GCC Code Coverage Report


Directory: ./
File: src/sys/classes/bv/interface/bvlapack.c
Date: 2026-07-06 04:10:30
Exec Total Coverage
Lines: 324 350 92.6%
Functions: 9 9 100.0%
Branches: 1146 2174 52.7%

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 BV private kernels that use the LAPACK
12 */
13
14 #include <slepc/private/bvimpl.h>
15 #include <slepcblaslapack.h>
16
17 /*
18 Reduction operation to compute sqrt(x**2+y**2) when normalizing vectors
19 */
20 13904 SLEPC_EXTERN void MPIAPI SlepcPythag(void *in,void *inout,PetscMPIInt *len,MPI_Datatype *datatype)
21 {
22 13904 PetscBLASInt i,n=*len;
23 13904 PetscReal *x = (PetscReal*)in,*y = (PetscReal*)inout;
24
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13904 PetscFunctionBegin;
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13904 if (PetscUnlikely(*datatype!=MPIU_REAL)) {
27 (void)(*PetscErrorPrintf)("Only implemented for MPIU_REAL data type");
28 MPI_Abort(PETSC_COMM_WORLD,1);
29 }
30
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31448 for (i=0;i<n;i++) y[i] = SlepcAbs(x[i],y[i]);
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13904 PetscFunctionReturnVoid();
32 }
33
34 /*
35 Compute ||A|| for an mxn matrix
36 */
37 105048 PetscErrorCode BVNorm_LAPACK_Private(BV bv,PetscInt m_,PetscInt n_,const PetscScalar *A,PetscInt lda_,NormType type,PetscReal *nrm,PetscBool mpi)
38 {
39 105048 PetscBLASInt m,n,lda,i,j;
40 105048 PetscMPIInt len;
41 105048 PetscReal lnrm,*rwork=NULL,*rwork2=NULL;
42
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105048 PetscFunctionBegin;
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105048 PetscCall(PetscFPTrapPush(PETSC_FP_TRAP_OFF));
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105048 PetscCall(PetscBLASIntCast(m_,&m));
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105048 PetscCall(PetscBLASIntCast(n_,&n));
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105048 PetscCall(PetscBLASIntCast(lda_,&lda));
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105048 if (type==NORM_FROBENIUS || type==NORM_2) {
49 104944 lnrm = LAPACKlange_("F",&m,&n,(PetscScalar*)A,&lda,rwork);
50
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104944 if (mpi) PetscCallMPI(MPIU_Allreduce(&lnrm,nrm,1,MPIU_REAL,MPIU_LAPY2,PetscObjectComm((PetscObject)bv)));
51 88754 else *nrm = lnrm;
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104944 PetscCall(PetscLogFlops(2.0*m*n));
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104 } else if (type==NORM_1) {
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104 if (mpi) {
55 PetscCall(BVAllocateWork_Private(bv,2*n_));
56 rwork = (PetscReal*)bv->work;
57 rwork2 = rwork+n_;
58 PetscCall(PetscArrayzero(rwork,n_));
59 PetscCall(PetscArrayzero(rwork2,n_));
60 for (j=0;j<n_;j++) {
61 for (i=0;i<m_;i++) {
62 rwork[j] += PetscAbsScalar(A[i+j*lda_]);
63 }
64 }
65 PetscCall(PetscMPIIntCast(n_,&len));
66 PetscCallMPI(MPIU_Allreduce(rwork,rwork2,len,MPIU_REAL,MPIU_SUM,PetscObjectComm((PetscObject)bv)));
67 *nrm = 0.0;
68 for (j=0;j<n_;j++) if (rwork2[j] > *nrm) *nrm = rwork2[j];
69 } else {
70 104 *nrm = LAPACKlange_("O",&m,&n,(PetscScalar*)A,&lda,rwork);
71 }
72
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104 PetscCall(PetscLogFlops(1.0*m*n));
