Date: 2022-03-31T15:28:53+00:00

Actual source code: test18.c
slepc-3.17.0 2022-03-31
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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;

     23:   MPI_Comm_size(PETSC_COMM_WORLD,&size);
     24:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
     25:   if (rank) MPI_Send(A,k,MPIU_SCALAR,0,111,PETSC_COMM_WORLD);
     26:   else {
     27:     PetscMalloc1(k,&buf);
     28:     for (p=1;p<size;p++) {
     29:       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) PetscPrintf(PETSC_COMM_WORLD," Array %s differs in proc %d: %g\n",label,(int)p,(double)error);
     34:     }
     35:     PetscFree(buf);
     36:   }
     37:   PetscFunctionReturn(0);
     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:   SlepcInitialize(&argc,&argv,(char*)0,help);
     50:   PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);
     51:   PetscPrintf(PETSC_COMM_WORLD,"Solve a Dense System of type NHEP - dimension %" PetscInt_FMT ".\n",n);

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

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

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

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

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

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

    115: /*TEST

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

    128: TEST*/