GCC Code Coverage Report


Directory: ./
File: src/sys/classes/bv/interface/bvlapack.c
Date: 2026-04-06 03:57:41
Exec Total Coverage
Lines: 333 360 92.5%
Functions: 9 9 100.0%
Branches: 1113 2094 53.2%

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 13848 SLEPC_EXTERN void MPIAPI SlepcPythag(void *in,void *inout,PetscMPIInt *len,MPI_Datatype *datatype)
21 {
22 13848 PetscBLASInt i,n=*len;
23 13848 PetscReal *x = (PetscReal*)in,*y = (PetscReal*)inout;
24
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13848 PetscFunctionBegin;
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13848 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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30948 for (i=0;i<n;i++) y[i] = SlepcAbs(x[i],y[i]);
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13848 PetscFunctionReturnVoid();
32 }
33
34 /*
35 Compute ||A|| for an mxn matrix
36 */
37 104910 PetscErrorCode BVNorm_LAPACK_Private(BV bv,PetscInt m_,PetscInt n_,const PetscScalar *A,PetscInt lda_,NormType type,PetscReal *nrm,PetscBool mpi)
38 {
39 104910 PetscBLASInt m,n,lda,i,j;
40 104910 PetscMPIInt len;
41 104910 PetscReal lnrm,*rwork=NULL,*rwork2=NULL;
42
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104910 PetscFunctionBegin;
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104910 PetscCall(PetscFPTrapPush(PETSC_FP_TRAP_OFF));
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104910 PetscCall(PetscBLASIntCast(m_,&m));
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104910 PetscCall(PetscBLASIntCast(n_,&n));
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104910 PetscCall(PetscBLASIntCast(lda_,&lda));
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104910 if (type==NORM_FROBENIUS || type==NORM_2) {
49 104806 lnrm = LAPACKlange_("F",&m,&n,(PetscScalar*)A,&lda,rwork);
50
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104806 if (mpi) PetscCallMPI(MPIU_Allreduce(&lnrm,nrm,1,MPIU_REAL,MPIU_LAPY2,PetscObjectComm((PetscObject)bv)));
51 88616 else *nrm = lnrm;
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104806 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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104910 PetscCall(PetscFPTrapPop());
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21781 PetscFunctionReturn(PETSC_SUCCESS);
83 }
84
85 /*
86 Normalize the columns of an mxn matrix A
87 */
88 37953 PetscErrorCode BVNormalize_LAPACK_Private(BV bv,PetscInt m_,PetscInt n_,const PetscScalar *A,PetscInt lda_,PetscScalar *eigi,PetscBool mpi)
89 {
90 37953 PetscBLASInt m,lda,j,k,info,zero=0;
91 37953 PetscMPIInt len;
92 37953 PetscReal *norms,*rwork=NULL,*rwork2=NULL,done=1.0;
93
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37953 PetscFunctionBegin;
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37953 PetscCall(PetscFPTrapPush(PETSC_FP_TRAP_OFF));
96
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37953 PetscCall(PetscBLASIntCast(m_,&m));
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37953 PetscCall(PetscBLASIntCast(lda_,&lda));
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37953 PetscCall(BVAllocateWork_Private(bv,2*n_));
99 37953 rwork = (PetscReal*)bv->work;
100 37953 rwork2 = rwork+n_;
101 /* compute local norms */
102
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412721 for (j=0;j<n_;j++) {
103 374768 k = 1;
104
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374768 if (!PetscDefined(USE_COMPLEX) && eigi && eigi[j] != 0.0) k = 2;
105 374768 rwork[j] = LAPACKlange_("F",&m,&k,(PetscScalar*)(A+j*lda_),&lda,rwork2);
106
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374768 if (k==2) { rwork[j+1] = rwork[j]; j++; }
107 }
108 /* reduction to get global norms */
109
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37953 if (mpi) {
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1210 PetscCall(PetscMPIIntCast(n_,&len));
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1210 PetscCall(PetscArrayzero(rwork2,n_));
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1210 PetscCallMPI(MPIU_Allreduce(rwork,rwork2,len,MPIU_REAL,MPIU_LAPY2,PetscObjectComm((PetscObject)bv)));
113 214 norms = rwork2;
114 } else norms = rwork;
115 /* scale columns */
116
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412721 for (j=0;j<n_;j++) {
117 374768 k = 1;
118 #if !defined(PETSC_USE_COMPLEX)
119
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175029 if (eigi && eigi[j] != 0.0) k = 2;
120 #endif
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374768 PetscCallBLAS("LAPACKlascl",LAPACKlascl_("G",&zero,&zero,norms+j,&done,&m,&k,(PetscScalar*)(A+j*lda_),&lda,&info));
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374768 SlepcCheckLapackInfo("lascl",info);
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374768 if (k==2) j++;
124 }
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37953 PetscCall(PetscLogFlops(3.0*m*n_));
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37953 PetscCall(PetscFPTrapPop());
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7562 PetscFunctionReturn(PETSC_SUCCESS);