73 } else if (type==NORM_INFINITY) {
74 PetscCall(BVAllocateWork_Private(bv,m_));
75 rwork = (PetscReal*)bv->work;
76 lnrm = LAPACKlange_("I",&m,&n,(PetscScalar*)A,&lda,rwork);
77 if (mpi) PetscCallMPI(MPIU_Allreduce(&lnrm,nrm,1,MPIU_REAL,MPIU_MAX,PetscObjectComm((PetscObject)bv)));
78 else *nrm = lnrm;
79 PetscCall(PetscLogFlops(1.0*m*n));
80 }
81
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105048 PetscCall(PetscFPTrapPop());
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21807 PetscFunctionReturn(PETSC_SUCCESS);
83 }
84
85 /*
86 Normalize the columns of an mxn matrix A
87 */
88 38279 PetscErrorCode BVNormalize_LAPACK_Private(BV bv,PetscInt m_,PetscInt n_,const PetscScalar *A,PetscInt lda_,PetscScalar *eigi,PetscBool mpi)
89 {
90 38279 PetscBLASInt m,lda,j,k,zero=0;
91 38279 PetscMPIInt len;
92 38279 PetscReal *norms,*rwork=NULL,*rwork2=NULL,done=1.0;
93
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38279 PetscFunctionBegin;
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38279 PetscCall(PetscFPTrapPush(PETSC_FP_TRAP_OFF));
96
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38279 PetscCall(PetscBLASIntCast(m_,&m));
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38279 PetscCall(PetscBLASIntCast(lda_,&lda));
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38279 PetscCall(BVAllocateWork_Private(bv,2*n_));
99 38279 rwork = (PetscReal*)bv->work;
100 38279 rwork2 = rwork+n_;
101 /* compute local norms */
102
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415483 for (j=0;j<n_;j++) {
103 377204 k = 1;
104
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377204 if (!PetscDefined(USE_COMPLEX) && eigi && eigi[j] != 0.0) k = 2;
105 377204 rwork[j] = LAPACKlange_("F",&m,&k,(PetscScalar*)(A+j*lda_),&lda,rwork2);
106
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377204 if (k==2) { rwork[j+1] = rwork[j]; j++; }
107 }
108 /* reduction to get global norms */
109
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38279 if (mpi) {
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1306 PetscCall(PetscMPIIntCast(n_,&len));
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1306 PetscCall(PetscArrayzero(rwork2,n_));
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1306 PetscCallMPI(MPIU_Allreduce(rwork,rwork2,len,MPIU_REAL,MPIU_LAPY2,PetscObjectComm((PetscObject)bv)));
113 230 norms = rwork2;
114 } else norms = rwork;
115 /* scale columns */
116
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415483 for (j=0;j<n_;j++) {
117 377204 k = 1;
118 #if !defined(PETSC_USE_COMPLEX)
119
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176709 if (eigi && eigi[j] != 0.0) k = 2;
120 #endif
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377204 PetscCallLAPACKInfo("LAPACKlascl",LAPACKlascl_("G",&zero,&zero,norms+j,&done,&m,&k,(PetscScalar*)(A+j*lda_),&lda,&info));
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377204 if (k==2) j++;
123 }
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38279 PetscCall(PetscLogFlops(3.0*m*n_));
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38279 PetscCall(PetscFPTrapPop());
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7624 PetscFunctionReturn(PETSC_SUCCESS);
