1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Show MatShift BUG happening after copying a matrix with no rows on a process"; 3c4762a1bSJed Brown /* 4c4762a1bSJed Brown Contributed by: Eric Chamberland 5c4762a1bSJed Brown */ 6c4762a1bSJed Brown #include <petscmat.h> 7c4762a1bSJed Brown 8c4762a1bSJed Brown 9c4762a1bSJed Brown /* DEFINE this to turn on/off the bug: */ 10c4762a1bSJed Brown #define SET_2nd_PROC_TO_HAVE_NO_LOCAL_LINES 11c4762a1bSJed Brown 12c4762a1bSJed Brown int main(int argc,char **args) 13c4762a1bSJed Brown { 14c4762a1bSJed Brown Mat C; 15c4762a1bSJed Brown PetscInt i,m = 3; 16c4762a1bSJed Brown PetscMPIInt rank,size; 17c4762a1bSJed Brown PetscErrorCode ierr; 18c4762a1bSJed Brown PetscScalar v; 19c4762a1bSJed Brown Mat lMatA; 20c4762a1bSJed Brown PetscInt locallines; 21c4762a1bSJed Brown PetscInt d_nnz[3] = {0,0,0}; 22c4762a1bSJed Brown PetscInt o_nnz[3] = {0,0,0}; 23c4762a1bSJed Brown 24c4762a1bSJed Brown ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 25*ffc4695bSBarry Smith ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRMPI(ierr); 26*ffc4695bSBarry Smith ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRMPI(ierr); 27c4762a1bSJed Brown 28c4762a1bSJed Brown if (2 != size) SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_ARG_INCOMP,"Relevant with 2 processes only"); 29c4762a1bSJed Brown ierr = MatCreate(PETSC_COMM_WORLD,&C);CHKERRQ(ierr); 30c4762a1bSJed Brown 31c4762a1bSJed Brown #ifdef SET_2nd_PROC_TO_HAVE_NO_LOCAL_LINES 32c4762a1bSJed Brown if (0 == rank) { 33c4762a1bSJed Brown locallines = m; 34c4762a1bSJed Brown d_nnz[0] = 1; 35c4762a1bSJed Brown d_nnz[1] = 1; 36c4762a1bSJed Brown d_nnz[2] = 1; 37c4762a1bSJed Brown } else { 38c4762a1bSJed Brown locallines = 0; 39c4762a1bSJed Brown } 40c4762a1bSJed Brown #else 41c4762a1bSJed Brown if (0 == rank) { 42c4762a1bSJed Brown locallines = m-1; 43c4762a1bSJed Brown d_nnz[0] = 1; 44c4762a1bSJed Brown d_nnz[1] = 1; 45c4762a1bSJed Brown } else { 46c4762a1bSJed Brown locallines = 1; 47c4762a1bSJed Brown d_nnz[0] = 1; 48c4762a1bSJed Brown } 49c4762a1bSJed Brown #endif 50c4762a1bSJed Brown 51c4762a1bSJed Brown ierr = MatSetSizes(C,locallines,locallines,m,m);CHKERRQ(ierr); 52c4762a1bSJed Brown ierr = MatSetFromOptions(C);CHKERRQ(ierr); 53c4762a1bSJed Brown ierr = MatXAIJSetPreallocation(C,1,d_nnz,o_nnz,NULL,NULL);CHKERRQ(ierr); 54c4762a1bSJed Brown 55c4762a1bSJed Brown v = 2; 56c4762a1bSJed Brown /* Assembly on the diagonal: */ 57c4762a1bSJed Brown for (i=0; i<m; i++) { 58c4762a1bSJed Brown ierr = MatSetValues(C,1,&i,1,&i,&v,ADD_VALUES);CHKERRQ(ierr); 59c4762a1bSJed Brown } 60c4762a1bSJed Brown ierr = MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 61c4762a1bSJed Brown ierr = MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 62c4762a1bSJed Brown ierr = MatSetOption(C,MAT_NEW_NONZERO_LOCATION_ERR,PETSC_TRUE);CHKERRQ(ierr); 63c4762a1bSJed Brown ierr = MatSetOption(C, MAT_KEEP_NONZERO_PATTERN, PETSC_TRUE);CHKERRQ(ierr); 64c4762a1bSJed Brown ierr = MatView(C,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 65c4762a1bSJed Brown ierr = MatConvert(C,MATSAME, MAT_INITIAL_MATRIX, &lMatA);CHKERRQ(ierr); 66c4762a1bSJed Brown ierr = MatView(lMatA,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 67c4762a1bSJed Brown 68c4762a1bSJed Brown ierr = MatShift(lMatA,-1.0);CHKERRQ(ierr); 69c4762a1bSJed Brown 70c4762a1bSJed Brown ierr = MatDestroy(&lMatA);CHKERRQ(ierr); 71c4762a1bSJed Brown ierr = MatDestroy(&C);CHKERRQ(ierr); 72c4762a1bSJed Brown ierr = PetscFinalize(); 73c4762a1bSJed Brown return ierr; 74c4762a1bSJed Brown } 75c4762a1bSJed Brown 76c4762a1bSJed Brown 77c4762a1bSJed Brown /*TEST 78c4762a1bSJed Brown 79c4762a1bSJed Brown test: 80c4762a1bSJed Brown nsize: 2 81c4762a1bSJed Brown 82c4762a1bSJed Brown TEST*/ 83