128 }
129
130 /*
131 Compute the upper Cholesky factor in R and its inverse in S.
132 If S == R then the inverse overwrites the Cholesky factor.
133 */
134 1178 PetscErrorCode BVMatCholInv_LAPACK_Private(BV bv,Mat R,Mat S)
135 {
136 1178 PetscInt i,k,l,n,m,ld,lds;
137 1178 PetscScalar *pR,*pS;
138 1178 PetscBLASInt info,n_ = 0,m_ = 0,ld_,lds_;
139
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1178 PetscFunctionBegin;
141 1178 l = bv->l;
142 1178 k = bv->k;
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1178 PetscCall(MatGetSize(R,&m,NULL));
144 1178 n = k-l;
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1178 PetscCall(PetscBLASIntCast(m,&m_));
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1178 PetscCall(PetscBLASIntCast(n,&n_));
147 1178 ld = m;
148 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));
153 794 pS = bv->work;
154 794 lds = ld;
155 794 lds_ = ld_;
156 } else {
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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_));
160 }
161
162 /* 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));
164
165 /* 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));
169
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1178 if (info) { /* LAPACKpotrf failed, retry on diagonally perturbed matrix */
171 for (i=l;i<k;i++) {
172 PetscCall(PetscArraycpy(pR+i*ld+l,pS+i*lds+l,n));
173 pR[i+i*ld] += 50.0*PETSC_MACHINE_EPSILON;
174 }
175 PetscCallBLAS("LAPACKpotrf",LAPACKpotrf_("U",&n_,pR+l*ld+l,&ld_,&info));
176 SlepcCheckLapackInfo("potrf",info);
177 PetscCall(PetscLogFlops((1.0*n*n*n)/3.0));
178 }
179
180 /* compute S = inv(R) */
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1178 if (S==R) {
182
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794 PetscCallBLAS("LAPACKtrtri",LAPACKtrtri_("U","N",&n_,pR+l*ld+l,&ld_,&info));
183 } else {
184
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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));
186
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384 PetscCallBLAS("LAPACKtrtri",LAPACKtrtri_("U","N",&n_,pS+l*lds+l,&lds_,&info));
187 }
188
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1178 SlepcCheckLapackInfo("trtri",info);
189
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1178 PetscCall(PetscFPTrapPop());
190
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1178 PetscCall(PetscLogFlops(0.33*n*n*n));
191
192 /* Zero out entries below the diagonal */
193
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9632 for (i=l;i<k-1;i++) {
194
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8454 PetscCall(PetscArrayzero(pR+i*ld+i+1,(k-i-1)));
195
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8838 if (S!=R) PetscCall(PetscArrayzero(pS+i*lds+i+1,(k-i-1)));
196 }
197
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1178 PetscCall(MatDenseRestoreArray(R,&pR));
198
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1178 if (S!=R) PetscCall(MatDenseRestoreArray(S,&pS));
199
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210 PetscFunctionReturn(PETSC_SUCCESS);