127 }
128
129 /*
130 Compute the upper Cholesky factor in R and its inverse in S.
131 If S == R then the inverse overwrites the Cholesky factor.
132 */
133 1178 PetscErrorCode BVMatCholInv_LAPACK_Private(BV bv,Mat R,Mat S)
134 {
135 1178 PetscInt i,k,l,n,m,ld,lds;
136 1178 PetscScalar *pR,*pS;
137 1178 PetscBLASInt info,n_ = 0,m_ = 0,ld_,lds_;
138
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1178 PetscFunctionBegin;
140 1178 l = bv->l;
141 1178 k = bv->k;
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1178 PetscCall(MatGetSize(R,&m,NULL));
143 1178 n = k-l;
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1178 PetscCall(PetscBLASIntCast(m,&m_));
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1178 PetscCall(PetscBLASIntCast(n,&n_));
146 1178 ld = m;
147 1178 ld_ = m_;
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1178 PetscCall(MatDenseGetArray(R,&pR));
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1178 if (S==R) {
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794 PetscCall(BVAllocateWork_Private(bv,m*k));
152 794 pS = bv->work;
153 794 lds = ld;
154 794 lds_ = ld_;
155 } else {
156
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384 PetscCall(MatDenseGetArray(S,&pS));
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384 PetscCall(MatGetSize(S,&lds,NULL));
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384 PetscCall(PetscBLASIntCast(lds,&lds_));
159 }
160
161 /* save a copy of matrix in S */
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10810 for (i=l;i<k;i++) PetscCall(PetscArraycpy(pS+i*lds+l,pR+i*ld+l,n));
163
164 /* compute upper Cholesky factor in R */
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1178 PetscCall(PetscFPTrapPush(PETSC_FP_TRAP_OFF));
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1178 PetscCallBLAS("LAPACKpotrf",LAPACKpotrf_("U",&n_,pR+l*ld+l,&ld_,&info));
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1178 PetscCall(PetscLogFlops((1.0*n*n*n)/3.0));
168
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1178 if (info) { /* LAPACKpotrf failed, retry on diagonally perturbed matrix */
170 for (i=l;i<k;i++) {
171 PetscCall(PetscArraycpy(pR+i*ld+l,pS+i*lds+l,n));
172 pR[i+i*ld] += 50.0*PETSC_MACHINE_EPSILON;
173 }
174 PetscCallLAPACKInfo("LAPACKpotrf",LAPACKpotrf_("U",&n_,pR+l*ld+l,&ld_,&info));
175 PetscCall(PetscLogFlops((1.0*n*n*n)/3.0));
176 }
177
178 /* compute S = inv(R) */
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1178 if (S==R) {
180
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794 PetscCallLAPACKInfo("LAPACKtrtri",LAPACKtrtri_("U","N",&n_,pR+l*ld+l,&ld_,&info));
181 } else {
182
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384 PetscCall(PetscArrayzero(pS+l*lds,(k-l)*k));
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1920 for (i=l;i<k;i++) PetscCall(PetscArraycpy(pS+i*lds+l,pR+i*ld+l,n));
184
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384 PetscCallLAPACKInfo("LAPACKtrtri",LAPACKtrtri_("U","N",&n_,pS+l*lds+l,&lds_,&info));
185 }
186
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1178 PetscCall(PetscFPTrapPop());
187
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1178 PetscCall(PetscLogFlops(0.33*n*n*n));
188
189 /* Zero out entries below the diagonal */
190
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9632 for (i=l;i<k-1;i++) {
191
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8454 PetscCall(PetscArrayzero(pR+i*ld+i+1,(k-i-1)));
192
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8838 if (S!=R) PetscCall(PetscArrayzero(pS+i*lds+i+1,(k-i-1)));
193 }
194
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1178 PetscCall(MatDenseRestoreArray(R,&pR));
195
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1178 if (S!=R) PetscCall(MatDenseRestoreArray(S,&pS));
196
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210 PetscFunctionReturn(PETSC_SUCCESS);
197 }
198
199 /*
200 Compute the inverse of an upper triangular matrix R, store it in S.
201 If S == R then the inverse overwrites R.
202 */
203 794 PetscErrorCode BVMatTriInv_LAPACK_Private(BV bv,Mat R,Mat S)
204 {
205 794 PetscInt i,k,l,n,m,ld,lds;
206 794 PetscScalar *pR,*pS;
207 794 PetscBLASInt n_,m_ = 0,ld_,lds_;
208
209
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794 PetscFunctionBegin;
210 794 l = bv->l;
211 794 k = bv->k;
212
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794 PetscCall(MatGetSize(R,&m,NULL));
213 794 n = k-l;
214
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794 PetscCall(PetscBLASIntCast(m,&m_));
215
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794 PetscCall(PetscBLASIntCast(n,&n_));
216 794 ld = m;
217 794 ld_ = m_;
218
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794 PetscCall(MatDenseGetArray(R,&pR));
219
220
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794 if (S==R) {
221
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602 PetscCall(BVAllocateWork_Private(bv,m*k));
222 602 pS = bv->work;
223 602 lds = ld;
224 602 lds_ = ld_;
225 } else {
226
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192 PetscCall(MatDenseGetArray(S,&pS));
227
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192 PetscCall(MatGetSize(S,&lds,NULL));
228
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192 PetscCall(PetscBLASIntCast(lds,&lds_));
229 }
230
231 /* compute S = inv(R) */
232
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794 PetscCall(PetscFPTrapPush(PETSC_FP_TRAP_OFF));
233
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794 if (S==R) {
234
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602 PetscCallLAPACKInfo("LAPACKtrtri",LAPACKtrtri_("U","N",&n_,pR+l*ld+l,&ld_,&info));
235 } else {
236
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192 PetscCall(PetscArrayzero(pS+l*lds,(k-l)*k));
237
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960 for (i=l;i<k;i++) PetscCall(PetscArraycpy(pS+i*lds+l,pR+i*ld+l,n));
238
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192 PetscCallLAPACKInfo("LAPACKtrtri",LAPACKtrtri_("U","N",&n_,pS+l*lds+l,&lds_,&info));
239 }
240
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794 PetscCall(PetscFPTrapPop());
241
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794 PetscCall(PetscLogFlops(0.33*n*n*n));
242
243
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794 PetscCall(MatDenseRestoreArray(R,&pR));
244
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794 if (S!=R) PetscCall(MatDenseRestoreArray(S,&pS));
245
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146 PetscFunctionReturn(PETSC_SUCCESS);
246 }
247
248 /*
249 Compute the matrix to be used for post-multiplying the basis in the SVQB
250 block orthogonalization method.
