Date: 2021-02-01T14:41:45+00:00

Actual source code: test18.c
slepc-3.14.2 2021-02-01
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      1: /*
      2:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      3:    SLEPc - Scalable Library for Eigenvalue Problem Computations
      4:    Copyright (c) 2002-2020, 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: {
     18:   PetscInt       j;
     19:   PetscMPIInt    p,size,rank;
     20:   PetscScalar    dif,*buf;
     21:   PetscReal      error;

     24:   MPI_Comm_size(PETSC_COMM_WORLD,&size);
     25:   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
     26:   if (rank) {
     27:     MPI_Send(A,k,MPIU_SCALAR,0,111,PETSC_COMM_WORLD);
     28:   } else {
     29:     PetscMalloc1(k,&buf);
     30:     for (p=1;p<size;p++) {
     31:       MPI_Recv(buf,k,MPIU_SCALAR,p,111,PETSC_COMM_WORLD,MPI_STATUS_IGNORE);
     32:       dif = 0.0;
     33:       for (j=0;j<k;j++) dif += A[j]-buf[j];
     34:       error = PetscAbsScalar(dif);
     35:       if (error>10*PETSC_MACHINE_EPSILON) {
     36:         PetscPrintf(PETSC_COMM_WORLD," Array %s differs in proc %d: %g\n",label,(int)p,(double)error);
     37:       }
     38:     }
     39:     PetscFree(buf);
     40:   }
     41:   return(0);
     42: }

     44: int main(int argc,char **argv)
     45: {
     47:   DS             ds;
     48:   SlepcSC        sc;
     49:   PetscScalar    *A,*Q,*wr,*wi;
     50:   PetscReal      re,im;
     51:   PetscInt       i,j,n=10;
     52:   PetscMPIInt    size;

     54:   SlepcInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
     55:   PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);
     56:   PetscPrintf(PETSC_COMM_WORLD,"Solve a Dense System of type NHEP - dimension %D.\n",n);

     58:   /* Create DS object */
     59:   DSCreate(PETSC_COMM_WORLD,&ds);
     60:   DSSetType(ds,DSNHEP);
     61:   DSSetFromOptions(ds);
     62:   DSAllocate(ds,n);
     63:   DSSetDimensions(ds,n,0,0,0);

     65:   /* Fill with Grcar matrix */
     66:   DSGetArray(ds,DS_MAT_A,&A);
     67:   for (i=1;i<n;i++) A[i+(i-1)*n]=-1.0;
     68:   for (j=0;j<4;j++) {
     69:     for (i=0;i<n-j;i++) A[i+(i+j)*n]=1.0;
     70:   }
     71:   DSRestoreArray(ds,DS_MAT_A,&A);
     72:   DSSetState(ds,DS_STATE_INTERMEDIATE);

     74:   /* Solve */
     75:   PetscMalloc2(n,&wr,n,&wi);
     76:   DSGetSlepcSC(ds,&sc);
     77:   sc->comparison    = SlepcCompareLargestMagnitude;
     78:   sc->comparisonctx = NULL;
     79:   sc->map           = NULL;
     80:   sc->mapobj        = NULL;
     81:   DSSolve(ds,wr,wi);
     82:   DSSort(ds,wr,wi,NULL,NULL,NULL);

     84:   /* Print eigenvalues */
     85:   PetscPrintf(PETSC_COMM_WORLD,"Computed eigenvalues =\n");
     86:   for (i=0;i<n;i++) {
     87: #if defined(PETSC_USE_COMPLEX)
     88:     re = PetscRealPart(wr[i]);
     89:     im = PetscImaginaryPart(wr[i]);
     90: #else
     91:     re = wr[i];
     92:     im = wi[i];
     93: #endif
     94:     if (PetscAbs(im)<1e-10) {
     95:       PetscPrintf(PETSC_COMM_WORLD,"  %.5f\n",(double)re);
     96:     } else {
     97:       PetscPrintf(PETSC_COMM_WORLD,"  %.5f%+.5fi\n",(double)re,(double)im);
     98:     }
     99:   }

    101:   /* Synchronize data and check */
    102:   DSSynchronize(ds,wr,wi);
    103:   MPI_Comm_size(PETSC_COMM_WORLD,&size);
    104:   if (size>1) {
    105:     CheckArray(wr,"wr",n);
    106: #if !defined(PETSC_USE_COMPLEX)
    107:     CheckArray(wi,"wi",n);
    108: #endif
    109:     DSGetArray(ds,DS_MAT_A,&A);
    110:     CheckArray(A,"A",n*n);
    111:     DSRestoreArray(ds,DS_MAT_A,&A);
    112:     DSGetArray(ds,DS_MAT_Q,&Q);
    113:     CheckArray(Q,"Q",n*n);
    114:     DSRestoreArray(ds,DS_MAT_Q,&Q);
    115:   }

    117:   PetscFree2(wr,wi);
    118:   DSDestroy(&ds);
    119:   SlepcFinalize();
    120:   return ierr;
    121: }

    123: /*TEST

    125:    test:
    126:       suffix: 1
    127:       nsize: {{1 2 3}}
    128:       args: -ds_parallel redundant
    129:       filter: sed -e "s/[+-]\([0-9]\.[0-9]*i\)/+-\\1/"

    131:    test:
    132:       suffix: 2
    133:       nsize: {{1 2 3}}
    134:       args: -ds_parallel synchronized
    135:       filter: sed -e "s/[+-]\([0-9]\.[0-9]*i\)/+-\\1/"
    136:       output_file: output/test18_1.out

    138: TEST*/