Actual source code: ex1.c
petsc-3.12.4 2020-02-04
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      1: static char help[] = "Make a 2D grid of patches and view them\n\n";

      3: /*
      4: Serial Test
      5: Parallel Test where all zooms are serials
      6: Parallel Test where zooms are parallel

      8: Return DMPatch from Zoom
      9: Override refine from DMPatch to split cells
     10:  */
     11:  #include <petscdmpatch.h>

     13: typedef struct {
     14:   PetscInt   debug;     /* The debugging level */
     15:   PetscInt   dim;       /* The spatial dimension */
     16:   MatStencil patchSize; /* Size of patches */
     17:   MatStencil gridSize;  /* Size of patch grid */
     18:   MatStencil commSize;  /* Size of patch comm */
     19: } AppCtx;

     21: PetscErrorCode ProcessOptions(MPI_Comm comm, AppCtx *options)
     22: {
     23:   PetscInt       patchSize, commSize, gridSize;

     27:   options->debug = 0;
     28:   options->dim   = 2;
     29:   patchSize      = 0;
     30:   commSize       = 0;
     31:   gridSize       = 0;

     33:   PetscOptionsBegin(comm, "", "Patch Test Options", "DMPATCH");
     34:   PetscOptionsBoundedInt("-debug", "The debugging level", "ex1.c", options->debug, &options->debug, NULL,0);
     35:   PetscOptionsRangeInt("-dim", "The spatial dimension", "ex1.c", options->dim, &options->dim, NULL,1,3);
     36:   PetscOptionsBoundedInt("-patch_size", "The patch size in each dimension", "ex1.c", patchSize, &patchSize, NULL,0);
     37:   PetscOptionsBoundedInt("-comm_size", "The comm size in each dimension", "ex1.c", commSize, &commSize, NULL,0);
     38:   PetscOptionsBoundedInt("-grid_size", "The grid size in each dimension", "ex1.c", gridSize, &gridSize, NULL,1);
     39:   PetscOptionsEnd();

     41:   options->patchSize.i = options->patchSize.j = options->patchSize.k = 1;
     42:   options->commSize.i  = options->commSize.j  = options->commSize.k = 1;
     43:   options->gridSize.i  = options->gridSize.j  = options->gridSize.k = 1;
     44:   if (options->dim > 0) {options->patchSize.i = patchSize; options->commSize.i = commSize; options->gridSize.i = gridSize;}
     45:   if (options->dim > 1) {options->patchSize.j = patchSize; options->commSize.j = commSize; options->gridSize.j = gridSize;}
     46:   if (options->dim > 2) {options->patchSize.k = patchSize; options->commSize.k = commSize; options->gridSize.k = gridSize;}
     47:   return(0);
     48: };

     50: int main(int argc, char **argv)
     51: {
     52:   DM             dm;
     53:   AppCtx         user;                 /* user-defined work context */

     56:   PetscInitialize(&argc, &argv, NULL, help);if (ierr) return ierr;
     57:   ProcessOptions(PETSC_COMM_WORLD, &user);
     58:   DMPatchCreateGrid(PETSC_COMM_WORLD, user.dim, user.patchSize, user.commSize, user.gridSize, &dm);
     59:   PetscObjectSetName((PetscObject) dm, "Patch Mesh");
     60:   DMSetFromOptions(dm);
     61:   DMSetUp(dm);
     62:   DMView(dm, PETSC_VIEWER_STDOUT_WORLD);
     63:   DMPatchSolve(dm);
     64:   DMDestroy(&dm);
     65:   PetscFinalize();
     66:   return ierr;
     67: }