Actual source code: ex15.c
1: static char help[] = "Tests Mathematica I/O of vectors and illustrates the use of user-defined event logging.\n\n";
3: #include <petscvec.h>
5: /* Note: Most applications would not read and write a vector within
6: the same program. This example is intended only to demonstrate
7: both input and output. */
9: int main(int argc, char *argv[])
10: {
11: PetscViewer viewer;
12: Vec u;
13: PetscScalar v;
14: int VECTOR_GENERATE, VECTOR_READ;
15: int i, m = 10, rank, size, low, high, ldim, iglobal;
16: int ierr;
18: PetscFunctionBeginUser;
19: PetscCall(PetscInitialize(&argc, &argv, NULL, help));
20: PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
21: PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));
22: PetscCall(PetscOptionsGetInt(NULL, NULL, "-m", &m, NULL));
24: /* PART 1: Generate vector, then write it to Mathematica */
26: PetscCall(PetscLogEventRegister("Generate Vector", VEC_CLASSID, &VECTOR_GENERATE));
27: PetscCall(PetscLogEventBegin(VECTOR_GENERATE, 0, 0, 0, 0));
28: /* Generate vector */
29: PetscCall(VecCreate(PETSC_COMM_WORLD, &u));
30: PetscCall(VecSetSizes(u, PETSC_DECIDE, m));
31: PetscCall(VecSetFromOptions(u));
32: PetscCall(VecGetOwnershipRange(u, &low, &high));
33: PetscCall(VecGetLocalSize(u, &ldim));
34: for (i = 0; i < ldim; i++) {
35: iglobal = i + low;
36: v = (PetscScalar)(i + 100 * rank);
37: PetscCall(VecSetValues(u, 1, &iglobal, &v, INSERT_VALUES));
38: }
39: PetscCall(VecAssemblyBegin(u));
40: PetscCall(VecAssemblyEnd(u));
41: PetscCall(VecView(u, PETSC_VIEWER_STDOUT_WORLD));
43: PetscCall(PetscPrintf(PETSC_COMM_WORLD, "writing vector to Mathematica...\n"));
45: #if 0
46: PetscCall(PetscViewerMathematicaOpen(PETSC_COMM_WORLD, 8000, "192.168.119.1", "Connect", &viewer));
47: PetscCall(VecView(u, viewer));
48: #else
49: PetscCall(VecView(u, PETSC_VIEWER_MATHEMATICA_WORLD));
50: #endif
51: v = 0.0;
52: PetscCall(VecSet(u, v));
53: PetscCall(PetscLogEventEnd(VECTOR_GENERATE, 0, 0, 0, 0));
55: /* All processors wait until test vector has been dumped */
56: PetscCallMPI(MPI_Barrier(PETSC_COMM_WORLD));
57: PetscCall(PetscSleep(10));
59: /* PART 2: Read in vector in from Mathematica */
61: PetscCall(PetscLogEventRegister("Read Vector", VEC_CLASSID, &VECTOR_READ));
62: PetscCall(PetscLogEventBegin(VECTOR_READ, 0, 0, 0, 0));
63: PetscCall(PetscPrintf(PETSC_COMM_WORLD, "reading vector from Mathematica...\n"));
64: /* Read new vector in binary format */
65: #if 0
66: PetscCall(PetscViewerMathematicaGetVector(viewer, u));
67: PetscCall(PetscViewerDestroy(&viewer));
68: #else
69: PetscCall(PetscViewerMathematicaGetVector(PETSC_VIEWER_MATHEMATICA_WORLD, u));
70: #endif
71: PetscCall(PetscLogEventEnd(VECTOR_READ, 0, 0, 0, 0));
72: PetscCall(VecView(u, PETSC_VIEWER_STDOUT_WORLD));
74: /* Free data structures */
75: PetscCall(VecDestroy(&u));
76: PetscCall(PetscFinalize());
77: return 0;
78: }