Actual source code: test10.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 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;

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

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

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

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

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

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

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

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

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

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

113: /*TEST

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

126: TEST*/