1c4762a1bSJed Brown static char help[] = "Tests DMDAGlobalToNaturalAllCreate() using contour plotting for 2d DMDAs.\n\n";
2c4762a1bSJed Brown
3c4762a1bSJed Brown #include <petscdm.h>
4c4762a1bSJed Brown #include <petscdmda.h>
5c4762a1bSJed Brown #include <petscdraw.h>
6c4762a1bSJed Brown
main(int argc,char ** argv)7d71ae5a4SJacob Faibussowitsch int main(int argc, char **argv)
8d71ae5a4SJacob Faibussowitsch {
9c4762a1bSJed Brown PetscInt i, j, M = 10, N = 8, m = PETSC_DECIDE, n = PETSC_DECIDE;
10c4762a1bSJed Brown PetscMPIInt rank;
11c4762a1bSJed Brown PetscBool flg = PETSC_FALSE;
12c4762a1bSJed Brown DM da;
13c4762a1bSJed Brown PetscViewer viewer;
14c4762a1bSJed Brown Vec localall, global;
15c4762a1bSJed Brown PetscScalar value, *vlocal;
16c4762a1bSJed Brown DMBoundaryType bx = DM_BOUNDARY_NONE, by = DM_BOUNDARY_NONE;
17c4762a1bSJed Brown DMDAStencilType stype = DMDA_STENCIL_BOX;
18c4762a1bSJed Brown VecScatter tolocalall, fromlocalall;
19c4762a1bSJed Brown PetscInt start, end;
20c4762a1bSJed Brown
21327415f7SBarry Smith PetscFunctionBeginUser;
22c8025a54SPierre Jolivet PetscCall(PetscInitialize(&argc, &argv, NULL, help));
239566063dSJacob Faibussowitsch PetscCall(PetscViewerDrawOpen(PETSC_COMM_WORLD, 0, "", 300, 0, 300, 300, &viewer));
24c4762a1bSJed Brown
25c4762a1bSJed Brown /* Read options */
269566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-M", &M, NULL));
279566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-N", &N, NULL));
289566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-m", &m, NULL));
299566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-n", &n, NULL));
309566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetBool(NULL, NULL, "-star_stencil", &flg, NULL));
31c4762a1bSJed Brown if (flg) stype = DMDA_STENCIL_STAR;
32c4762a1bSJed Brown
33c4762a1bSJed Brown /* Create distributed array and get vectors */
349566063dSJacob Faibussowitsch PetscCall(DMDACreate2d(PETSC_COMM_WORLD, bx, by, stype, M, N, m, n, 1, 1, NULL, NULL, &da));
359566063dSJacob Faibussowitsch PetscCall(DMSetFromOptions(da));
369566063dSJacob Faibussowitsch PetscCall(DMSetUp(da));
37c4762a1bSJed Brown
389566063dSJacob Faibussowitsch PetscCall(DMCreateGlobalVector(da, &global));
399566063dSJacob Faibussowitsch PetscCall(VecCreateSeq(PETSC_COMM_SELF, M * N, &localall));
40c4762a1bSJed Brown
419566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
429566063dSJacob Faibussowitsch PetscCall(VecGetOwnershipRange(global, &start, &end));
43c4762a1bSJed Brown for (i = start; i < end; i++) {
44c4762a1bSJed Brown value = 5.0 * rank;
459566063dSJacob Faibussowitsch PetscCall(VecSetValues(global, 1, &i, &value, INSERT_VALUES));
46c4762a1bSJed Brown }
4760211e57SBarry Smith PetscCall(VecAssemblyBegin(global));
4860211e57SBarry Smith PetscCall(VecAssemblyEnd(global));
499566063dSJacob Faibussowitsch PetscCall(VecView(global, viewer));
50c4762a1bSJed Brown
51c4762a1bSJed Brown /*
52c4762a1bSJed Brown Create Scatter from global DMDA parallel vector to local vector that
53c4762a1bSJed Brown contains all entries
54c4762a1bSJed Brown */
559566063dSJacob Faibussowitsch PetscCall(DMDAGlobalToNaturalAllCreate(da, &tolocalall));
569566063dSJacob Faibussowitsch PetscCall(DMDANaturalAllToGlobalCreate(da, &fromlocalall));
57c4762a1bSJed Brown
589566063dSJacob Faibussowitsch PetscCall(VecScatterBegin(tolocalall, global, localall, INSERT_VALUES, SCATTER_FORWARD));
599566063dSJacob Faibussowitsch PetscCall(VecScatterEnd(tolocalall, global, localall, INSERT_VALUES, SCATTER_FORWARD));
60c4762a1bSJed Brown
619566063dSJacob Faibussowitsch PetscCall(VecGetArray(localall, &vlocal));
62c4762a1bSJed Brown for (j = 0; j < N; j++) {
63ad540459SPierre Jolivet for (i = 0; i < M; i++) *vlocal++ += i + j * M;
64c4762a1bSJed Brown }
659566063dSJacob Faibussowitsch PetscCall(VecRestoreArray(localall, &vlocal));
66c4762a1bSJed Brown
67c4762a1bSJed Brown /* scatter back to global vector */
689566063dSJacob Faibussowitsch PetscCall(VecScatterBegin(fromlocalall, localall, global, INSERT_VALUES, SCATTER_FORWARD));
699566063dSJacob Faibussowitsch PetscCall(VecScatterEnd(fromlocalall, localall, global, INSERT_VALUES, SCATTER_FORWARD));
70c4762a1bSJed Brown
719566063dSJacob Faibussowitsch PetscCall(VecView(global, viewer));
72c4762a1bSJed Brown
73c4762a1bSJed Brown /* Free memory */
749566063dSJacob Faibussowitsch PetscCall(VecScatterDestroy(&tolocalall));
759566063dSJacob Faibussowitsch PetscCall(VecScatterDestroy(&fromlocalall));
769566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&viewer));
779566063dSJacob Faibussowitsch PetscCall(VecDestroy(&localall));
789566063dSJacob Faibussowitsch PetscCall(VecDestroy(&global));
799566063dSJacob Faibussowitsch PetscCall(DMDestroy(&da));
809566063dSJacob Faibussowitsch PetscCall(PetscFinalize());
81b122ec5aSJacob Faibussowitsch return 0;
82c4762a1bSJed Brown }
83c4762a1bSJed Brown
84c4762a1bSJed Brown /*TEST
85c4762a1bSJed Brown
86c4762a1bSJed Brown build:
87c4762a1bSJed Brown requires: !complex
88c4762a1bSJed Brown
89c4762a1bSJed Brown test:
90c4762a1bSJed Brown nsize: 3
91*3886731fSPierre Jolivet output_file: output/empty.out
92c4762a1bSJed Brown
93c4762a1bSJed Brown TEST*/
94