscCall(PetscLogEventBegin(ST_MatMultTranspose,st,x,y,0));
174
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15 if (!st->T[k]) PetscCall(VecCopy(x,y)); /* T[k]=NULL means identity matrix */
175
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15 else PetscCall(MatMultHermitianTranspose(st->T[k],x,y));
176
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15 PetscCall(PetscLogEventEnd(ST_MatMultTranspose,st,x,y,0));
177
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15 PetscCall(VecLockReadPop(x));
178
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3 PetscFunctionReturn(PETSC_SUCCESS);
179 }
180
181 /*@
182 STMatSolve - Solves $P x = b$, where $P$ is the preconditioner matrix of
183 the spectral transformation, using a `KSP` object stored internally.
184
185 Collective
186
187 Input Parameters:
188 + st - the spectral transformation context
189 - b - right hand side vector
190
191 Output Parameter:
192 . x - computed solution
193
194 Level: developer
195
196 .seealso: [](ch:st), `STMatSolveTranspose()`, `STMatSolveHermitianTranspose()`, `STMatMatSolve()`
197 @*/
198 617197 PetscErrorCode STMatSolve(ST st,Vec b,Vec x)
199 {
200
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617197 PetscFunctionBegin;
201
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617197 PetscValidHeaderSpecific(st,ST_CLASSID,1);
202
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617197 PetscValidHeaderSpecific(b,VEC_CLASSID,2);
203
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617197 PetscValidHeaderSpecific(x,VEC_CLASSID,3);
204
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617197 STCheckMatrices(st,1);
205
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617197 PetscCheck(x!=b,PetscObjectComm((PetscObject)st),PETSC_ERR_ARG_IDN,"x and b must be different vectors");
206
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617197 PetscCall(VecSetErrorIfLocked(x,3));
207
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617197 if (st->state!=ST_STATE_SETUP) PetscCall(STSetUp(st));
209
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617197 PetscCall(VecLockReadPush(b));
210
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617197 PetscCall(PetscLogEventBegin(ST_MatSolve,st,b,x,0));
211
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617197 if (!st->P) PetscCall(VecCopy(b,x)); /* P=NULL means identity matrix */
212
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617117 else PetscCall(KSPSolve(st->ksp,b,x));
213
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617197 PetscCall(PetscLogEventEnd(ST_MatSolve,st,b,x,0));
214
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617197 PetscCall(VecLockReadPop(b));
215
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120184 PetscFunctionReturn(PETSC_SUCCESS);
216 }
217
218 /*@
219 STMatMatSolve - Solves $P X = B$, where $P$ is the preconditioner matrix of
220 the spectral transformation, using a `KSP` object stored internally.
221
222 Collective
223
224 Input Parameters:
225 + st - the spectral transformation context
226 - B - right hand side vectors
227
228 Output Parameter:
229 . X - computed solutions
230
231 Level: developer
232
233 .seealso: [](ch:st), `STMatSolve()`
234 @*/
235 36249 PetscErrorCode STMatMatSolve(ST st,Mat B,Mat X)
236 {
237
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36249 PetscFunctionBegin;
238
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36249 PetscValidHeaderSpecific(st,ST_CLASSID,1);
239
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36249 PetscValidHeaderSpecific(B,MAT_CLASSID,2);
240
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36249 PetscValidHeaderSpecific(X,MAT_CLASSID,3);
241
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36249 STCheckMatrices(st,1);
242
243
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36249 if (st->state!=ST_STATE_SETUP) PetscCall(STSetUp(st));
244
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36249 PetscCall(PetscLogEventBegin(ST_MatSolve,st,B,X,0));
245
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36249 if (!st->P) PetscCall(MatCopy(B,X,SAME_NONZERO_PATTERN)); /* P=NULL means identity matrix */
246
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36249 else PetscCall(KSPMatSolve(st->ksp,B,X));
247
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36249 PetscCall(PetscLogEventEnd(ST_MatSolve,st,B,X,0));
248
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7182 PetscFunctionReturn(PETSC_SUCCESS);
249 }
250
251 /*@
252 STMatSolveTranspose - Solves $P^T x = b$, where $P$ is the preconditioner matrix of
253 the spectral transformation, using a `KSP` object stored internally.
