1c4762a1bSJed Brown static char help[] = "Demonstrates the DMLocalToLocal bug in PETSc 3.6.\n\n"; 2c4762a1bSJed Brown 3c4762a1bSJed Brown /* 4c4762a1bSJed Brown Use the options 5c4762a1bSJed Brown -da_grid_x <nx> - number of grid points in x direction, if M < 0 6c4762a1bSJed Brown -da_grid_y <ny> - number of grid points in y direction, if N < 0 7c4762a1bSJed Brown -da_processors_x <MX> number of processors in x directio 8c4762a1bSJed Brown -da_processors_y <MY> number of processors in x direction 9c4762a1bSJed Brown 10c4762a1bSJed Brown Contributed by Constantine Khroulev 11c4762a1bSJed Brown */ 12c4762a1bSJed Brown 13c4762a1bSJed Brown #include <petscdm.h> 14c4762a1bSJed Brown #include <petscdmda.h> 15c4762a1bSJed Brown 16c4762a1bSJed Brown PetscErrorCode PrintVecWithGhosts(DM da, Vec v) 17c4762a1bSJed Brown { 18c4762a1bSJed Brown PetscScalar **p; 19c4762a1bSJed Brown PetscInt i, j; 20c4762a1bSJed Brown MPI_Comm com; 21c4762a1bSJed Brown PetscMPIInt rank; 22c4762a1bSJed Brown DMDALocalInfo info; 23c4762a1bSJed Brown 24c4762a1bSJed Brown com = PetscObjectComm((PetscObject)da); 259566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_rank(com, &rank)); 269566063dSJacob Faibussowitsch PetscCall(DMDAGetLocalInfo(da, &info)); 27*63a3b9bcSJacob Faibussowitsch PetscCall(PetscSynchronizedPrintf(com, "begin rank %d portion (with ghosts, %" PetscInt_FMT " x %" PetscInt_FMT ")\n",rank, info.gxm, info.gym)); 289566063dSJacob Faibussowitsch PetscCall(DMDAVecGetArray(da, v, &p)); 29c4762a1bSJed Brown for (i = info.gxs; i < info.gxs + info.gxm; i++) { 30c4762a1bSJed Brown for (j = info.gys; j < info.gys + info.gym; j++) { 319566063dSJacob Faibussowitsch PetscCall(PetscSynchronizedPrintf(com, "%g, ", (double) PetscRealPart(p[j][i]))); 32c4762a1bSJed Brown } 339566063dSJacob Faibussowitsch PetscCall(PetscSynchronizedPrintf(com, "\n")); 34c4762a1bSJed Brown } 359566063dSJacob Faibussowitsch PetscCall(DMDAVecRestoreArray(da, v, &p)); 369566063dSJacob Faibussowitsch PetscCall(PetscSynchronizedPrintf(com, "end rank %d portion\n", rank)); 379566063dSJacob Faibussowitsch PetscCall(PetscSynchronizedFlush(com, PETSC_STDOUT)); 38c4762a1bSJed Brown return 0; 39c4762a1bSJed Brown } 40c4762a1bSJed Brown 41c4762a1bSJed Brown /* Set a Vec v to value, but do not touch ghosts. */ 42c4762a1bSJed Brown PetscErrorCode VecSetOwned(DM da, Vec v, PetscScalar value) 43c4762a1bSJed Brown { 44c4762a1bSJed Brown PetscScalar **p; 45c4762a1bSJed Brown PetscInt i, j, xs, xm, ys, ym; 46c4762a1bSJed Brown 479566063dSJacob Faibussowitsch PetscCall(DMDAGetCorners(da, &xs, &ys, 0, &xm, &ym, 0)); 489566063dSJacob Faibussowitsch PetscCall(DMDAVecGetArray(da, v, &p)); 49c4762a1bSJed Brown for (i = xs; i < xs + xm; i++) { 50c4762a1bSJed Brown for (j = ys; j < ys + ym; j++) { 51c4762a1bSJed Brown p[j][i] = value; 52c4762a1bSJed Brown } 53c4762a1bSJed Brown } 549566063dSJacob Faibussowitsch PetscCall(DMDAVecRestoreArray(da, v, &p)); 55c4762a1bSJed Brown