Actual source code: ex15.c

petsc-master 2017-07-18
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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);
 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: }