Actual source code: ex29.c


  2: static char help[] = "Tests VecSetValues() and VecSetValuesBlocked() on MPI vectors.\n\
  3: Where at least a couple of mallocs will occur in the stash code.\n\n";

  5: #include <petscvec.h>

  7: int main(int argc,char **argv)
  8: {
  9:   PetscMPIInt    size;
 10:   PetscInt       i,j,r,n = 50,repeat = 1,bs;
 11:   PetscScalar    val,*vals,zero=0.0;
 12:   PetscBool      inv = PETSC_FALSE, subset = PETSC_FALSE,flg;
 13:   Vec            x,y;

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

 19:   PetscOptionsGetInt(NULL,NULL,"-repeat",&repeat,NULL);
 20:   PetscOptionsGetBool(NULL,NULL,"-subset",&subset,NULL);
 21:   PetscOptionsGetBool(NULL,NULL,"-invert",&inv,NULL);
 22:   PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);
 23:   PetscOptionsGetInt(NULL,NULL,"-bs",&bs,NULL);
 24:   VecCreate(PETSC_COMM_WORLD,&x);
 25:   VecSetSizes(x,PETSC_DECIDE,n*bs);
 26:   VecSetBlockSize(x,bs);
 27:   VecSetFromOptions(x);
 28:   VecDuplicate(x,&y);

 30:   if (subset) VecSetOption(x,VEC_SUBSET_OFF_PROC_ENTRIES,PETSC_TRUE);

 32:   for (r=0; r<repeat; r++) {
 33:     /* Assemble the full vector on the first and last iteration, otherwise don't set any values */
 34:     for (i=0; i<n*bs*(!r || !(repeat-1-r)); i++) {
 35:       val  = i*1.0;
 36:       VecSetValues(x,1,&i,&val,INSERT_VALUES);
 37:     }
 38:     VecAssemblyBegin(x);
 39:     VecAssemblyEnd(x);
 40:     if (!r) VecCopy(x,y); /* Save result of first assembly */
 41:   }

 43:   VecView(x,PETSC_VIEWER_STDOUT_WORLD);
 44:   VecEqual(x,y,&flg);
 45:   if (!flg) PetscPrintf(PETSC_COMM_WORLD,"Vectors from repeat assembly do not match.");

 47:   /* Create a new vector because the old stash is a subset. */
 48:   VecDestroy(&x);
 49:   VecDuplicate(y,&x);
 50:   if (subset) VecSetOption(x,VEC_SUBSET_OFF_PROC_ENTRIES,PETSC_TRUE);

 52:   /* Now do the blocksetvalues */
 53:   VecSet(x,zero);
 54:   PetscMalloc1(bs,&vals);
 55:   for (r=0; r<repeat; r++) {
 56:     PetscInt up = n*(!r || !(repeat-1-r));
 57:     /* Assemble the full vector on the first and last iteration, otherwise don't set any values */
 58:     for (i=0; i<up; i++) {
 59:       PetscInt ii = inv ? up - i - 1 : i;
 60:       for (j=0; j<bs; j++) vals[j] = (ii*bs+j)*1.0;
 61:       VecSetValuesBlocked(x,1,&ii,vals,INSERT_VALUES);
 62:     }
 63:     VecAssemblyBegin(x);
 64:     VecAssemblyEnd(x);
 65:     if (!r) VecCopy(x,y); /* Save result of first assembly */
 66:   }

 68:   VecView(x,PETSC_VIEWER_STDOUT_WORLD);
 69:   VecEqual(x,y,&flg);
 70:   if (!flg) PetscPrintf(PETSC_COMM_WORLD,"Vectors from repeat block assembly do not match.");

 72:   VecDestroy(&x);
 73:   VecDestroy(&y);
 74:   PetscFree(vals);
 75:   PetscFinalize();
 76:   return 0;
 77: }

 79: /*TEST

 81:    test:
 82:       nsize: 3
 83:       args: -n 126

 85:    test:
 86:       suffix: bts_test_inv_error
 87:       nsize: 3
 88:       args: -n 4 -invert -bs 2
 89:       output_file: output/ex29_test_inv_error.out

 91:    test:
 92:       suffix: bts
 93:       nsize: 3
 94:       args: -n 126 -vec_assembly_legacy
 95:       output_file: output/ex29_1.out

 97:    test:
 98:       suffix: bts_2
 99:       nsize: 3
100:       args: -n 126 -vec_assembly_legacy -repeat 2
101:       output_file: output/ex29_1.out

103:    test:
104:       suffix: bts_2_subset
105:       nsize: 3
106:       args: -n 126 -vec_assembly_legacy -repeat 2 -subset
107:       output_file: output/ex29_1.out

109:    test:
110:       suffix: bts_2_subset_proper
111:       nsize: 3
112:       args: -n 126 -vec_assembly_legacy -repeat 5 -subset
113:       output_file: output/ex29_1.out

115: TEST*/