200 }
201
202 /*
203 Compute the inverse of an upper triangular matrix R, store it in S.
204 If S == R then the inverse overwrites R.
205 */
206 794 PetscErrorCode BVMatTriInv_LAPACK_Private(BV bv,Mat R,Mat S)
207 {
208 794 PetscInt i,k,l,n,m,ld,lds;
209 794 PetscScalar *pR,*pS;
210 794 PetscBLASInt info,n_,m_ = 0,ld_,lds_;
211
212
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794 PetscFunctionBegin;
213 794 l = bv->l;
214 794 k = bv->k;
215
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794 PetscCall(MatGetSize(R,&m,NULL));
216 794 n = k-l;
217
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794 PetscCall(PetscBLASIntCast(m,&m_));
218
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794 PetscCall(PetscBLASIntCast(n,&n_));
219 794 ld = m;
220 794 ld_ = m_;
221
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794 PetscCall(MatDenseGetArray(R,&pR));
222
223
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794 if (S==R) {
224
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602 PetscCall(BVAllocateWork_Private(bv,m*k));
225 602 pS = bv->work;
226 602 lds = ld;
227 602 lds_ = ld_;
228 } else {
229
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192 PetscCall(MatDenseGetArray(S,&pS));
230
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192 PetscCall(MatGetSize(S,&lds,NULL));
231
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192 PetscCall(PetscBLASIntCast(lds,&lds_));
232 }
233
234 /* compute S = inv(R) */
235
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794 PetscCall(PetscFPTrapPush(PETSC_FP_TRAP_OFF));
236
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794 if (S==R) {
237
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602 PetscCallBLAS("LAPACKtrtri",LAPACKtrtri_("U","N",&n_,pR+l*ld+l,&ld_,&info));
238 } else {
239
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192 PetscCall(PetscArrayzero(pS+l*lds,(k-l)*k));
240
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960 for (i=l;i<k;i++) PetscCall(PetscArraycpy(pS+i*lds+l,pR+i*ld+l,n));
241
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192 PetscCallBLAS("LAPACKtrtri",LAPACKtrtri_("U","N",&n_,pS+l*lds+l,&lds_,&info));
242 }
243
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794 SlepcCheckLapackInfo("trtri",info);
244
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794 PetscCall(PetscFPTrapPop());
245
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794 PetscCall(PetscLogFlops(0.33*n*n*n));
246
247
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794 PetscCall(MatDenseRestoreArray(R,&pR));
248
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794 if (S!=R) PetscCall(MatDenseRestoreArray(S,&pS));
249
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146 PetscFunctionReturn(PETSC_SUCCESS);
250 }
251
252 /*
253 Compute the matrix to be used for post-multiplying the basis in the SVQB
254 block orthogonalization method.
255 On input R = V'*V, on output S = D*U*Lambda^{-1/2} where (U,Lambda) is
256 the eigendecomposition of D*R*D with D=diag(R)^{-1/2}.
257 If S == R then the result overwrites R.
258 */
259 1178 PetscErrorCode BVMatSVQB_LAPACK_Private(BV bv,Mat R,Mat S)
260 {
261 1178 PetscInt i,j,k,l,n,m,ld,lds;
262 1178 PetscScalar *pR,*pS,*D,*work,a;
263 1178 PetscReal *eig,dummy;
264 1178 PetscBLASInt info,lwork,n_,m_ = 0,ld_,lds_;
265 #if defined(PETSC_USE_COMPLEX)
266 589 PetscReal *rwork,rdummy;
267 #endif
268
269
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1178 PetscFunctionBegin;
270 1178 l = bv->l;
271 1178 k = bv->k;
272
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1178 PetscCall(MatGetSize(R,&m,NULL));
273
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1178 PetscCall(MatDenseGetLDA(R,&ld));
274 1178 n = k-l;
275
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1178 PetscCall(PetscBLASIntCast(m,&m_));
276
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1178 PetscCall(PetscBLASIntCast(n,&n_));
277 1178 ld_ = m_;
278
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1178 PetscCall(MatDenseGetArray(R,&pR));
279
280
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1178 if (S==R) {
281 794 pS = pR;
282 794 lds = ld;
283 794 lds_ = ld_;
284 } else {
285
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384 PetscCall(MatDenseGetArray(S,&pS));
286
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384 PetscCall(MatDenseGetLDA(S,&lds));
287
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384 PetscCall(PetscBLASIntCast(lds,&lds_));
