Actual source code: elemental.cxx
slepc-3.23.1 2025-05-01
1: /*
2: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
3: SLEPc - Scalable Library for Eigenvalue Problem Computations
4: Copyright (c) 2002-, Universitat Politecnica de Valencia, Spain
6: This file is part of SLEPc.
7: SLEPc is distributed under a 2-clause BSD license (see LICENSE).
8: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
9: */
10: /*
11: This file implements a wrapper to eigensolvers in Elemental.
12: */
14: #include <slepc/private/epsimpl.h>
15: #include <petsc/private/petscelemental.h>
17: typedef struct {
18: Mat Ae,Be; /* converted matrices */
19: } EPS_Elemental;
21: static PetscErrorCode EPSSetUp_Elemental(EPS eps)
22: {
23: EPS_Elemental *ctx = (EPS_Elemental*)eps->data;
24: Mat A,B;
25: PetscInt nmat;
26: PetscBool isshift;
27: PetscScalar shift;
29: PetscFunctionBegin;
30: EPSCheckHermitianDefinite(eps);
31: EPSCheckNotStructured(eps);
32: PetscCall(PetscObjectTypeCompare((PetscObject)eps->st,STSHIFT,&isshift));
33: PetscCheck(isshift,PetscObjectComm((PetscObject)eps),PETSC_ERR_SUP,"This solver does not support spectral transformations");
34: if (eps->nev==0) eps->nev = 1;
35: eps->ncv = eps->n;
36: if (eps->mpd!=PETSC_DETERMINE) PetscCall(PetscInfo(eps,"Warning: parameter mpd ignored\n"));
37: if (eps->max_it==PETSC_DETERMINE) eps->max_it = 1;
38: if (!eps->which) PetscCall(EPSSetWhichEigenpairs_Default(eps));
39: PetscCheck(eps->which!=EPS_ALL || eps->inta==eps->intb,PetscObjectComm((PetscObject)eps),PETSC_ERR_SUP,"This solver does not support interval computation");
40: EPSCheckUnsupported(eps,EPS_FEATURE_BALANCE | EPS_FEATURE_ARBITRARY | EPS_FEATURE_REGION);
41: EPSCheckIgnored(eps,EPS_FEATURE_EXTRACTION | EPS_FEATURE_CONVERGENCE | EPS_FEATURE_STOPPING);
42: PetscCall(EPSAllocateSolution(eps,0));
44: /* convert matrices */
45: PetscCall(MatDestroy(&ctx->Ae));
46: PetscCall(MatDestroy(&ctx->Be));
47: PetscCall(STGetNumMatrices(eps->st,&nmat));
48: PetscCall(STGetMatrix(eps->st,0,&A));
49: PetscCall(MatConvert(A,MATELEMENTAL,MAT_INITIAL_MATRIX,&ctx->Ae));
50: if (nmat>1) {
51: PetscCall(STGetMatrix(eps->st,1,&B));
52: PetscCall(MatConvert(B,MATELEMENTAL,MAT_INITIAL_MATRIX,&ctx->Be));
53: }
54: PetscCall(STGetShift(eps->st,&shift));
55: if (shift != 0.0) {
56: if (nmat>1) PetscCall(MatAXPY(ctx->Ae,-shift,ctx->Be,SAME_NONZERO_PATTERN));
57: else PetscCall(MatShift(ctx->Ae,-shift));
58: }
59: PetscFunctionReturn(PETSC_SUCCESS);
60: }
62: static PetscErrorCode EPSSolve_Elemental(EPS eps)
63: {
64: EPS_Elemental *ctx = (EPS_Elemental*)eps->data;
65: Mat A = ctx->Ae,B = ctx->Be,Q,V;
66: Mat_Elemental *a = (Mat_Elemental*)A->data,*b,*q;
67: PetscInt i,rrank,ridx,erow;
69: PetscFunctionBegin;
70: El::DistMatrix<PetscReal,El::VR,El::STAR> w(*a->grid);
71: PetscCall(MatDuplicate(A,MAT_DO_NOT_COPY_VALUES,&Q));
72: q = (Mat_Elemental*)Q->data;
74: if (B) {
75: b = (Mat_Elemental*)B->data;
76: El::HermitianGenDefEig(El::AXBX,El::LOWER,*a->emat,*b->emat,w,*q->emat);
77: } else El::HermitianEig(El::LOWER,*a->emat,w,*q->emat);
79: for (i=0;i<eps->ncv;i++) {
80: P2RO(A,0,i,&rrank,&ridx);
81: RO2E(A,0,rrank,ridx,&erow);
82: eps->eigr[i] = w.Get(erow,0);
83: }
84: PetscCall(BVGetMat(eps->V,&V));
85: PetscCall(MatConvert(Q,MATDENSE,MAT_REUSE_MATRIX,&V));
86: PetscCall(BVRestoreMat(eps->V,&V));
87: PetscCall(MatDestroy(&Q));
89: eps->nconv = eps->ncv;
90: eps->its = 1;
91: eps->reason = EPS_CONVERGED_TOL;
92: PetscFunctionReturn(PETSC_SUCCESS);
93: }
95: static PetscErrorCode EPSDestroy_Elemental(EPS eps)
96: {
97: PetscFunctionBegin;
98: PetscCall(PetscFree(eps->data));
99: PetscFunctionReturn(PETSC_SUCCESS);
100: }
102: static PetscErrorCode EPSReset_Elemental(EPS eps)
103: {
104: EPS_Elemental *ctx = (EPS_Elemental*)eps->data;
106: PetscFunctionBegin;
107: PetscCall(MatDestroy(&ctx->Ae));
108: PetscCall(MatDestroy(&ctx->Be));
109: PetscFunctionReturn(PETSC_SUCCESS);
110: }
112: SLEPC_EXTERN PetscErrorCode EPSCreate_Elemental(EPS eps)
113: {
114: EPS_Elemental *ctx;
116: PetscFunctionBegin;
117: PetscCall(PetscNew(&ctx));
118: eps->data = (void*)ctx;
120: eps->categ = EPS_CATEGORY_OTHER;
122: eps->ops->solve = EPSSolve_Elemental;
123: eps->ops->setup = EPSSetUp_Elemental;
124: eps->ops->setupsort = EPSSetUpSort_Basic;
125: eps->ops->destroy = EPSDestroy_Elemental;
126: eps->ops->reset = EPSReset_Elemental;
127: eps->ops->backtransform = EPSBackTransform_Default;
128: eps->ops->setdefaultst = EPSSetDefaultST_NoFactor;
129: PetscFunctionReturn(PETSC_SUCCESS);
130: }