251 On input R = V'*V, on output S = D*U*Lambda^{-1/2} where (U,Lambda) is
252 the eigendecomposition of D*R*D with D=diag(R)^{-1/2}.
253 If S == R then the result overwrites R.
254 */
255 1178 PetscErrorCode BVMatSVQB_LAPACK_Private(BV bv,Mat R,Mat S)
256 {
257 1178 PetscInt i,j,k,l,n,m,ld,lds;
258 1178 PetscScalar *pR,*pS,*D,*work,a;
259 1178 PetscReal *eig,dummy;
260 1178 PetscBLASInt lwork,n_,m_ = 0,ld_,lds_;
261 #if defined(PETSC_USE_COMPLEX)
262 589 PetscReal *rwork,rdummy;
263 #endif
264
265
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1178 PetscFunctionBegin;
266 1178 l = bv->l;
267 1178 k = bv->k;
268
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1178 PetscCall(MatGetSize(R,&m,NULL));
269
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1178 PetscCall(MatDenseGetLDA(R,&ld));
270 1178 n = k-l;
271
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1178 PetscCall(PetscBLASIntCast(m,&m_));
272
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1178 PetscCall(PetscBLASIntCast(n,&n_));
273 1178 ld_ = m_;
274
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1178 PetscCall(MatDenseGetArray(R,&pR));
275
276
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1178 if (S==R) {
277 794 pS = pR;
278 794 lds = ld;
279 794 lds_ = ld_;
280 } else {
281
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384 PetscCall(MatDenseGetArray(S,&pS));
282
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384 PetscCall(MatDenseGetLDA(S,&lds));
283
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384 PetscCall(PetscBLASIntCast(lds,&lds_));
284 }
285
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1178 PetscCall(PetscFPTrapPush(PETSC_FP_TRAP_OFF));
286
287 /* workspace query and memory allocation */
288 1178 lwork = -1;
289 #if defined(PETSC_USE_COMPLEX)
290
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589 PetscCallLAPACKInfo("LAPACKsyev",LAPACKsyev_("V","L",&n_,pS,&lds_,&dummy,&a,&lwork,&rdummy,&info));
291
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589 PetscCall(PetscBLASIntCast((PetscInt)PetscRealPart(a),&lwork));
292
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589 PetscCall(PetscMalloc4(n,&eig,n,&D,lwork,&work,PetscMax(1,3*n-2),&rwork));
293 #else
294
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589 PetscCallLAPACKInfo("LAPACKsyev",LAPACKsyev_("V","L",&n_,pS,&lds_,&dummy,&a,&lwork,&info));
295
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589 PetscCall(PetscBLASIntCast((PetscInt)a,&lwork));
296
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589 PetscCall(PetscMalloc3(n,&eig,n,&D,lwork,&work));
297 #endif
298
299 /* copy and scale matrix */
300
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10810 for (i=l;i<k;i++) D[i-l] = 1.0/PetscSqrtReal(PetscRealPart(pR[i+i*ld]));
301
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131130 for (i=l;i<k;i++) for (j=l;j<k;j++) pS[i+j*lds] = pR[i+j*ld]*D[i-l];
302
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131130 for (j=l;j<k;j++) for (i=l;i<k;i++) pS[i+j*lds] *= D[j-l];
303
304 /* compute eigendecomposition */
305 #if defined(PETSC_USE_COMPLEX)
306
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589 PetscCallLAPACKInfo("LAPACKsyev",LAPACKsyev_("V","L",&n_,pS+l*lds+l,&lds_,eig,work,&lwork,rwork,&info));
307 #else
308
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589 PetscCallLAPACKInfo("LAPACKsyev",LAPACKsyev_("V","L",&n_,pS+l*lds+l,&lds_,eig,work,&lwork,&info));
309 #endif
310
311
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1178 if (S!=R) { /* R = U' */
312
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9600 for (i=l;i<k;i++) for (j=l;j<k;j++) pR[i+j*ld] = pS[j+i*lds];
313 }
314
315 /* compute S = D*U*Lambda^{-1/2} */
316
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131130 for (i=l;i<k;i++) for (j=l;j<k;j++) pS[i+j*lds] *= D[i-l];
317
