Date: 2023-09-05T10:19:03+00:00

Actual source code: test18.c
slepc-3.19.2 2023-09-05
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      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: */

     11: static char help[] = "Test DSSynchronize() on a NHEP.\n\n";

     13: #include <slepcds.h>

     15: PetscErrorCode CheckArray(PetscScalar *A,const char *label,PetscInt k)
     16: {
     17:   PetscInt       j;
     18:   PetscMPIInt    p,size,rank;
     19:   PetscScalar    dif,*buf;
     20:   PetscReal      error;

     22:   PetscFunctionBeginUser;
     23:   PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size));
     24:   PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD,&rank));
     25:   if (rank) PetscCallMPI(MPI_Send(A,k,MPIU_SCALAR,0,111,PETSC_COMM_WORLD));
     26:   else {
     27:     PetscCall(PetscMalloc1(k,&buf));
     28:     for (p=1;p<size;p++) {
     29:       PetscCallMPI(MPI_Recv(buf,k,MPIU_SCALAR,p,111,PETSC_COMM_WORLD,MPI_STATUS_IGNORE));
     30:       dif = 0.0;
     31:       for (j=0;j<k;j++) dif += A[j]-buf[j];
     32:       error = PetscAbsScalar(dif);
     33:       if (error>10*PETSC_MACHINE_EPSILON) PetscCall(PetscPrintf(PETSC_COMM_WORLD," Array %s differs in proc %d: %g\n",label,(int)p,(double)error));
     34:     }
     35:     PetscCall(PetscFree(buf));
     36:   }
     37:   PetscFunctionReturn(PETSC_SUCCESS);
     38: }

     40: int main(int argc,char **argv)
     41: {
     42:   DS             ds;
     43:   SlepcSC        sc;
     44:   PetscScalar    *A,*Q,*wr,*wi;
     45:   PetscReal      re,im;
     46:   PetscInt       i,j,n=10;
     47:   PetscMPIInt    size;

     49:   PetscFunctionBeginUser;
     50:   PetscCall(SlepcInitialize(&argc,&argv,(char*)0,help));
     51:   PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL));
     52:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Solve a Dense System of type NHEP - dimension %" PetscInt_FMT ".\n",n));

     54:   /* Create DS object */
     55:   PetscCall(DSCreate(PETSC_COMM_WORLD,&ds));
     56:   PetscCall(DSSetType(ds,DSNHEP));
     57:   PetscCall(DSSetFromOptions(ds));
     58:   PetscCall(DSAllocate(ds,n));
     59:   PetscCall(DSSetDimensions(ds,n,0,0));

     61:   /* Fill with Grcar matrix */
     62:   PetscCall(DSGetArray(ds,DS_MAT_A,&A));
     63:   for (i=1;i<n;i++) A[i+(i-1)*n]=-1.0;
     64:   for (j=0;j<4;j++) {
     65:     for (i=0;i<n-j;i++) A[i+(i+j)*n]=1.0;
     66:   }
     67:   PetscCall(DSRestoreArray(ds,DS_MAT_A,&A));
     68:   PetscCall(DSSetState(ds,DS_STATE_INTERMEDIATE));

     70:   /* Solve */
     71:   PetscCall(PetscMalloc2(n,&wr,n,&wi));
     72:   PetscCall(DSGetSlepcSC(ds,&sc));
     73:   sc->comparison    = SlepcCompareLargestMagnitude;
     74:   sc->comparisonctx = NULL;
     75:   sc->map           = NULL;
     76:   sc->mapobj        = NULL;
     77:   PetscCall(DSSolve(ds,wr,wi));
     78:   PetscCall(DSSort(ds,wr,wi,NULL,NULL,NULL));

     80:   /* Print eigenvalues */
     81:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Computed eigenvalues =\n"));
     82:   for (i=0;i<n;i++) {
     83: #if defined(PETSC_USE_COMPLEX)
     84:     re = PetscRealPart(wr[i]);
     85:     im = PetscImaginaryPart(wr[i]);
     86: #else
     87:     re = wr[i];
     88:     im = wi[i];
     89: #endif
     90:     if (PetscAbs(im)<1e-10) PetscCall(PetscPrintf(PETSC_COMM_WORLD,"  %.5f\n",(double)re));
     91:     else PetscCall(PetscPrintf(PETSC_COMM_WORLD,"  %.5f%+.5fi\n",(double)re,(double)im));
     92:   }

     94:   /* Synchronize data and check */
     95:   PetscCall(DSSynchronize(ds,wr,wi));
     96:   PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size));
     97:   if (size>1) {
     98:     PetscCall(CheckArray(wr,"wr",n));
     99: #if !defined(PETSC_USE_COMPLEX)
    100:     PetscCall(CheckArray(wi,"wi",n));
    101: #endif
    102:     PetscCall(DSGetArray(ds,DS_MAT_A,&A));
    103:     PetscCall(CheckArray(A,"A",n*n));
    104:     PetscCall(DSRestoreArray(ds,DS_MAT_A,&A));
    105:     PetscCall(DSGetArray(ds,DS_MAT_Q,&Q));
    106:     PetscCall(CheckArray(Q,"Q",n*n));
    107:     PetscCall(DSRestoreArray(ds,DS_MAT_Q,&Q));
    108:   }

    110:   PetscCall(PetscFree2(wr,wi));
    111:   PetscCall(DSDestroy(&ds));
    112:   PetscCall(SlepcFinalize());
    113:   return 0;
    114: }

    116: /*TEST

    118:    testset:
    119:       nsize: {{1 2 3}}
    120:       filter: sed -e "s/[+-]\([0-9]\.[0-9]*i\)/+-\\1/" | sed -e "s/1.58254/1.58255/" | sed -e "s/1.75989/1.75988/"
    121:       output_file: output/test18_1.out
    122:       test:
    123:          suffix: 1
    124:          args: -ds_parallel redundant
    125:       test:
    126:          suffix: 2
    127:          args: -ds_parallel synchronized

    129: TEST*/