1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Tests DMDAGlobalToNaturalAllCreate() using contour plotting for 2d DMDAs.\n\n"; 3c4762a1bSJed Brown 4c4762a1bSJed Brown #include <petscdm.h> 5c4762a1bSJed Brown #include <petscdmda.h> 6c4762a1bSJed Brown #include <petscdraw.h> 7c4762a1bSJed Brown 8d71ae5a4SJacob Faibussowitsch int main(int argc, char **argv) 9d71ae5a4SJacob Faibussowitsch { 10c4762a1bSJed Brown PetscInt i, j, M = 10, N = 8, m = PETSC_DECIDE, n = PETSC_DECIDE; 11c4762a1bSJed Brown PetscMPIInt rank; 12c4762a1bSJed Brown PetscBool flg = PETSC_FALSE; 13c4762a1bSJed Brown DM da; 14c4762a1bSJed Brown PetscViewer viewer; 15c4762a1bSJed Brown Vec localall, global; 16c4762a1bSJed Brown PetscScalar value, *vlocal; 17c4762a1bSJed Brown DMBoundaryType bx = DM_BOUNDARY_NONE, by = DM_BOUNDARY_NONE; 18c4762a1bSJed Brown DMDAStencilType stype = DMDA_STENCIL_BOX; 19c4762a1bSJed Brown VecScatter tolocalall, fromlocalall; 20c4762a1bSJed Brown PetscInt start, end; 21c4762a1bSJed Brown 22327415f7SBarry Smith PetscFunctionBeginUser; 239566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc, &argv, (char *)0, help)); 249566063dSJacob Faibussowitsch PetscCall(PetscViewerDrawOpen(PETSC_COMM_WORLD, 0, "", 300, 0, 300, 300, &viewer)); 25c4762a1bSJed Brown 26c4762a1bSJed Brown /* Read options */ 279566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-M", &M, NULL)); 289566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-N", &N, NULL)); 299566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-m", &m, NULL)); 309566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-n", &n, NULL)); 319566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetBool(NULL, NULL, "-star_stencil", &flg, NULL)); 32c4762a1bSJed Brown if (flg) stype = DMDA_STENCIL_STAR; 33c4762a1bSJed Brown 34c4762a1bSJed Brown /* Create distributed array and get vectors */ 359566063dSJacob Faibussowitsch PetscCall(DMDACreate2d(PETSC_COMM_WORLD, bx, by, stype, M, N, m, n, 1, 1, NULL, NULL, &da)); 369566063dSJacob Faibussowitsch PetscCall(DMSetFromOptions(da)); 379566063dSJacob Faibussowitsch PetscCall(DMSetUp(da)); 38c4762a1bSJed Brown 399566063dSJacob Faibussowitsch PetscCall(DMCreateGlobalVector(da, &global)); 409566063dSJacob Faibussowitsch PetscCall(VecCreateSeq(PETSC_COMM_SELF, M * N, &localall)); 41c4762a1bSJed Brown 429566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank)); 439566063dSJacob Faibussowitsch PetscCall(VecGetOwnershipRange(global, &start, &end)); 44c4762a1bSJed Brown for (i = start; i < end; i++) { 45c4762a1bSJed Brown value = 5.0 * rank; 469566063dSJacob Faibussowitsch PetscCall(VecSetValues(global, 1, &i, &value, INSERT_VALUES)); 47c4762a1bSJed Brown } 48*60211e57SBarry Smith PetscCall(VecAssemblyBegin(global)); 49*60211e57SBarry Smith PetscCall(VecAssemblyEnd(global)); 509566063dSJacob Faibussowitsch PetscCall(VecView(global, viewer)); 51c4762a1bSJed Brown 52c4762a1bSJed Brown /* 53c4762a1bSJed Brown Create Scatter from global DMDA parallel vector to local vector that 54c4762a1bSJed Brown contains all entries 55c4762a1bSJed Brown */ 569566063dSJacob Faibussowitsch PetscCall(DMDAGlobalToNaturalAllCreate(da, &tolocalall)); 579566063dSJacob Faibussowitsch PetscCall(DMDANaturalAllToGlobalCreate(da, &fromlocalall)); 58c4762a1bSJed Brown 599566063dSJacob Faibussowitsch PetscCall(VecScatterBegin(tolocalall, global, localall, INSERT_VALUES, SCATTER_FORWARD)); 609566063dSJacob Faibussowitsch PetscCall(VecScatterEnd(tolocalall, global, localall, INSERT_VALUES, SCATTER_FORWARD)); 61c4762a1bSJed Brown 629566063dSJacob Faibussowitsch PetscCall(VecGetArray(localall, &vlocal)); 63c4762a1bSJed Brown for (j = 0; j < N; j++) { 64ad540459SPierre Jolivet for (i = 0; i < M; i++) *vlocal++ += i + j * M; 65c4762a1bSJed Brown } 669566063dSJacob Faibussowitsch PetscCall(VecRestoreArray(localall, &vlocal)); 67c4762a1bSJed Brown 68c4762a1bSJed Brown /* scatter back to global vector */ 699566063dSJacob Faibussowitsch PetscCall(VecScatterBegin(fromlocalall, localall, global, INSERT_VALUES, SCATTER_FORWARD)); 709566063dSJacob Faibussowitsch PetscCall(VecScatterEnd(fromlocalall, localall, global, INSERT_VALUES, SCATTER_FORWARD)); 71c4762a1bSJed Brown 729566063dSJacob Faibussowitsch PetscCall(VecView(global, viewer)); 73c4762a1bSJed Brown 74c4762a1bSJed Brown /* Free memory */ 759566063dSJacob Faibussowitsch PetscCall(VecScatterDestroy(&tolocalall)); 769566063dSJacob Faibussowitsch PetscCall(VecScatterDestroy(&fromlocalall)); 779566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&viewer)); 789566063dSJacob Faibussowitsch PetscCall(VecDestroy(&localall)); 799566063dSJacob Faibussowitsch PetscCall(VecDestroy(&global)); 809566063dSJacob Faibussowitsch PetscCall(DMDestroy(&da)); 819566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 82b122ec5aSJacob Faibussowitsch return 0; 83c4762a1bSJed Brown } 84c4762a1bSJed Brown 85c4762a1bSJed Brown /*TEST 86c4762a1bSJed Brown 87c4762a1bSJed Brown build: 88c4762a1bSJed Brown requires: !complex 89c4762a1bSJed Brown 90c4762a1bSJed Brown test: 91c4762a1bSJed Brown nsize: 3 92c4762a1bSJed Brown 93c4762a1bSJed Brown TEST*/ 94