288 }
289
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1178 PetscCall(PetscFPTrapPush(PETSC_FP_TRAP_OFF));
290
291 /* workspace query and memory allocation */
292 1178 lwork = -1;
293 #if defined(PETSC_USE_COMPLEX)
294
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589 PetscCallBLAS("LAPACKsyev",LAPACKsyev_("V","L",&n_,pS,&lds_,&dummy,&a,&lwork,&rdummy,&info));
295
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589 PetscCall(PetscBLASIntCast((PetscInt)PetscRealPart(a),&lwork));
296
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589 PetscCall(PetscMalloc4(n,&eig,n,&D,lwork,&work,PetscMax(1,3*n-2),&rwork));
297 #else
298
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589 PetscCallBLAS("LAPACKsyev",LAPACKsyev_("V","L",&n_,pS,&lds_,&dummy,&a,&lwork,&info));
299
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589 PetscCall(PetscBLASIntCast((PetscInt)a,&lwork));
300
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589 PetscCall(PetscMalloc3(n,&eig,n,&D,lwork,&work));
301 #endif
302
303 /* copy and scale matrix */
304
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10810 for (i=l;i<k;i++) D[i-l] = 1.0/PetscSqrtReal(PetscRealPart(pR[i+i*ld]));
305
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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];
306
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131130 for (j=l;j<k;j++) for (i=l;i<k;i++) pS[i+j*lds] *= D[j-l];
307
308 /* compute eigendecomposition */
309 #if defined(PETSC_USE_COMPLEX)
310
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589 PetscCallBLAS("LAPACKsyev",LAPACKsyev_("V","L",&n_,pS+l*lds+l,&lds_,eig,work,&lwork,rwork,&info));
311 #else
312
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589 PetscCallBLAS("LAPACKsyev",LAPACKsyev_("V","L",&n_,pS+l*lds+l,&lds_,eig,work,&lwork,&info));
313 #endif
314
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1178 SlepcCheckLapackInfo("syev",info);
315
316
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1178 if (S!=R) { /* R = U' */
317
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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];
318 }
319
320 /* compute S = D*U*Lambda^{-1/2} */
321
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131130 for (i=l;i<k;i++) for (j=l;j<k;j++) pS[i+j*lds] *= D[i-l];
322
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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]);
323
324
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1178 if (S!=R) { /* compute R = inv(S) = Lambda^{1/2}*U'/D */
325
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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]);
326
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9600 for (j=l;j<k;j++) for (i=l;i<k;i++) pR[i+j*ld] /= D[j-l];
327 }
328
329 #if defined(PETSC_USE_COMPLEX)
330
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589 PetscCall(PetscFree4(eig,D,work,rwork));
331 #else
332
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589 PetscCall(PetscFree3(eig,D,work));
333 #endif
334
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1178 PetscCall(PetscLogFlops(9.0*n*n*n));
335
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1178 PetscCall(PetscFPTrapPop());
336
337
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1178 PetscCall(MatDenseRestoreArray(R,&pR));
338
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1178 if (S!=R) PetscCall(MatDenseRestoreArray(S,&pS));
339
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210 PetscFunctionReturn(PETSC_SUCCESS);
340 }
341
342 /*
343 QR factorization of an mxn matrix via parallel TSQR
344 */
345 2101 PetscErrorCode BVOrthogonalize_LAPACK_TSQR(BV bv,PetscInt m_,PetscInt n_,PetscScalar *Q,PetscInt ldq_,PetscScalar *R,PetscInt ldr)
346 {
347 2101 PetscInt level,plevel,nlevels,lda,worklen;
348 2101 PetscBLASInt m,n,ldq,i,j,k,l,nb,sz,lwork,info;
349 2101 PetscScalar *tau,*work,*A=NULL,*QQ=NULL,*Qhalf,*C=NULL,one=1.0,zero=0.0;
350 2101 PetscMPIInt rank,size,count,stride,powtwo,s = 0;
351 2101 MPI_Datatype tmat;
352
353
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2101 PetscFunctionBegin;
354
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2101 PetscCall(PetscFPTrapPush(PETSC_FP_TRAP_OFF));
355
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2101 PetscCall(PetscBLASIntCast(m_,&m));
356
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2101 PetscCall(PetscBLASIntCast(n_,&n));
357
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2101 PetscCall(PetscBLASIntCast(ldq_,&ldq));
