Actual source code: ex58.c

  1: static char help[] = "Tests PetscGlobalMinMax\n\n";

  3: #include <petscsys.h>

  5: int main(int argc, char **argv)
  6: {
  7:   PetscMPIInt size, rank;
  8:   PetscInt    li[2], gi[2] = {-1, -1};
  9:   PetscReal   lr[2], gr[2] = {-1., -1.};

 11:   PetscFunctionBeginUser;
 12:   PetscCall(PetscInitialize(&argc, &argv, NULL, help));
 13:   PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));
 14:   PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));

 16:   li[0] = 4 + rank;
 17:   li[1] = -3 + size - rank;
 18:   PetscCall(PetscGlobalMinMaxInt(PETSC_COMM_WORLD, li, gi));
 19:   if (gi[0] != 4 || gi[1] != -3 + size) PetscCall(PetscPrintf(PETSC_COMM_SELF, "1) Error MIN/MAX %" PetscInt_FMT " %" PetscInt_FMT "\n", gi[0], gi[1]));
 20:   PetscCall(PetscGlobalMinMaxInt(PETSC_COMM_WORLD, li, li));
 21:   if (li[0] != gi[0] || li[1] != gi[1]) PetscCall(PetscPrintf(PETSC_COMM_SELF, "2) Error MIN/MAX %" PetscInt_FMT " %" PetscInt_FMT "\n", li[0], li[1]));

 23:   if (rank == 0) {
 24:     li[0] = PETSC_INT_MAX;
 25:     li[1] = PETSC_INT_MIN;
 26:   } else if (rank == 1) {
 27:     li[0] = PETSC_INT_MIN;
 28:     li[1] = PETSC_INT_MAX;
 29:   }

 31:   PetscCall(PetscGlobalMinMaxInt(PETSC_COMM_WORLD, li, gi));
 32:   if (gi[0] > li[0] || gi[1] < li[1]) PetscCall(PetscPrintf(PETSC_COMM_SELF, "3) Error MIN/MAX %" PetscInt_FMT " %" PetscInt_FMT "\n", gi[0], gi[1]));

 34:   lr[0] = 4.0 + rank;
 35:   lr[1] = -3.0 + size - rank;
 36:   PetscCall(PetscGlobalMinMaxReal(PETSC_COMM_WORLD, lr, gr));
 37:   if (gr[0] != 4.0 || gr[1] != -3.0 + size) PetscCall(PetscPrintf(PETSC_COMM_SELF, "4) Error MIN/MAX %g %g\n", (double)gr[0], (double)gr[1]));
 38:   PetscCall(PetscGlobalMinMaxReal(PETSC_COMM_WORLD, lr, lr));
 39:   if (lr[0] != gr[0] || lr[1] != gr[1]) PetscCall(PetscPrintf(PETSC_COMM_SELF, "5) Error MIN/MAX %g %g\n", (double)lr[0], (double)li[1]));

 41:   PetscCall(PetscFinalize());
 42:   return 0;
 43: }

 45: /*TEST

 47:    test:
 48:      output_file: output/ex58_1.out

 50:    test:
 51:      suffix: 2
 52:      output_file: output/ex58_1.out
 53:      nsize: 2

 55: TEST*/