254
255 Collective
256
257 Input Parameters:
258 + st - the spectral transformation context
259 - b - right hand side vector
260
261 Output Parameter:
262 . x - computed solution
263
264 Level: developer
265
266 .seealso: [](ch:st), `STMatSolve()`
267 @*/
268 4404 PetscErrorCode STMatSolveTranspose(ST st,Vec b,Vec x)
269 {
270
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4404 PetscFunctionBegin;
271
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4404 PetscValidHeaderSpecific(st,ST_CLASSID,1);
272
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4404 PetscValidHeaderSpecific(b,VEC_CLASSID,2);
273
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4404 PetscValidHeaderSpecific(x,VEC_CLASSID,3);
274
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4404 STCheckMatrices(st,1);
275
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4404 PetscCheck(x!=b,PetscObjectComm((PetscObject)st),PETSC_ERR_ARG_IDN,"x and b must be different vectors");
276
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4404 PetscCall(VecSetErrorIfLocked(x,3));
277
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4404 if (st->state!=ST_STATE_SETUP) PetscCall(STSetUp(st));
279
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4404 PetscCall(VecLockReadPush(b));
280
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4404 PetscCall(PetscLogEventBegin(ST_MatSolveTranspose,st,b,x,0));
281
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4404 if (!st->P) PetscCall(VecCopy(b,x)); /* P=NULL means identity matrix */
282
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4404 else PetscCall(KSPSolveTranspose(st->ksp,b,x));
283
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4404 PetscCall(PetscLogEventEnd(ST_MatSolveTranspose,st,b,x,0));
284
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4404 PetscCall(VecLockReadPop(b));
285
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888 PetscFunctionReturn(PETSC_SUCCESS);
286 }
287
288 /*@
289 STMatSolveHermitianTranspose - Solves $P^* x = b$, where $P$ is the preconditioner matrix of
290 the spectral transformation, using a `KSP` object stored internally.
291
292 Collective
293
294 Input Parameters:
295 + st - the spectral transformation context
296 - b - right hand side vector
297
298 Output Parameter:
299 . x - computed solution
300
301 Level: developer
302
303 .seealso: [](ch:st), `STMatSolve()`
304 @*/
305 3638 PetscErrorCode STMatSolveHermitianTranspose(ST st,Vec b,Vec x)
306 {
307 3638 Vec w;
308
309
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3638 PetscFunctionBegin;
310
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3638 PetscValidHeaderSpecific(st,ST_CLASSID,1);
311
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3638 PetscValidHeaderSpecific(b,VEC_CLASSID,2);
312
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3638 PetscValidHeaderSpecific(x,VEC_CLASSID,3);
313
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3638 STCheckMatrices(st,1);
314
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3638 PetscCheck(x!=b,PetscObjectComm((PetscObject)st),PETSC_ERR_ARG_IDN,"x and b must be different vectors");
315
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3638 PetscCall(VecSetErrorIfLocked(x,3));
316
317
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3638 if (st->state!=ST_STATE_SETUP) PetscCall(STSetUp(st));
318
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3638 PetscCall(VecLockReadPush(b));
319
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3638 PetscCall(PetscLogEventBegin(ST_MatSolveTranspose,st,b,x,0));
320
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3638 if (!st->P) PetscCall(VecCopy(b,x)); /* P=NULL means identity matrix */
321 else {
322
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3638 PetscCall(VecDuplicate(b,&w));
323
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3638 PetscCall(VecCopy(b,w));
324
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3638 PetscCall(VecConjugate(w));
325
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3638 PetscCall(KSPSolveTranspose(st->ksp,w,x));
326
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3638 PetscCall(VecDestroy(&w));
327
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3638 PetscCall(VecConjugate(x));
328 }
329
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3638 PetscCall(PetscLogEventEnd(ST_MatSolveTranspose,st,b,x,0));
330