return 0; 56c4762a1bSJed Brown } 57c4762a1bSJed Brown 58c4762a1bSJed Brown int main(int argc, char **argv) 59c4762a1bSJed Brown { 60c4762a1bSJed Brown PetscInt M = 4, N = 3; 61c4762a1bSJed Brown DM da; 62c4762a1bSJed Brown Vec local; 63c4762a1bSJed Brown PetscScalar value = 0.0; 64c4762a1bSJed Brown DMBoundaryType bx = DM_BOUNDARY_PERIODIC, by = DM_BOUNDARY_PERIODIC; 65c4762a1bSJed Brown DMDAStencilType stype = DMDA_STENCIL_BOX; 66c4762a1bSJed Brown 679566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc, &argv, (char*)0, help)); 689566063dSJacob Faibussowitsch PetscCall(DMDACreate2d(PETSC_COMM_WORLD,bx,by,stype,M,N,PETSC_DECIDE,PETSC_DECIDE,1,1,NULL,NULL,&da)); 699566063dSJacob Faibussowitsch PetscCall(DMSetFromOptions(da)); 709566063dSJacob Faibussowitsch PetscCall(DMSetUp(da)); 719566063dSJacob Faibussowitsch PetscCall(DMCreateLocalVector(da, &local)); 72c4762a1bSJed Brown 739566063dSJacob Faibussowitsch PetscCall(VecSet(local, value)); 749566063dSJacob Faibussowitsch PetscCall(PetscPrintf(PETSC_COMM_WORLD, "\nAfter setting all values to %d:\n", (int)PetscRealPart(value))); 759566063dSJacob Faibussowitsch PetscCall(PrintVecWithGhosts(da, local)); 769566063dSJacob Faibussowitsch PetscCall(PetscPrintf(PETSC_COMM_WORLD, "done\n")); 77c4762a1bSJed Brown 78c4762a1bSJed Brown value += 1.0; 79c4762a1bSJed Brown /* set values owned by a process, leaving ghosts alone */ 809566063dSJacob Faibussowitsch PetscCall(VecSetOwned(da, local, value)); 81c4762a1bSJed Brown 82c4762a1bSJed Brown /* print after re-setting interior values again */ 839566063dSJacob Faibussowitsch PetscCall(PetscPrintf(PETSC_COMM_WORLD, "\nAfter setting interior values to %d:\n", (int)PetscRealPart(value))); 849566063dSJacob Faibussowitsch PetscCall(PrintVecWithGhosts(da, local)); 859566063dSJacob Faibussowitsch PetscCall(PetscPrintf(PETSC_COMM_WORLD, "done\n")); 86c4762a1bSJed Brown 87c4762a1bSJed Brown /* communicate ghosts */ 889566063dSJacob Faibussowitsch PetscCall(DMLocalToLocalBegin(da, local, INSERT_VALUES, local)); 899566063dSJacob Faibussowitsch PetscCall(DMLocalToLocalEnd(da, local, INSERT_VALUES, local)); 90c4762a1bSJed Brown 91c4762a1bSJed Brown /* print again */ 929566063dSJacob Faibussowitsch PetscCall(PetscPrintf(PETSC_COMM_WORLD, "\nAfter local-to-local communication:\n")); 939566063dSJacob Faibussowitsch PetscCall(PrintVecWithGhosts(da, local)); 949566063dSJacob Faibussowitsch PetscCall(PetscPrintf(PETSC_COMM_WORLD, "done\n")); 95c4762a1bSJed Brown 96c4762a1bSJed Brown /* Free memory */ 979566063dSJacob Faibussowitsch PetscCall(VecDestroy(&local)); 989566063dSJacob Faibussowitsch PetscCall(DMDestroy(&da)); 999566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 100b122ec5aSJacob Faibussowitsch return 0; 101c4762a1bSJed Brown } 102c4762a1bSJed Brown 103c4762a1bSJed Brown /*TEST 104c4762a1bSJed Brown 105c4762a1bSJed Brown test: 106c4762a1bSJed Brown nsize: 2 107c4762a1bSJed Brown 108c4762a1bSJed Brown TEST*/ 109