Actual source code: ex13.c

  1: static char help[] = "Tests ISDuplicate(), ISCopy(), ISShift(), ISEqualUnsorted(), ISEqual().\n\n";

  3: #include <petscis.h>
  4: #include <petscviewer.h>

  6: /*
  7: type = 0 general
  8: type = 1 stride
  9: type = 2 block
 10: */
 11: static PetscErrorCode CreateIS(MPI_Comm comm, PetscInt type, PetscInt n, PetscInt first, PetscInt step, IS *is)
 12: {
 13:   PetscInt   *idx, i, j;
 14:   PetscMPIInt rank;

 16:   PetscFunctionBegin;
 17:   PetscCallMPI(MPI_Comm_rank(comm, &rank));
 18:   first += rank * n * step;
 19:   switch (type) {
 20:   case 0:
 21:     PetscCall(PetscMalloc1(n, &idx));
 22:     for (i = 0, j = first; i < n; i++, j += step) idx[i] = j;
 23:     PetscCall(ISCreateGeneral(comm, n, idx, PETSC_OWN_POINTER, is));
 24:     break;
 25:   case 1:
 26:     PetscCall(ISCreateStride(comm, n, first, step, is));
 27:     break;
 28:   case 2:
 29:     PetscCall(PetscMalloc1(n, &idx));
 30:     for (i = 0, j = first; i < n; i++, j += step) idx[i] = j;
 31:     PetscCall(ISCreateBlock(comm, 1, n, idx, PETSC_OWN_POINTER, is));
 32:     break;
 33:   }
 34:   PetscFunctionReturn(PETSC_SUCCESS);
 35: }

 37: int main(int argc, char **argv)
 38: {
 39:   IS        is[128];
 40:   IS        tmp;
 41:   PetscInt  n = 10, first = 0, step = 1, offset = 0;
 42:   PetscInt  i, j = 0, type;
 43:   PetscBool verbose = PETSC_FALSE, flg;
 44:   MPI_Comm  comm;

 46:   PetscFunctionBeginUser;
 47:   PetscCall(PetscInitialize(&argc, &argv, NULL, help));
 48:   comm = PETSC_COMM_WORLD;
 49:   PetscCall(PetscArrayzero(is, PETSC_STATIC_ARRAY_LENGTH(is)));
 50:   PetscCall(PetscOptionsGetInt(NULL, NULL, "-n", &n, NULL));
 51:   PetscCall(PetscOptionsGetInt(NULL, NULL, "-first", &first, NULL));
 52:   PetscCall(PetscOptionsGetInt(NULL, NULL, "-step", &step, NULL));
 53:   PetscCall(PetscOptionsGetInt(NULL, NULL, "-offset", &offset, NULL));
 54:   PetscCall(PetscOptionsGetBool(NULL, NULL, "-verbose", &verbose, NULL));

 56:   for (type = 0; type < 3; type++) {
 57:     PetscCall(CreateIS(comm, type, n, first + offset, step, &is[j]));
 58:     j++;

 60:     PetscCall(CreateIS(comm, type, n, first + offset, step, &is[j]));
 61:     PetscCall(ISCopy(is[j], is[j]));
 62:     j++;

 64:     PetscCall(CreateIS(comm, type, n, first + offset, step, &tmp));
 65:     PetscCall(ISDuplicate(tmp, &is[j]));
 66:     PetscCall(ISCopy(tmp, is[j]));
 67:     PetscCall(ISDestroy(&tmp));
 68:     j++;

 70:     PetscCall(CreateIS(comm, type, n, first + offset, step, &is[j]));
 71:     PetscCall(ISShift(is[j], 0, is[j]));
 72:     j++;

 74:     PetscCall(CreateIS(comm, type, n, first, step, &is[j]));
 75:     PetscCall(ISShift(is[j], offset, is[j]));
 76:     j++;

 78:     PetscCall(CreateIS(comm, type, n, first + offset, step, &tmp));
 79:     PetscCall(ISDuplicate(tmp, &is[j]));
 80:     PetscCall(ISShift(tmp, 0, is[j]));
 81:     PetscCall(ISDestroy(&tmp));
 82:     j++;

 84:     PetscCall(CreateIS(comm, type, n, first, step, &tmp));
 85:     PetscCall(ISDuplicate(tmp, &is[j]));
 86:     PetscCall(ISShift(tmp, offset, is[j]));
 87:     PetscCall(ISDestroy(&tmp));
 88:     j++;

 90:     PetscCall(CreateIS(comm, type, n, first + 2 * offset, step, &is[j]));
 91:     PetscCall(ISShift(is[j], -offset, is[j]));
 92:     j++;
 93:   }
 94:   PetscAssert(j < (PetscInt)PETSC_STATIC_ARRAY_LENGTH(is), comm, PETSC_ERR_ARG_OUTOFRANGE, "assertion failed: j < length of is[])");
 95:   PetscCall(ISViewFromOptions(is[0], NULL, "-is0_view"));
 96:   PetscCall(ISViewFromOptions(is[j / 2], NULL, "-is1_view"));
 97:   for (i = 0; i < j; i++) {
 98:     if (!is[i]) continue;
 99:     PetscCall(ISEqualUnsorted(is[i], is[0], &flg));
100:     PetscCheck(flg, comm, PETSC_ERR_PLIB, "is[%02" PetscInt_FMT "] differs from is[0]", i);
101:     if (verbose) PetscCall(PetscPrintf(comm, "is[%02" PetscInt_FMT "] identical to is[0]\n", i));
102:   }
103:   for (i = 0; i < j; i++) PetscCall(ISDestroy(&is[i]));
104:   PetscCall(PetscFinalize());
105:   return 0;
106: }

108: /*TEST

110:     test:
111:       suffix: 1
112:       nsize: 3
113:       args: -n 6 -first {{-2 0 1 3}} -step {{-2 0 1 3}}

115:     test:
116:       suffix: 2
117:       nsize: 2
118:       args: -n 3 -first 2 -step -1 -is0_view -is1_view -verbose

120: TEST*/