Date: 2023-01-26T12:18:17+00:00

Actual source code: test10.c
slepc-3.18.2 2023-01-26
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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*/