Actual source code: elemental.cxx
slepc-3.17.2 2022-08-09
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: 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: EPSCheckHermitianDefinite(eps);
30: PetscObjectTypeCompare((PetscObject)eps->st,STSHIFT,&isshift);
32: eps->ncv = eps->n;
33: if (eps->mpd!=PETSC_DEFAULT) PetscInfo(eps,"Warning: parameter mpd ignored\n");
34: if (eps->max_it==PETSC_DEFAULT) eps->max_it = 1;
35: if (!eps->which) EPSSetWhichEigenpairs_Default(eps);
37: EPSCheckUnsupported(eps,EPS_FEATURE_BALANCE | EPS_FEATURE_ARBITRARY | EPS_FEATURE_REGION | EPS_FEATURE_STOPPING);
38: EPSCheckIgnored(eps,EPS_FEATURE_EXTRACTION | EPS_FEATURE_CONVERGENCE);
39: EPSAllocateSolution(eps,0);
41: /* convert matrices */
42: MatDestroy(&ctx->Ae);
43: MatDestroy(&ctx->Be);
44: STGetNumMatrices(eps->st,&nmat);
45: STGetMatrix(eps->st,0,&A);
46: MatConvert(A,MATELEMENTAL,MAT_INITIAL_MATRIX,&ctx->Ae);
47: if (nmat>1) {
48: STGetMatrix(eps->st,1,&B);
49: MatConvert(B,MATELEMENTAL,MAT_INITIAL_MATRIX,&ctx->Be);
50: }
51: STGetShift(eps->st,&shift);
52: if (shift != 0.0) {
53: if (nmat>1) MatAXPY(ctx->Ae,-shift,ctx->Be,SAME_NONZERO_PATTERN);
54: else MatShift(ctx->Ae,-shift);
55: }
56: PetscFunctionReturn(0);
57: }
59: PetscErrorCode EPSSolve_Elemental(EPS eps)
60: {
61: EPS_Elemental *ctx = (EPS_Elemental*)eps->data;
62: Mat A = ctx->Ae,B = ctx->Be,Q,V;
63: Mat_Elemental *a = (Mat_Elemental*)A->data,*b,*q;
64: PetscInt i,rrank,ridx,erow;
66: El::DistMatrix<PetscReal,El::VR,El::STAR> w(*a->grid);
67: MatDuplicate(A,MAT_DO_NOT_COPY_VALUES,&Q);
68: q = (Mat_Elemental*)Q->data;
70: if (B) {
71: b = (Mat_Elemental*)B->data;
72: El::HermitianGenDefEig(El::AXBX,El::LOWER,*a->emat,*b->emat,w,*q->emat);
73: } else El::HermitianEig(El::LOWER,*a->emat,w,*q->emat);
75: for (i=0;i<eps->ncv;i++) {
76: P2RO(A,0,i,&rrank,&ridx);
77: RO2E(A,0,rrank,ridx,&erow);
78: eps->eigr[i] = w.Get(erow,0);
79: }
80: BVGetMat(eps->V,&V);
81: MatConvert(Q,MATDENSE,MAT_REUSE_MATRIX,&V);
82: BVRestoreMat(eps->V,&V);
83: MatDestroy(&Q);
85: eps->nconv = eps->ncv;
86: eps->its = 1;
87: eps->reason = EPS_CONVERGED_TOL;
88: PetscFunctionReturn(0);
89: }
91: PetscErrorCode EPSDestroy_Elemental(EPS eps)
92: {
93: PetscFree(eps->data);
94: PetscFunctionReturn(0);
95: }
97: PetscErrorCode EPSReset_Elemental(EPS eps)
98: {
99: EPS_Elemental *ctx = (EPS_Elemental*)eps->data;
101: MatDestroy(&ctx->Ae);
102: MatDestroy(&ctx->Be);
103: PetscFunctionReturn(0);
104: }
106: SLEPC_EXTERN PetscErrorCode EPSCreate_Elemental(EPS eps)
107: {
108: EPS_Elemental *ctx;
110: PetscNewLog(eps,&ctx);
111: eps->data = (void*)ctx;
113: eps->categ = EPS_CATEGORY_OTHER;
115: eps->ops->solve = EPSSolve_Elemental;
116: eps->ops->setup = EPSSetUp_Elemental;
117: eps->ops->setupsort = EPSSetUpSort_Basic;
118: eps->ops->destroy = EPSDestroy_Elemental;
119: eps->ops->reset = EPSReset_Elemental;
120: eps->ops->backtransform = EPSBackTransform_Default;
121: eps->ops->setdefaultst = EPSSetDefaultST_NoFactor;
122: PetscFunctionReturn(0);
123: }