Actual source code: ex15.c


  2: static char help[] = "Tests Mathematica I/O of vectors and illustrates the use of user-defined event logging.\n\n";

  4: #include <petscvec.h>

  6: /* Note:  Most applications would not read and write a vector within
  7:   the same program.  This example is intended only to demonstrate
  8:   both input and output. */

 10: int main(int argc, char *argv[])
 11: {
 12:   PetscViewer viewer;
 13:   Vec         u;
 14:   PetscScalar v;
 15:   int         VECTOR_GENERATE, VECTOR_READ;
 16:   int         i, m = 10, rank, size, low, high, ldim, iglobal;
 17:   int         ierr;

 19:   PetscFunctionBeginUser;
 20:   PetscCall(PetscInitialize(&argc, &argv, NULL, help));
 21:   PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
 22:   PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));
 23:   PetscCall(PetscOptionsGetInt(NULL, NULL, "-m", &m, NULL));

 25:   /* PART 1:  Generate vector, then write it to Mathematica */

 27:   PetscCall(PetscLogEventRegister("Generate Vector", VEC_CLASSID, &VECTOR_GENERATE));
 28:   PetscCall(PetscLogEventBegin(VECTOR_GENERATE, 0, 0, 0, 0));
 29:   /* Generate vector */
 30:   PetscCall(VecCreate(PETSC_COMM_WORLD, &u));
 31:   PetscCall(VecSetSizes(u, PETSC_DECIDE, m));
 32:   PetscCall(VecSetFromOptions(u));
 33:   PetscCall(VecGetOwnershipRange(u, &low, &high));
 34:   PetscCall(VecGetLocalSize(u, &ldim));
 35:   for (i = 0; i < ldim; i++) {
 36:     iglobal = i + low;
 37:     v       = (PetscScalar)(i + 100 * rank);
 38:     PetscCall(VecSetValues(u, 1, &iglobal, &v, INSERT_VALUES));
 39:   }
 40:   PetscCall(VecAssemblyBegin(u));
 41:   PetscCall(VecAssemblyEnd(u));
 42:   PetscCall(VecView(u, PETSC_VIEWER_STDOUT_WORLD));

 44:   PetscCall(PetscPrintf(PETSC_COMM_WORLD, "writing vector to Mathematica...\n"));

 46: #if 0
 47:   PetscCall(PetscViewerMathematicaOpen(PETSC_COMM_WORLD, 8000, "192.168.119.1", "Connect", &viewer));
 48:   PetscCall(VecView(u, viewer));
 49: #else
 50:   PetscCall(VecView(u, PETSC_VIEWER_MATHEMATICA_WORLD));
 51: #endif
 52:   v = 0.0;
 53:   PetscCall(VecSet(u, v));
 54:   PetscCall(PetscLogEventEnd(VECTOR_GENERATE, 0, 0, 0, 0));

 56:   /* All processors wait until test vector has been dumped */
 57:   PetscCallMPI(MPI_Barrier(PETSC_COMM_WORLD));
 58:   PetscCall(PetscSleep(10));

 60:   /* PART 2:  Read in vector in from Mathematica */

 62:   PetscCall(PetscLogEventRegister("Read Vector", VEC_CLASSID, &VECTOR_READ));
 63:   PetscCall(PetscLogEventBegin(VECTOR_READ, 0, 0, 0, 0));
 64:   PetscCall(PetscPrintf(PETSC_COMM_WORLD, "reading vector from Mathematica...\n"));
 65:   /* Read new vector in binary format */
 66: #if 0
 67:   PetscCall(PetscViewerMathematicaGetVector(viewer, u));
 68:   PetscCall(PetscViewerDestroy(&viewer));
 69: #else
 70:   PetscCall(PetscViewerMathematicaGetVector(PETSC_VIEWER_MATHEMATICA_WORLD, u));
 71: #endif
 72:   PetscCall(PetscLogEventEnd(VECTOR_READ, 0, 0, 0, 0));
 73:   PetscCall(VecView(u, PETSC_VIEWER_STDOUT_WORLD));

 75:   /* Free data structures */
 76:   PetscCall(VecDestroy(&u));
 77:   PetscCall(PetscFinalize());
 78:   return 0;
 79: }