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131130 for (j=l;j<k;j++) for (i=l;i<k;i++) pS[i+j*lds] /= PetscSqrtReal(eig[j-l]);
318
319
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1178 if (S!=R) { /* compute R = inv(S) = Lambda^{1/2}*U'/D */
320
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9600 for (i=l;i<k;i++) for (j=l;j<k;j++) pR[i+j*ld] *= PetscSqrtReal(eig[i-l]);
321
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9600 for (j=l;j<k;j++) for (i=l;i<k;i++) pR[i+j*ld] /= D[j-l];
322 }
323
324 #if defined(PETSC_USE_COMPLEX)
325
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589 PetscCall(PetscFree4(eig,D,work,rwork));
326 #else
327
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589 PetscCall(PetscFree3(eig,D,work));
328 #endif
329
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1178 PetscCall(PetscLogFlops(9.0*n*n*n));
330
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1178 PetscCall(PetscFPTrapPop());
331
332
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1178 PetscCall(MatDenseRestoreArray(R,&pR));
333
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1178 if (S!=R) PetscCall(MatDenseRestoreArray(S,&pS));
334
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210 PetscFunctionReturn(PETSC_SUCCESS);
335 }
336
337 /*
338 QR factorization of an mxn matrix via parallel TSQR
339 */
340 2101 PetscErrorCode BVOrthogonalize_LAPACK_TSQR(BV bv,PetscInt m_,PetscInt n_,PetscScalar *Q,PetscInt ldq_,PetscScalar *R,PetscInt ldr)
341 {
342 2101 PetscInt level,plevel,nlevels,lda,worklen;
343 2101 PetscBLASInt m,n,ldq,i,j,k,l,nb,sz,lwork;
344 2101 PetscScalar *tau,*work,*A=NULL,*QQ=NULL,*Qhalf,*C=NULL,one=1.0,zero=0.0;
345 2101 PetscMPIInt rank,size,count,stride,powtwo,s = 0;
346 2101 MPI_Datatype tmat;
347
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2101 PetscFunctionBegin;
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2101 PetscCall(PetscFPTrapPush(PETSC_FP_TRAP_OFF));
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2101 PetscCall(PetscBLASIntCast(m_,&m));
351
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2101 PetscCall(PetscBLASIntCast(n_,&n));
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2101 PetscCall(PetscBLASIntCast(ldq_,&ldq));
353 2101 k = PetscMin(m,n);
354 2101 nb = 16;
355 2101 lda = 2*n;
356
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2101 PetscCallMPI(MPI_Comm_size(PetscObjectComm((PetscObject)bv),&size));
357
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2101 PetscCallMPI(MPI_Comm_rank(PetscObjectComm((PetscObject)bv),&rank));
358 2101 nlevels = (PetscInt)PetscCeilReal(PetscLog2Real((PetscReal)size));
359
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4202 PetscCall(PetscMPIIntCast(PetscPowInt(2,(PetscInt)PetscFloorReal(PetscLog2Real((PetscReal)size))),&powtwo));
360 2101 worklen = n+n*nb;
361
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2101 if (nlevels) worklen += n*lda+n*lda*nlevels+n*lda;
362
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2101 PetscCall(BVAllocateWork_Private(bv,worklen));
363 2101 tau = bv->work;
364 2101 work = bv->work+n;
365
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2101 PetscCall(PetscBLASIntCast(n*nb,&lwork));
366
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2101 if (nlevels) {
367 1224 A = bv->work+n+n*nb;
368 1224 QQ = bv->work+n+n*nb+n*lda;
369 1224 C = bv->work+n+n*nb+n*lda+n*lda*nlevels;
370 }
371
372 /* Compute QR */
373
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2101 PetscCallLAPACKInfo("LAPACKgeqrf",LAPACKgeqrf_(&m,&n,Q,&ldq,tau,work,&lwork,&info));
374
375 /* Extract R */
376
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2101 if (R || nlevels) {
377
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26697 for (j=0;j<n;j++) {
378
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273234 for (i=0;i<=PetscMin(j,m-1);i++) {