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3638 PetscCall(VecLockReadPop(b));
331
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832 PetscFunctionReturn(PETSC_SUCCESS);
332 }
333
334 12538 PetscErrorCode STCheckFactorPackage(ST st)
335 {
336 12538 PC pc;
337 12538 PetscMPIInt size;
338 12538 PetscBool flg;
339 12538 MatSolverType stype;
340
341
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12538 PetscFunctionBegin;
342
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12538 PetscCallMPI(MPI_Comm_size(PetscObjectComm((PetscObject)st),&size));
343
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12538 if (size==1) PetscFunctionReturn(PETSC_SUCCESS);
344
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904 PetscCall(KSPGetPC(st->ksp,&pc));
345
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904 PetscCall(PCFactorGetMatSolverType(pc,&stype));
346
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904 if (stype) { /* currently selected PC is a factorization */
347
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18 PetscCall(PetscStrcmp(stype,MATSOLVERPETSC,&flg));
348
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18 PetscCheck(!flg,PetscObjectComm((PetscObject)st),PETSC_ERR_SUP,"You chose to solve linear systems with a factorization, but in parallel runs you need to select an external package; see the users guide for details");
349 }
350
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164 PetscFunctionReturn(PETSC_SUCCESS);
351 }
352
353 /*@
354 STSetKSP - Sets the `KSP` object associated with the spectral
355 transformation.
356
357 Collective
358
359 Input Parameters:
360 + st - the spectral transformation context
361 - ksp - the linear solver context
362
363 Level: advanced
364
365 .seealso: [](ch:st), `STGetKSP()`
366 @*/
367 55 PetscErrorCode STSetKSP(ST st,KSP ksp)
368 {
369
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55 PetscFunctionBegin;
370
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55 PetscValidHeaderSpecific(st,ST_CLASSID,1);
371
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55 PetscValidHeaderSpecific(ksp,KSP_CLASSID,2);
372
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55 PetscCheckSameComm(st,1,ksp,2);
373
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55 STCheckNotSeized(st,1);
374
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55 PetscCall(PetscObjectReference((PetscObject)ksp));
375
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55 PetscCall(KSPDestroy(&st->ksp));
376 55 st->ksp = ksp;
377
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55 PetscFunctionReturn(PETSC_SUCCESS);
378 }
379
380 /*@
381 STGetKSP - Gets the KSP object associated with the spectral
382 transformation.
383
384 Collective
385
386 Input Parameter:
387 . st - the spectral transformation context
388
389 Output Parameter:
390 . ksp - the linear system context
391
392 Level: intermediate
393
394 .seealso: [](ch:st), `STSetKSP()`
395 @*/
396 23694 PetscErrorCode STGetKSP(ST st,KSP* ksp)
397 {
398
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23694 PetscFunctionBegin;
399
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23694 PetscValidHeaderSpecific(st,ST_CLASSID,1);
400
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23694 PetscAssertPointer(ksp,2);
401
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23694 if (!st->ksp) {
402
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8677 PetscCall(KSPCreate(PetscObjectComm((PetscObject)st),&st->ksp));
403
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8677 PetscCall(PetscObjectIncrementTabLevel((PetscObject)st->ksp,(PetscObject)st,1));
404
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8677 PetscCall(KSPSetOptionsPrefix(st->ksp,((PetscObject)st)->prefix));
405
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8677 PetscCall(KSPAppendOptionsPrefix(st->ksp,"st_"));
406
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8677 PetscCall(PetscObjectSetOptions((PetscObject)st->ksp,((PetscObject)st)->options));
407
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8677 PetscCall(KSPSetTolerances(st->ksp,SLEPC_DEFAULT_TOL,PETSC_CURRENT,PETSC_CURRENT,PETSC_CURRENT));
408 }
409 23694 *ksp = st->ksp;
410
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23694 PetscFunctionReturn(PETSC_SUCCESS);
411 }
412
413 10 PetscErrorCode STCheckNullSpace_Default(ST st,BV V)
414 {
415 10 PetscInt nc,i,c;
416 10 PetscReal norm;
