Actual source code: test18.c

slepc-3.18.1 2022-11-02
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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:   return 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;

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

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

 61:   /* Fill with Grcar matrix */
 62:   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:   DSRestoreArray(ds,DS_MAT_A,&A);
 68:   DSSetState(ds,DS_STATE_INTERMEDIATE);

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

 80:   /* Print eigenvalues */
 81:   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) PetscPrintf(PETSC_COMM_WORLD,"  %.5f\n",(double)re);
 91:     else PetscPrintf(PETSC_COMM_WORLD,"  %.5f%+.5fi\n",(double)re,(double)im);
 92:   }

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

110:   PetscFree2(wr,wi);
111:   DSDestroy(&ds);
112:   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*/