379
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248638 if (nlevels) A[i+j*lda] = Q[i+j*ldq];
380 231310 else R[i+j*ldr] = Q[i+j*ldq];
381 }
382
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252318 for (i=PetscMin(j,m-1)+1;i<n;i++) {
383
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227722 if (nlevels) A[i+j*lda] = 0.0;
384 212450 else R[i+j*ldr] = 0.0;
385 }
386 }
387 }
388
389 /* Compute orthogonal matrix in Q */
390
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2101 PetscCallLAPACKInfo("LAPACKorgqr",LAPACKorgqr_(&m,&k,&k,Q,&ldq,tau,work,&lwork,&info));
391
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2101 if (nlevels) {
393
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1224 PetscCall(PetscMPIIntCast(n,&count));
395
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1224 PetscCall(PetscMPIIntCast(lda,&stride));
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1224 PetscCall(PetscBLASIntCast(lda,&l));
397
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1224 PetscCallMPI(MPI_Type_vector(count,count,stride,MPIU_SCALAR,&tmat));
398
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1224 PetscCallMPI(MPI_Type_commit(&tmat));
399
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4128 for (level=nlevels;level>=1;level--) {
401
402 2904 plevel = PetscPowInt(2,level);
403
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5808 PetscCall(PetscMPIIntCast(plevel*PetscFloorReal(rank/(PetscReal)plevel)+(rank+PetscPowInt(2,level-1))%plevel,&s));
404
405 /* Stack triangular matrices */
406
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2904 if (rank<s && s<size) { /* send top part, receive bottom part */
407
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1272 PetscCallMPI(MPI_Sendrecv(A,1,tmat,s,111,A+n,1,tmat,s,111,PetscObjectComm((PetscObject)bv),MPI_STATUS_IGNORE));
408
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1632 } else if (s<size) { /* copy top to bottom, receive top part */
409
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1272 PetscCallMPI(MPI_Sendrecv(A,1,tmat,rank,111,A+n,1,tmat,rank,111,PetscObjectComm((PetscObject)bv),MPI_STATUS_IGNORE));
410
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1272 PetscCallMPI(MPI_Sendrecv(A+n,1,tmat,s,111,A,1,tmat,s,111,PetscObjectComm((PetscObject)bv),MPI_STATUS_IGNORE));
411 }
412
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2904 if (level<nlevels && size!=powtwo) { /* for cases when size is not a power of 2 */
413
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1680 if (rank<size-powtwo) { /* send bottom part */
414
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720 PetscCallMPI(MPI_Send(A+n,1,tmat,rank+powtwo,111,PetscObjectComm((PetscObject)bv)));
415
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960 } else if (rank>=powtwo) { /* receive bottom part */
416
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720 PetscCallMPI(MPI_Recv(A+n,1,tmat,rank-powtwo,111,PetscObjectComm((PetscObject)bv),MPI_STATUS_IGNORE));
417 }
418 }
419 /* Compute QR and build orthogonal matrix */
420
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2904 if (level<nlevels || (level==nlevels && s<size)) {
421
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2784 PetscCallLAPACKInfo("LAPACKgeqrf",LAPACKgeqrf_(&l,&n,A,&l,tau,work,&lwork,&info));
422
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2784 PetscCall(PetscArraycpy(QQ+(level-1)*n*lda,A,n*lda));
423
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2784 PetscCallLAPACKInfo("LAPACKorgqr",LAPACKorgqr_(&l,&n,&n,QQ+(level-1)*n*lda,&l,tau,work,&lwork,&info));
424
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16320 for (j=0;j<n;j++) {
425
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46208 for (i=j+1;i<n;i++) A[i+j*lda] = 0.0;
426 }
427