358 2101 k = PetscMin(m,n);
359 2101 nb = 16;
360 2101 lda = 2*n;
361
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2101 PetscCallMPI(MPI_Comm_size(PetscObjectComm((PetscObject)bv),&size));
362
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2101 PetscCallMPI(MPI_Comm_rank(PetscObjectComm((PetscObject)bv),&rank));
363 2101 nlevels = (PetscInt)PetscCeilReal(PetscLog2Real((PetscReal)size));
364
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4202 PetscCall(PetscMPIIntCast(PetscPowInt(2,(PetscInt)PetscFloorReal(PetscLog2Real((PetscReal)size))),&powtwo));
365 2101 worklen = n+n*nb;
366
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2101 if (nlevels) worklen += n*lda+n*lda*nlevels+n*lda;
367
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2101 PetscCall(BVAllocateWork_Private(bv,worklen));
368 2101 tau = bv->work;
369 2101 work = bv->work+n;
370
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2101 PetscCall(PetscBLASIntCast(n*nb,&lwork));
371
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2101 if (nlevels) {
372 1224 A = bv->work+n+n*nb;
373 1224 QQ = bv->work+n+n*nb+n*lda;
374 1224 C = bv->work+n+n*nb+n*lda+n*lda*nlevels;
375 }
376
377 /* Compute QR */
378
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2101 PetscCallBLAS("LAPACKgeqrf",LAPACKgeqrf_(&m,&n,Q,&ldq,tau,work,&lwork,&info));
379
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2101 SlepcCheckLapackInfo("geqrf",info);
380
381 /* Extract R */
382
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2101 if (R || nlevels) {
383
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26697 for (j=0;j<n;j++) {
384
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273234 for (i=0;i<=PetscMin(j,m-1);i++) {
385
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248638 if (nlevels) A[i+j*lda] = Q[i+j*ldq];
386 231310 else R[i+j*ldr] = Q[i+j*ldq];
387 }
388
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252318 for (i=PetscMin(j,m-1)+1;i<n;i++) {
389
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227722 if (nlevels) A[i+j*lda] = 0.0;
390 212450 else R[i+j*ldr] = 0.0;
391 }
392 }
393 }
394
395 /* Compute orthogonal matrix in Q */
396
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2101 PetscCallBLAS("LAPACKorgqr",LAPACKorgqr_(&m,&k,&k,Q,&ldq,tau,work,&lwork,&info));
397
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2101 SlepcCheckLapackInfo("orgqr",info);
398
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2101 if (nlevels) {
400
401
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1224 PetscCall(PetscMPIIntCast(n,&count));
402
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1224 PetscCall(PetscMPIIntCast(lda,&stride));
403
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1224 PetscCall(PetscBLASIntCast(lda,&l));
404
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1224 PetscCallMPI(MPI_Type_vector(count,count,stride,MPIU_SCALAR,&tmat));
405
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1224 PetscCallMPI(MPI_Type_commit(&tmat));
406
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4128 for (level=nlevels;level>=1;level--) {
408
409 2904 plevel = PetscPowInt(2,level);
410
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5808 PetscCall(PetscMPIIntCast(plevel*PetscFloorReal(rank/(PetscReal)plevel)+(rank+PetscPowInt(2,level-1))%plevel,&s));
411
412 /* Stack triangular matrices */
413
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2904 if (rank<s && s<size) { /* send top part, receive bottom part */
414
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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));
415
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1632 } else if (s<size) { /* copy top to bottom, receive top part */
416
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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));
417
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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));
418 }
419
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2904 if (level<nlevels && size!=powtwo) { /* for cases when size is not a power of 2 */
420
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1680 if (rank<size-powtwo) { /* send bottom part */
421
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720 PetscCallMPI(MPI_Send(A+n,1,tmat,rank+powtwo,111,PetscObjectComm((PetscObject)bv)));
422
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960 } else if (rank>=powtwo) { /* receive bottom part */
