Actual source code: elemental.cxx

slepc-3.16.1 2021-11-17
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  1: /*
  2:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  3:    SLEPc - Scalable Library for Eigenvalue Problem Computations
  4:    Copyright (c) 2002-2021, 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: {
 24:   EPS_Elemental  *ctx = (EPS_Elemental*)eps->data;
 25:   Mat            A,B;
 26:   PetscInt       nmat;
 27:   PetscBool      isshift;
 28:   PetscScalar    shift;

 31:   EPSCheckHermitianDefinite(eps);
 32:   PetscObjectTypeCompare((PetscObject)eps->st,STSHIFT,&isshift);
 33:   if (!isshift) SETERRQ(PetscObjectComm((PetscObject)eps),PETSC_ERR_SUP,"This solver does not support spectral transformations");
 34:   eps->ncv = eps->n;
 35:   if (eps->mpd!=PETSC_DEFAULT) { PetscInfo(eps,"Warning: parameter mpd ignored\n"); }
 36:   if (eps->max_it==PETSC_DEFAULT) eps->max_it = 1;
 37:   if (!eps->which) { EPSSetWhichEigenpairs_Default(eps); }
 38:   if (eps->which==EPS_ALL && eps->inta!=eps->intb) SETERRQ(PetscObjectComm((PetscObject)eps),PETSC_ERR_SUP,"This solver does not support interval computation");
 39:   EPSCheckUnsupported(eps,EPS_FEATURE_BALANCE | EPS_FEATURE_ARBITRARY | EPS_FEATURE_REGION | EPS_FEATURE_STOPPING);
 40:   EPSCheckIgnored(eps,EPS_FEATURE_EXTRACTION | EPS_FEATURE_CONVERGENCE);
 41:   EPSAllocateSolution(eps,0);

 43:   /* convert matrices */
 44:   MatDestroy(&ctx->Ae);
 45:   MatDestroy(&ctx->Be);
 46:   STGetNumMatrices(eps->st,&nmat);
 47:   STGetMatrix(eps->st,0,&A);
 48:   MatConvert(A,MATELEMENTAL,MAT_INITIAL_MATRIX,&ctx->Ae);
 49:   if (nmat>1) {
 50:     STGetMatrix(eps->st,1,&B);
 51:     MatConvert(B,MATELEMENTAL,MAT_INITIAL_MATRIX,&ctx->Be);
 52:   }
 53:   STGetShift(eps->st,&shift);
 54:   if (shift != 0.0) {
 55:     if (nmat>1) {
 56:       MatAXPY(ctx->Ae,-shift,ctx->Be,SAME_NONZERO_PATTERN);
 57:     } else {
 58:       MatShift(ctx->Ae,-shift);
 59:     }
 60:   }
 61:   return(0);
 62: }

 64: PetscErrorCode EPSSolve_Elemental(EPS eps)
 65: {
 67:   EPS_Elemental  *ctx = (EPS_Elemental*)eps->data;
 68:   Mat            A = ctx->Ae,B = ctx->Be,Q,V;
 69:   Mat_Elemental  *a = (Mat_Elemental*)A->data,*b,*q;
 70:   PetscInt       i,rrank,ridx,erow;

 73:   El::DistMatrix<PetscReal,El::VR,El::STAR> w(*a->grid);
 74:   MatDuplicate(A,MAT_DO_NOT_COPY_VALUES,&Q);
 75:   q = (Mat_Elemental*)Q->data;

 77:   if (B) {
 78:     b = (Mat_Elemental*)B->data;
 79:     El::HermitianGenDefEig(El::AXBX,El::LOWER,*a->emat,*b->emat,w,*q->emat);
 80:   } else El::HermitianEig(El::LOWER,*a->emat,w,*q->emat);

 82:   for (i=0;i<eps->ncv;i++) {
 83:     P2RO(A,0,i,&rrank,&ridx);
 84:     RO2E(A,0,rrank,ridx,&erow);
 85:     eps->eigr[i] = w.Get(erow,0);
 86:   }
 87:   BVGetMat(eps->V,&V);
 88:   MatConvert(Q,MATDENSE,MAT_REUSE_MATRIX,&V);
 89:   BVRestoreMat(eps->V,&V);
 90:   MatDestroy(&Q);

 92:   eps->nconv  = eps->ncv;
 93:   eps->its    = 1;
 94:   eps->reason = EPS_CONVERGED_TOL;
 95:   return(0);
 96: }

 98: PetscErrorCode EPSDestroy_Elemental(EPS eps)
 99: {

103:   PetscFree(eps->data);
104:   return(0);
105: }

107: PetscErrorCode EPSReset_Elemental(EPS eps)
108: {
110:   EPS_Elemental  *ctx = (EPS_Elemental*)eps->data;

113:   MatDestroy(&ctx->Ae);
114:   MatDestroy(&ctx->Be);
115:   return(0);
116: }

118: SLEPC_EXTERN PetscErrorCode EPSCreate_Elemental(EPS eps)
119: {
120:   EPS_Elemental  *ctx;

124:   PetscNewLog(eps,&ctx);
125:   eps->data = (void*)ctx;

127:   eps->categ = EPS_CATEGORY_OTHER;

129:   eps->ops->solve          = EPSSolve_Elemental;
130:   eps->ops->setup          = EPSSetUp_Elemental;
131:   eps->ops->setupsort      = EPSSetUpSort_Basic;
132:   eps->ops->destroy        = EPSDestroy_Elemental;
133:   eps->ops->reset          = EPSReset_Elemental;
134:   eps->ops->backtransform  = EPSBackTransform_Default;
135:   eps->ops->setdefaultst   = EPSSetDefaultST_NoFactor;
136:   return(0);
137: }