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120 } else if (level==nlevels) { /* only one triangular matrix, set Q=I */
428
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120 PetscCall(PetscArrayzero(QQ+(level-1)*n*lda,n*lda));
429
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720 for (j=0;j<n;j++) QQ[j+j*lda+(level-1)*n*lda] = 1.0;
430 }
431 }
432
433 /* Extract R */
434
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1224 if (R) {
435
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6960 for (j=0;j<n;j++) {
436
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24904 for (i=0;i<=j;i++) R[i+j*ldr] = A[i+j*lda];
437
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19168 for (i=j+1;i<n;i++) R[i+j*ldr] = 0.0;
438 }
439 }
440
441 /* Accumulate orthogonal matrices */
442
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4128 for (level=1;level<=nlevels;level++) {
443 2904 plevel = PetscPowInt(2,level);
444
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5808 PetscCall(PetscMPIIntCast(plevel*PetscFloorReal(rank/(PetscReal)plevel)+(rank+PetscPowInt(2,level-1))%plevel,&s));
445
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2904 Qhalf = (rank<s)? QQ+(level-1)*n*lda: QQ+(level-1)*n*lda+n;
446
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2904 if (level<nlevels) {
447
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1680 PetscCallBLAS("BLASgemm",BLASgemm_("N","N",&l,&n,&n,&one,QQ+level*n*lda,&l,Qhalf,&l,&zero,C,&l));
448
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1680 PetscCall(PetscArraycpy(QQ+level*n*lda,C,n*lda));
449 } else {
450
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1888 for (i=0;i<m/l;i++) {
451
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664 PetscCallBLAS("BLASgemm",BLASgemm_("N","N",&l,&n,&n,&one,Q+i*l,&ldq,Qhalf,&l,&zero,C,&l));
452
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3392 for (j=0;j<n;j++) PetscCall(PetscArraycpy(Q+i*l+j*ldq,C+j*l,l));
453 }
454 1224 sz = m%l;
455
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1224 if (sz) {
456
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1224 PetscCallBLAS("BLASgemm",BLASgemm_("N","N",&sz,&n,&n,&one,Q+(m/l)*l,&ldq,Qhalf,&l,&zero,C,&l));
457
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6960 for (j=0;j<n;j++) PetscCall(PetscArraycpy(Q+(m/l)*l+j*ldq,C+j*l,sz));
458 }
459 }
460 }
461
462
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1224 PetscCallMPI(MPI_Type_free(&tmat));
463 }
464
465
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2101 PetscCall(PetscLogFlops(3.0*m*n*n));
466
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2101 PetscCall(PetscFPTrapPop());
467
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380 PetscFunctionReturn(PETSC_SUCCESS);
468 }
469
470 /*
471 Reduction operation to compute [~,Rout]=qr([Rin1;Rin2]) in the TSQR algorithm;
472 all matrices are upper triangular stored in packed format
473 */
474 384 SLEPC_EXTERN void MPIAPI SlepcGivensPacked(void *in,void *inout,PetscMPIInt *len,MPI_Datatype *datatype)
475 {
476 384 PetscBLASInt n,i,j,k,one=1;
477 384 PetscMPIInt tsize;
478 384 PetscScalar v,s,*R2=(PetscScalar*)in,*R1=(PetscScalar*)inout;
479 384 PetscReal c;
480
481
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384 PetscFunctionBegin;
482
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384 PetscCallMPIAbort(PETSC_COMM_SELF,MPI_Type_size(*datatype,&tsize)); /* we assume len=1 */
483 384 tsize /= sizeof(PetscScalar);
484 384 n = (-1+(PetscBLASInt)PetscSqrtReal(1+8*tsize))/2;
485
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1920 for (j=0;j<n;j++) {
486
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6144 for (i=0;i<=j;i++) {
487 4608 LAPACKlartg_(R1+(2*n-j-1)*j/2+j,R2+(2*n-i-1)*i/2+j,&c,&s,&v);
488 4608 R1[(2*n-j-1)*j/2+j] = v;
489 4608 k = n-j-1;
490
