Actual source code: ex29.c

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

  4: #include <petscvec.h>

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

 14:   PetscFunctionBeginUser;
 15:   PetscCall(PetscInitialize(&argc, &argv, NULL, help));
 16:   PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));
 17:   bs = size;

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

 30:   if (subset) PetscCall(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:       PetscCall(VecSetValues(x, 1, &i, &val, INSERT_VALUES));
 37:     }
 38:     PetscCall(VecAssemblyBegin(x));
 39:     PetscCall(VecAssemblyEnd(x));
 40:     if (!r) PetscCall(VecCopy(x, y)); /* Save result of first assembly */
 41:   }

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

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

 52:   /* Now do the blocksetvalues */
 53:   PetscCall(VecSet(x, zero));
 54:   PetscCall(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:       PetscCall(VecSetValuesBlocked(x, 1, &ii, vals, INSERT_VALUES));
 62:     }
 63:     PetscCall(VecAssemblyBegin(x));
 64:     PetscCall(VecAssemblyEnd(x));
 65:     if (!r) PetscCall(VecCopy(x, y)); /* Save result of first assembly */
 66:   }

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

 72:   PetscCall(VecDestroy(&x));
 73:   PetscCall(VecDestroy(&y));
 74:   PetscCall(PetscFree(vals));
 75:   PetscCall(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*/