1 2 static char help[] = "Tests DMDAGlobalToNaturalAllCreate() using contour plotting for 2d DMDAs.\n\n"; 3 4 #include <petscdm.h> 5 #include <petscdmda.h> 6 #include <petscdraw.h> 7 8 int main(int argc,char **argv) 9 { 10 PetscInt i,j,M = 10,N = 8,m = PETSC_DECIDE,n = PETSC_DECIDE; 11 PetscMPIInt rank; 12 PetscErrorCode ierr; 13 PetscBool flg = PETSC_FALSE; 14 DM da; 15 PetscViewer viewer; 16 Vec localall,global; 17 PetscScalar value,*vlocal; 18 DMBoundaryType bx = DM_BOUNDARY_NONE,by = DM_BOUNDARY_NONE; 19 DMDAStencilType stype = DMDA_STENCIL_BOX; 20 VecScatter tolocalall,fromlocalall; 21 PetscInt start,end; 22 23 ierr = PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr; 24 ierr = PetscViewerDrawOpen(PETSC_COMM_WORLD,0,"",300,0,300,300,&viewer);CHKERRQ(ierr); 25 26 /* Read options */ 27 ierr = PetscOptionsGetInt(NULL,NULL,"-M",&M,NULL);CHKERRQ(ierr); 28 ierr = PetscOptionsGetInt(NULL,NULL,"-N",&N,NULL);CHKERRQ(ierr); 29 ierr = PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL);CHKERRQ(ierr); 30 ierr = PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);CHKERRQ(ierr); 31 ierr = PetscOptionsGetBool(NULL,NULL,"-star_stencil",&flg,NULL);CHKERRQ(ierr); 32 if (flg) stype = DMDA_STENCIL_STAR; 33 34 /* Create distributed array and get vectors */ 35 ierr = DMDACreate2d(PETSC_COMM_WORLD,bx,by,stype,M,N,m,n,1,1,NULL,NULL,&da);CHKERRQ(ierr); 36 ierr = DMSetFromOptions(da);CHKERRQ(ierr); 37 ierr = DMSetUp(da);CHKERRQ(ierr); 38 39 ierr = DMCreateGlobalVector(da,&global);CHKERRQ(ierr); 40 ierr = VecCreateSeq(PETSC_COMM_SELF,M*N,&localall);CHKERRQ(ierr); 41 42 ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRMPI(ierr); 43 ierr = VecGetOwnershipRange(global,&start,&end);CHKERRQ(ierr); 44 for (i=start; i<end; i++) { 45 value = 5.0*rank; 46 ierr = VecSetValues(global,1,&i,&value,INSERT_VALUES);CHKERRQ(ierr); 47 } 48 ierr = VecView(global,viewer);CHKERRQ(ierr); 49 50 /* 51 Create Scatter from global DMDA parallel vector to local vector that 52 contains all entries 53 */ 54 ierr = DMDAGlobalToNaturalAllCreate(da,&tolocalall);CHKERRQ(ierr); 55 ierr = DMDANaturalAllToGlobalCreate(da,&fromlocalall);CHKERRQ(ierr); 56 57 ierr = VecScatterBegin(tolocalall,global,localall,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 58 ierr = VecScatterEnd(tolocalall,global,localall,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 59 60 ierr = VecGetArray(localall,&vlocal);CHKERRQ(ierr); 61 for (j=0; j<N; j++) { 62 for (i=0; i<M; i++) { 63 *vlocal++ += i + j*M; 64 } 65 } 66 ierr = VecRestoreArray(localall,&vlocal);CHKERRQ(ierr); 67 68 /* scatter back to global vector */ 69 ierr = VecScatterBegin(fromlocalall,localall,global,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 70 ierr = VecScatterEnd(fromlocalall,localall,global,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 71 72 ierr = VecView(global,viewer);CHKERRQ(ierr); 73 74 /* Free memory */ 75 ierr = VecScatterDestroy(&tolocalall);CHKERRQ(ierr); 76 ierr = VecScatterDestroy(&fromlocalall);CHKERRQ(ierr); 77 ierr = PetscViewerDestroy(&viewer);CHKERRQ(ierr); 78 ierr = VecDestroy(&localall);CHKERRQ(ierr); 79 ierr = VecDestroy(&global);CHKERRQ(ierr); 80 ierr = DMDestroy(&da);CHKERRQ(ierr); 81 ierr = PetscFinalize(); 82 return ierr; 83 } 84 85 /*TEST 86 87 build: 88 requires: !complex 89 90 test: 91 nsize: 3 92 93 TEST*/ 94