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4608 if (k) BLASrot_(&k,R1+(2*n-j-1)*j/2+j+1,&one,R2+(2*n-i-1)*i/2+j+1,&one,&c,&s);
491 }
492 }
493
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384 PetscFunctionReturnVoid();
494 }
495
496 /*
497 Computes the R factor of the QR factorization of an mxn matrix via parallel TSQR
498 */
499 794 PetscErrorCode BVOrthogonalize_LAPACK_TSQR_OnlyR(BV bv,PetscInt m_,PetscInt n_,PetscScalar *Q,PetscInt ldq_,PetscScalar *R,PetscInt ldr)
500 {
501 794 PetscInt worklen;
502 794 PetscBLASInt m,n,ldq,i,j,s,nb,lwork;
503 794 PetscScalar *tau,*work,*A=NULL,*R1=NULL,*R2=NULL;
504 794 PetscMPIInt size,count;
505 794 MPI_Datatype tmat;
506
507
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794 PetscFunctionBegin;
508
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794 PetscCall(PetscFPTrapPush(PETSC_FP_TRAP_OFF));
509
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794 PetscCall(PetscBLASIntCast(m_,&m));
510
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794 PetscCall(PetscBLASIntCast(n_,&n));
511
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794 PetscCall(PetscBLASIntCast(ldq_,&ldq));
512 794 nb = 16;
513 794 s = n+n*(n-1)/2; /* length of packed triangular matrix */
514
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794 PetscCallMPI(MPI_Comm_size(PetscObjectComm((PetscObject)bv),&size));
515 794 worklen = n+n*nb+2*s+ldq*n;
516
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794 PetscCall(BVAllocateWork_Private(bv,worklen));
517 794 tau = bv->work;
518 794 work = bv->work+n;
519 794 R1 = bv->work+n+n*nb;
520 794 R2 = bv->work+n+n*nb+s;
521 794 A = bv->work+n+n*nb+2*s;
522
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794 PetscCall(PetscBLASIntCast(n*nb,&lwork));
523
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794 PetscCall(PetscArraycpy(A,Q,ldq*n));
524
525 /* Compute QR */
526
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794 PetscCallLAPACKInfo("LAPACKgeqrf",LAPACKgeqrf_(&m,&n,A,&ldq,tau,work,&lwork,&info));
527
528
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794 if (size==1) {
529 /* Extract R */
530
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6970 for (j=0;j<n;j++) {
531
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62320 for (i=0;i<=PetscMin(j,m-1);i++) R[i+j*ldr] = A[i+j*ldq];
532
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55760 for (i=PetscMin(j,m-1)+1;i<n;i++) R[i+j*ldr] = 0.0;
533 }
534 } else {
535 /* Use MPI reduction operation to obtain global R */
536
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384 PetscCall(PetscMPIIntCast(s,&count));
537
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384 PetscCallMPI(MPI_Type_contiguous(count,MPIU_SCALAR,&tmat));
538
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384 PetscCallMPI(MPI_Type_commit(&tmat));
539
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1920 for (i=0;i<n;i++) {
540
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6144 for (j=i;j<n;j++) R1[(2*n-i-1)*i/2+j] = (i<m)?A[i+j*ldq]:0.0;
541 }
542
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384 PetscCallMPI(MPIU_Allreduce(R1,R2,1,tmat,MPIU_TSQR,PetscObjectComm((PetscObject)bv)));
543
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1920 for (i=0;i<n;i++) {
544
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4608 for (j=0;j<i;j++) R[i+j*ldr] = 0.0;
545
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6144 for (j=i;j<n;j++) R[i+j*ldr] = R2[(2*n-i-1)*i/2+j];
546 }
547
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384 PetscCallMPI(MPI_Type_free(&tmat));
548 }
549
550
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794 PetscCall(PetscLogFlops(3.0*m*n*n));
551
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794 PetscCall(PetscFPTrapPop());
552
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146 PetscFunctionReturn(PETSC_SUCCESS);
553 }
554