417 10 Vec *T,w,vi;
418 10 Mat A;
419 10 PC pc;
420 10 MatNullSpace nullsp;
421
422
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10 PetscFunctionBegin;
423
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10 PetscCall(BVGetNumConstraints(V,&nc));
424
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10 PetscCall(PetscMalloc1(nc,&T));
425
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10 if (!st->ksp) PetscCall(STGetKSP(st,&st->ksp));
426
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10 PetscCall(KSPGetPC(st->ksp,&pc));
427
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10 PetscCall(PCGetOperators(pc,&A,NULL));
428
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10 PetscCall(MatCreateVecs(A,NULL,&w));
429 c = 0;
430
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20 for (i=0;i<nc;i++) {
431
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10 PetscCall(BVGetColumn(V,-nc+i,&vi));
432
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10 PetscCall(MatMult(A,vi,w));
433
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10 PetscCall(VecNorm(w,NORM_2,&norm));
434
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10 if (norm < 10.0*PETSC_SQRT_MACHINE_EPSILON) {
435
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10 PetscCall(PetscInfo(st,"Vector %" PetscInt_FMT " included in the nullspace of OP, norm=%g\n",i,(double)norm));
436
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10 PetscCall(BVCreateVec(V,T+c));
437
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10 PetscCall(VecCopy(vi,T[c]));
438
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10 PetscCall(VecNormalize(T[c],NULL));
439 10 c++;
440 } else PetscCall(PetscInfo(st,"Vector %" PetscInt_FMT " discarded as possible nullspace of OP, norm=%g\n",i,(double)norm));
441
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10 PetscCall(BVRestoreColumn(V,-nc+i,&vi));
442 }
443
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10 PetscCall(VecDestroy(&w));
444
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10 if (c>0) {
445
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10 PetscCall(MatNullSpaceCreate(PetscObjectComm((PetscObject)st),PETSC_FALSE,c,T,&nullsp));
446
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10 PetscCall(MatSetNullSpace(A,nullsp));
447
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10 PetscCall(MatNullSpaceDestroy(&nullsp));
448
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10 PetscCall(VecDestroyVecs(c,&T));
449 } else PetscCall(PetscFree(T));
450
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2 PetscFunctionReturn(PETSC_SUCCESS);
451 }
452
453 /*@
454 STCheckNullSpace - Tests if constraint vectors are nullspace vectors.
455
456 Collective
457
458 Input Parameters:
459 + st - the spectral transformation context
460 - V - basis vectors to be checked
461
462 Notes:
463 Given a basis vectors object, this function tests each of its constraint
464 vectors to be a nullspace vector of the coefficient matrix of the
465 associated `KSP` object. All these nullspace vectors are passed to the `KSP`
466 object with `MatSetNullSpace()`.
467
468 This function allows handling singular pencils (i.e., when $A$ and $B$ share
469 a common nullspace), and solving some problems in which the nullspace is important.
470
471 Level: developer
472
473 .seealso: [](ch:st), `EPSSetDeflationSpace()`, `MatSetNullSpace()`
474 @*/
475 148 PetscErrorCode STCheckNullSpace(ST st,BV V)
476 {
477 148 PetscInt nc;
478
479
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148 PetscFunctionBegin;
480
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148 PetscValidHeaderSpecific(st,ST_CLASSID,1);
481
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148 PetscValidHeaderSpecific(V,BV_CLASSID,2);
482
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148 PetscValidType(st,1);
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148 PetscCheckSameComm(st,1,V,2);
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148 PetscCheck(st->state,PetscObjectComm((PetscObject)st),PETSC_ERR_ARG_WRONGSTATE,"Must call STSetUp() first");
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148 PetscCall(BVGetNumConstraints(V,&nc));
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148 if (nc) PetscTryTypeMethod(st,checknullspace,V);
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28 PetscFunctionReturn(PETSC_SUCCESS);
489 }
490