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