Actual source code: ex29.c

petsc-3.5.4 2015-05-23
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  2: static char help[] = "Tests VecSetValues() and VecSetValuesBlocked() on MPI vectors.\n\
  3: Where atleast a couple of mallocs will occur in the stash code.\n\n";

  5: #include <petscvec.h>

  9: int main(int argc,char **argv)
 10: {
 12:   PetscMPIInt    size;
 13:   PetscInt       i,j,n = 50,bs;
 14:   PetscScalar    val,*vals,zero=0.0;
 15:   Vec            x;

 17:   PetscInitialize(&argc,&argv,(char*)0,help);
 18:   MPI_Comm_size(PETSC_COMM_WORLD,&size);
 19:   bs   = size;

 21:   PetscOptionsGetInt(NULL,"-n",&n,NULL);
 22:   VecCreate(PETSC_COMM_WORLD,&x);
 23:   VecSetSizes(x,PETSC_DECIDE,n*bs);
 24:   VecSetBlockSize(x,bs);
 25:   VecSetFromOptions(x);

 27:   for (i=0; i<n*bs; i++) {
 28:     val  = i*1.0;
 29:     VecSetValues(x,1,&i,&val,INSERT_VALUES);
 30:   }
 31:   VecAssemblyBegin(x);
 32:   VecAssemblyEnd(x);

 34:   VecView(x,PETSC_VIEWER_STDOUT_WORLD);

 36:   /* Now do the blocksetvalues */
 37:   VecSet(x,zero);
 38:   PetscMalloc1(bs,&vals);
 39:   for (i=0; i<n; i++) {
 40:     for (j=0; j<bs; j++) vals[j] = (i*bs+j)*1.0;
 41:     VecSetValuesBlocked(x,1,&i,vals,INSERT_VALUES);
 42:   }

 44:   VecAssemblyBegin(x);
 45:   VecAssemblyEnd(x);

 47:   VecView(x,PETSC_VIEWER_STDOUT_WORLD);

 49:   VecDestroy(&x);
 50:   PetscFree(vals);
 51:   PetscFinalize();
 52:   return 0;
 53: }