Actual source code: test10.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 split reductions in BV.\n\n";

 13: #include <slepcbv.h>

 15: int main(int argc,char **argv)
 16: {
 17:   Vec            t,v,w,y,z,zsplit;
 18:   BV             X;
 19:   PetscInt       i,j,n=10,k=5;
 20:   PetscScalar    *zarray;
 21:   PetscReal      nrm;

 24:   SlepcInitialize(&argc,&argv,(char*)0,help);
 25:   PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);
 26:   PetscOptionsGetInt(NULL,NULL,"-k",&k,NULL);
 28:   PetscPrintf(PETSC_COMM_WORLD,"BV split ops (%" PetscInt_FMT " columns of dimension %" PetscInt_FMT ").\n",k,n);

 30:   /* Create template vector */
 31:   VecCreate(PETSC_COMM_WORLD,&t);
 32:   VecSetSizes(t,PETSC_DECIDE,n);
 33:   VecSetFromOptions(t);
 34:   VecDuplicate(t,&v);
 35:   VecSet(v,1.0);

 37:   /* Create BV object X */
 38:   BVCreate(PETSC_COMM_WORLD,&X);
 39:   PetscObjectSetName((PetscObject)X,"X");
 40:   BVSetSizesFromVec(X,t,k);
 41:   BVSetFromOptions(X);

 43:   /* Fill X entries */
 44:   for (j=0;j<k;j++) {
 45:     BVGetColumn(X,j,&w);
 46:     VecSet(w,0.0);
 47:     for (i=0;i<4;i++) {
 48:       if (i+j<n) VecSetValue(w,i+j,(PetscScalar)(3*i+j-2),INSERT_VALUES);
 49:     }
 50:     VecAssemblyBegin(w);
 51:     VecAssemblyEnd(w);
 52:     BVRestoreColumn(X,j,&w);
 53:   }

 55:   /* Use regular operations */
 56:   VecCreateSeq(PETSC_COMM_SELF,k+6,&z);
 57:   VecGetArray(z,&zarray);
 58:   BVGetColumn(X,0,&w);
 59:   VecDot(w,v,zarray);
 60:   BVRestoreColumn(X,0,&w);
 61:   BVDotVec(X,v,zarray+1);
 62:   BVDotColumn(X,2,zarray+1+k);

 64:   BVGetColumn(X,1,&y);
 65:   VecNorm(y,NORM_2,&nrm);
 66:   BVRestoreColumn(X,1,&y);
 67:   zarray[k+3] = nrm;
 68:   BVNormVec(X,v,NORM_2,&nrm);
 69:   zarray[k+4] = nrm;
 70:   BVNormColumn(X,0,NORM_2,&nrm);
 71:   zarray[k+5] = nrm;
 72:   VecRestoreArray(z,&zarray);

 74:   /* Use split operations */
 75:   VecCreateSeq(PETSC_COMM_SELF,k+6,&zsplit);
 76:   VecGetArray(zsplit,&zarray);
 77:   BVGetColumn(X,0,&w);
 78:   VecDotBegin(w,v,zarray);
 79:   BVDotVecBegin(X,v,zarray+1);
 80:   BVDotColumnBegin(X,2,zarray+1+k);
 81:   VecDotEnd(w,v,zarray);
 82:   BVRestoreColumn(X,0,&w);
 83:   BVDotVecEnd(X,v,zarray+1);
 84:   BVDotColumnEnd(X,2,zarray+1+k);

 86:   BVGetColumn(X,1,&y);
 87:   VecNormBegin(y,NORM_2,&nrm);
 88:   BVNormVecBegin(X,v,NORM_2,&nrm);
 89:   BVNormColumnBegin(X,0,NORM_2,&nrm);
 90:   VecNormEnd(y,NORM_2,&nrm);
 91:   BVRestoreColumn(X,1,&y);
 92:   zarray[k+3] = nrm;
 93:   BVNormVecEnd(X,v,NORM_2,&nrm);
 94:   zarray[k+4] = nrm;
 95:   BVNormColumnEnd(X,0,NORM_2,&nrm);
 96:   zarray[k+5] = nrm;
 97:   VecRestoreArray(zsplit,&zarray);

 99:   /* Show difference */
100:   VecAXPY(z,-1.0,zsplit);
101:   VecNorm(z,NORM_1,&nrm);
102:   PetscSynchronizedPrintf(PETSC_COMM_WORLD,"%g\n",(double)nrm);
103:   PetscSynchronizedFlush(PETSC_COMM_WORLD,NULL);

105:   BVDestroy(&X);
106:   VecDestroy(&t);
107:   VecDestroy(&v);
108:   VecDestroy(&z);
109:   VecDestroy(&zsplit);
110:   SlepcFinalize();
111:   return 0;
112: }

114: /*TEST

116:    testset:
117:       nsize: 2
118:       output_file: output/test10_1.out
119:       test:
120:          suffix: 1
121:          args: -bv_type {{vecs contiguous svec mat}shared output}
122:       test:
123:          suffix: 1_cuda
124:          args: -bv_type svec -vec_type cuda
125:          requires: cuda

127: TEST*/