423
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720 PetscCallMPI(MPI_Recv(A+n,1,tmat,rank-powtwo,111,PetscObjectComm((PetscObject)bv),MPI_STATUS_IGNORE));
424 }
425 }
426 /* Compute QR and build orthogonal matrix */
427
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2904 if (level<nlevels || (level==nlevels && s<size)) {
428
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2784 PetscCallBLAS("LAPACKgeqrf",LAPACKgeqrf_(&l,&n,A,&l,tau,work,&lwork,&info));
429
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2784 SlepcCheckLapackInfo("geqrf",info);
430
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2784 PetscCall(PetscArraycpy(QQ+(level-1)*n*lda,A,n*lda));
431
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2784 PetscCallBLAS("LAPACKorgqr",LAPACKorgqr_(&l,&n,&n,QQ+(level-1)*n*lda,&l,tau,work,&lwork,&info));
432
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2784 SlepcCheckLapackInfo("orgqr",info);
433
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16320 for (j=0;j<n;j++) {
434
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46208 for (i=j+1;i<n;i++) A[i+j*lda] = 0.0;
435 }
436
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120 } else if (level==nlevels) { /* only one triangular matrix, set Q=I */
437
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120 PetscCall(PetscArrayzero(QQ+(level-1)*n*lda,n*lda));
438
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720 for (j=0;j<n;j++) QQ[j+j*lda+(level-1)*n*lda] = 1.0;
439 }
440 }
441
442 /* Extract R */
443
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1224 if (R) {
444
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6960 for (j=0;j<n;j++) {
445
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24904 for (i=0;i<=j;i++) R[i+j*ldr] = A[i+j*lda];
446
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19168 for (i=j+1;i<n;i++) R[i+j*ldr] = 0.0;
447 }
448 }
449
450 /* Accumulate orthogonal matrices */
451
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4128 for (level=1;level<=nlevels;level++) {
452 2904 plevel = PetscPowInt(2,level);
453
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5808 PetscCall(PetscMPIIntCast(plevel*PetscFloorReal(rank/(PetscReal)plevel)+(rank+PetscPowInt(2,level-1))%plevel,&s));
454
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2904 Qhalf = (rank<s)? QQ+(level-1)*n*lda: QQ+(level-1)*n*lda+n;
455
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2904 if (level<nlevels) {
456
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1680 PetscCallBLAS("BLASgemm",BLASgemm_("N","N",&l,&n,&n,&one,QQ+level*n*lda,&l,Qhalf,&l,&zero,C,&l));
457
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1680 PetscCall(PetscArraycpy(QQ+level*n*lda,C,n*lda));
458 } else {
459
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1888 for (i=0;i<m/l;i++) {
460
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664 PetscCallBLAS("BLASgemm",BLASgemm_("N","N",&l,&n,&n,&one,Q+i*l,&ldq,Qhalf,&l,&zero,C,&l));
461
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3392 for (j=0;j<n;j++) PetscCall(PetscArraycpy(Q+i*l+j*ldq,C+j*l,l));
462 }
463 1224 sz = m%l;
464
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1224 if (sz) {
465
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1224 PetscCallBLAS("BLASgemm",BLASgemm_("N","N",&sz,&n,&n,&one,Q+(m/l)*l,&ldq,Qhalf,&l,&zero,C,&l));
466
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6960 for (j=0;j<n;j++) PetscCall(PetscArraycpy(Q+(m/l)*l+j*ldq,C+j*l,sz));
467 }
468 }
469 }
470
471
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1224 PetscCallMPI(MPI_Type_free(&tmat));
472 }
473
474
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2101 PetscCall(PetscLogFlops(3.0*m*n*n));
475
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2101 PetscCall(PetscFPTrapPop());
476
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380 PetscFunctionReturn(PETSC_SUCCESS);
477 }
478
479 /*
480 Reduction operation to compute [~,Rout]=qr([Rin1;Rin2]) in the TSQR algorithm;
481 all matrices are upper triangular stored in packed format
482 */
483 384 SLEPC_EXTERN void MPIAPI SlepcGivensPacked(void *in,void *inout,PetscMPIInt *len,MPI_Datatype *datatype)
484 {
485 384 PetscBLASInt n,i,j,k,one=1;
486 384 PetscMPIInt tsize;
487 384 PetscScalar v,s,*R2=(PetscScalar*)in,*R1=(PetscScalar*)inout;
488 384 PetscReal c;
489
490
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384 PetscFunctionBegin;
491
