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: }