1 const char help[] = "Test clearing stale AMR data (example contributed by Berend van Wachem)"; 2 3 #include <petscdmplex.h> 4 #include <petscdmforest.h> 5 6 PetscErrorCode CloneDMWithNewSection(DM OriginalDM, DM *NewDM, PetscInt NFields) 7 { 8 PetscSection section; 9 PetscInt *NumComp, *NumDof; 10 11 PetscFunctionBegin; 12 PetscCall(DMClone(OriginalDM, NewDM)); 13 PetscCall(DMPlexDistributeSetDefault(*NewDM, PETSC_FALSE)); 14 PetscCall(DMClearDS(*NewDM)); 15 PetscCall(PetscCalloc2(1, &NumComp, 3, &NumDof)); 16 NumComp[0] = 1; 17 NumDof[2] = NFields; 18 PetscCall(DMSetNumFields(*NewDM, 1)); 19 PetscCall(DMSetFromOptions(*NewDM)); 20 PetscCall(DMPlexCreateSection(*NewDM, NULL, NumComp, NumDof, 0, NULL, NULL, NULL, NULL, §ion)); 21 PetscCall(DMSetLocalSection(*NewDM, section)); 22 PetscCall(PetscFree2(NumComp, NumDof)); 23 PetscCall(PetscSectionDestroy(§ion)); 24 PetscFE fe; 25 PetscCall(PetscFECreateDefault(PETSC_COMM_WORLD, 2, 1, PETSC_FALSE, NULL, PETSC_DEFAULT, &fe)); 26 PetscCall(DMSetField(*NewDM, 0, NULL, (PetscObject)fe)); 27 PetscCall(PetscFEDestroy(&fe)); 28 PetscCall(DMCreateDS(*NewDM)); 29 PetscFunctionReturn(PETSC_SUCCESS); 30 } 31 32 int main(int argc, char **argv) 33 { 34 PetscInt dim = 2; 35 PetscInt cells_per_dir[] = {1, 1}; 36 PetscReal dir_min[] = {0.0, 0.0}; 37 PetscReal dir_max[] = {1.0, 1.0}; 38 DMBoundaryType bcs[] = {DM_BOUNDARY_NONE, DM_BOUNDARY_NONE}; 39 DM forest, plex, NewDM; 40 Vec NewDMVecGlobal, NewDMVecLocal; 41 42 PetscFunctionBeginUser; 43 PetscCall(PetscInitialize(&argc, &argv, NULL, help)); 44 PetscCall(DMCreate(PETSC_COMM_WORLD, &forest)); 45 PetscCall(DMSetType(forest, DMP4EST)); 46 { 47 DM dm_base; 48 PetscCall(DMPlexCreateBoxMesh(PETSC_COMM_WORLD, dim, /* simplex */ PETSC_FALSE, cells_per_dir, dir_min, dir_max, bcs, /* interpolate */ PETSC_TRUE, 0, PETSC_TRUE, &dm_base)); 49 PetscCall(DMSetFromOptions(dm_base)); 50 PetscCall(DMViewFromOptions(dm_base, NULL, "-dm_base_view")); 51 PetscCall(DMCopyFields(dm_base, PETSC_DETERMINE, PETSC_DETERMINE, forest)); 52 PetscCall(DMForestSetBaseDM(forest, dm_base)); 53 PetscCall(DMDestroy(&dm_base)); 54 } 55 PetscCall(DMSetFromOptions(forest)); 56 PetscCall(DMSetUp(forest)); 57 58 PetscCall(DMViewFromOptions(forest, NULL, "-dm_forest_view")); 59 60 PetscCall(DMConvert(forest, DMPLEX, &plex)); 61 62 PetscInt numFields = 2; 63 PetscInt numComp[2] = {1, 1}; 64 PetscInt numDof[6] = {0}; 65 for (PetscInt i = 0; i < numFields; i++) numDof[i * (dim + 1) + dim] = 1; 66 67 PetscCall(DMSetNumFields(plex, numFields)); 68 PetscCall(DMSetNumFields(forest, numFields)); 69 70 PetscSection section; 71 PetscCall(DMPlexCreateSection(plex, NULL, numComp, numDof, 0, NULL, NULL, NULL, NULL, §ion)); 72 73 const char *names[] = {"field 0", "field 1"}; 74 for (PetscInt i = 0; i < numFields; i++) PetscCall(PetscSectionSetFieldName(section, i, names[i])); 75 PetscCall(DMSetLocalSection(forest, section)); 76 PetscCall(DMSetLocalSection(plex, section)); 77 PetscCall(PetscSectionDestroy(§ion)); 78 79 PetscFE fe; 80 PetscCall(PetscFECreateDefault(PETSC_COMM_WORLD, dim, 1, PETSC_FALSE, NULL, PETSC_DEFAULT, &fe)); 81 for (PetscInt i = 0; i < numFields; i++) { 82 PetscCall(DMSetField(plex, i, NULL, (PetscObject)fe)); 83 PetscCall(DMSetField(forest, i, NULL, (PetscObject)fe)); 84 } 85 PetscCall(PetscFEDestroy(&fe)); 86 87 PetscCall(DMCreateDS(plex)); 88 PetscCall(DMCreateDS(forest)); 89 90 /* Make another DM, based on the layout of the previous DM, but with a different number of fields */ 91 PetscCall(CloneDMWithNewSection(plex, &NewDM, 1)); 92 PetscCall(DMCreateDS(NewDM)); 93 PetscCall(DMCreateGlobalVector(NewDM, &NewDMVecGlobal)); 94 PetscCall(DMCreateLocalVector(NewDM, &NewDMVecLocal)); 95 PetscCall(VecSet(NewDMVecGlobal, 3.141592)); 96 PetscCall(DMGlobalToLocal(NewDM, NewDMVecGlobal, INSERT_VALUES, NewDMVecLocal)); 97 PetscCall(VecDestroy(&NewDMVecLocal)); 98 PetscCall(VecDestroy(&NewDMVecGlobal)); 99 PetscCall(DMClearDS(NewDM)); 100 PetscCall(DMDestroy(&NewDM)); 101 102 Vec g_vec, l_vec; 103 PetscCall(DMCreateGlobalVector(plex, &g_vec)); 104 PetscCall(VecSet(g_vec, 1.0)); 105 PetscCall(DMCreateLocalVector(plex, &l_vec)); 106 PetscCall(DMGlobalToLocal(plex, g_vec, INSERT_VALUES, l_vec)); 107 PetscCall(VecViewFromOptions(l_vec, NULL, "-local_vec_view")); 108 PetscCall(VecDestroy(&l_vec)); 109 PetscCall(VecDestroy(&g_vec)); 110 111 PetscCall(DMViewFromOptions(forest, NULL, "-dm_plex_view")); 112 PetscCall(DMDestroy(&plex)); 113 PetscCall(DMDestroy(&forest)); 114 PetscCall(PetscFinalize()); 115 return 0; 116 } 117 118 /*TEST 119 120 test: 121 suffix: 0 122 requires: p4est 123 args: -dm_forest_initial_refinement 1 -dm_forest_maximum_refinement 4 -dm_p4est_refine_pattern hash 124 output_file: output/empty.out 125 126 TEST*/ 127