Actual source code: ex15.c
petsc-3.13.6 2020-09-29
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      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:   PetscInitialize(&argc, &argv, NULL, help);if (ierr) return ierr;
     20:   MPI_Comm_rank(PETSC_COMM_WORLD, &rank);
     21:   MPI_Comm_size(PETSC_COMM_WORLD, &size);
     22:   PetscOptionsGetInt(NULL,NULL, "-m", &m, NULL);

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

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

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

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

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

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

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

     74:   /* Free data structures */
     75:   VecDestroy(&u);
     76:   PetscFinalize();
     77:   return ierr;
     78: }