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384 PetscCallMPIAbort(PETSC_COMM_SELF,MPI_Type_size(*datatype,&tsize)); /* we assume len=1 */
492 384 tsize /= sizeof(PetscScalar);
493 384 n = (-1+(PetscBLASInt)PetscSqrtReal(1+8*tsize))/2;
494
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1920 for (j=0;j<n;j++) {
495
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6144 for (i=0;i<=j;i++) {
496 4608 LAPACKlartg_(R1+(2*n-j-1)*j/2+j,R2+(2*n-i-1)*i/2+j,&c,&s,&v);
497 4608 R1[(2*n-j-1)*j/2+j] = v;
498 4608 k = n-j-1;
499
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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);
500 }
501 }
502
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384 PetscFunctionReturnVoid();
503 }
504
505 /*
506 Computes the R factor of the QR factorization of an mxn matrix via parallel TSQR
507 */
508 794 PetscErrorCode BVOrthogonalize_LAPACK_TSQR_OnlyR(BV bv,PetscInt m_,PetscInt n_,PetscScalar *Q,PetscInt ldq_,PetscScalar *R,PetscInt ldr)
509 {
510 794 PetscInt worklen;
511 794 PetscBLASInt m,n,ldq,i,j,s,nb,lwork,info;
512 794 PetscScalar *tau,*work,*A=NULL,*R1=NULL,*R2=NULL;
513 794 PetscMPIInt size,count;
514 794 MPI_Datatype tmat;
515
516
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794 PetscFunctionBegin;
517
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794 PetscCall(PetscFPTrapPush(PETSC_FP_TRAP_OFF));
518
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794 PetscCall(PetscBLASIntCast(m_,&m));
519
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794 PetscCall(PetscBLASIntCast(n_,&n));
520
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794 PetscCall(PetscBLASIntCast(ldq_,&ldq));
521 794 nb = 16;
522 794 s = n+n*(n-1)/2; /* length of packed triangular matrix */
523
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794 PetscCallMPI(MPI_Comm_size(PetscObjectComm((PetscObject)bv),&size));
524 794 worklen = n+n*nb+2*s+ldq*n;
525
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794 PetscCall(BVAllocateWork_Private(bv,worklen));
526 794 tau = bv->work;
527 794 work = bv->work+n;
528 794 R1 = bv->work+n+n*nb;
529 794 R2 = bv->work+n+n*nb+s;
530 794 A = bv->work+n+n*nb+2*s;
531
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794 PetscCall(PetscBLASIntCast(n*nb,&lwork));
532
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794 PetscCall(PetscArraycpy(A,Q,ldq*n));
533
534 /* Compute QR */
535
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794 PetscCallBLAS("LAPACKgeqrf",LAPACKgeqrf_(&m,&n,A,&ldq,tau,work,&lwork,&info));
536
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794 SlepcCheckLapackInfo("geqrf",info);
537
538
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794 if (size==1) {
539 /* Extract R */
540
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6970 for (j=0;j<n;j++) {
541
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62320 for (i=0;i<=PetscMin(j,m-1);i++) R[i+j*ldr] = A[i+j*ldq];
542
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55760 for (i=PetscMin(j,m-1)+1;i<n;i++) R[i+j*ldr] = 0.0;
543 }
544 } else {
545 /* Use MPI reduction operation to obtain global R */
546
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384 PetscCall(PetscMPIIntCast(s,&count));
547
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384 PetscCallMPI(MPI_Type_contiguous(count,MPIU_SCALAR,&tmat));
548
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384 PetscCallMPI(MPI_Type_commit(&tmat));
549
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1920 for (i=0;i<n;i++) {
550
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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;
551 }
552
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384 PetscCallMPI(MPIU_Allreduce(R1,R2,1,tmat,MPIU_TSQR,PetscObjectComm((PetscObject)bv)));
553
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1920 for (i=0;i<n;i++) {
554
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4608 for (j=0;j<i;j++) R[i+j*ldr] = 0.0;
555
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6144 for (j=i;j<n;j++) R[i+j*ldr] = R2[(2*n-i-1)*i/2+j];
556 }
557
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384 PetscCallMPI(MPI_Type_free(&tmat));
558 }
559
560
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794 PetscCall(PetscLogFlops(3.0*m*n*n));
561
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794 PetscCall(PetscFPTrapPop());
562
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146 PetscFunctionReturn(PETSC_SUCCESS);
563 }
564