1c4762a1bSJed Brown static const char help[] = "Test parallel assembly of SBAIJ matrices\n\n";
2c4762a1bSJed Brown
3c4762a1bSJed Brown #include <petscmat.h>
4c4762a1bSJed Brown
Assemble(MPI_Comm comm,PetscInt n,MatType mtype)5d71ae5a4SJacob Faibussowitsch PetscErrorCode Assemble(MPI_Comm comm, PetscInt n, MatType mtype)
6d71ae5a4SJacob Faibussowitsch {
7c4762a1bSJed Brown Mat A;
8c4762a1bSJed Brown PetscInt first, last, i;
9c4762a1bSJed Brown PetscMPIInt rank, size;
10c4762a1bSJed Brown
11c4762a1bSJed Brown PetscFunctionBegin;
129566063dSJacob Faibussowitsch PetscCall(MatCreate(PETSC_COMM_WORLD, &A));
139566063dSJacob Faibussowitsch PetscCall(MatSetSizes(A, PETSC_DECIDE, PETSC_DECIDE, n, n));
149566063dSJacob Faibussowitsch PetscCall(MatSetType(A, MATMPISBAIJ));
159566063dSJacob Faibussowitsch PetscCall(MatSetFromOptions(A));
169566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_size(comm, &size));
179566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_rank(comm, &rank));
18c4762a1bSJed Brown if (rank < size - 1) {
199566063dSJacob Faibussowitsch PetscCall(MatMPISBAIJSetPreallocation(A, 1, 1, NULL, 1, NULL));
20c4762a1bSJed Brown } else {
219566063dSJacob Faibussowitsch PetscCall(MatMPISBAIJSetPreallocation(A, 1, 2, NULL, 0, NULL));
22c4762a1bSJed Brown }
239566063dSJacob Faibussowitsch PetscCall(MatGetOwnershipRange(A, &first, &last));
249566063dSJacob Faibussowitsch PetscCall(MatSetOption(A, MAT_NEW_NONZERO_ALLOCATION_ERR, PETSC_TRUE));
25c4762a1bSJed Brown last--;
26c4762a1bSJed Brown for (i = first; i <= last; i++) {
279566063dSJacob Faibussowitsch PetscCall(MatSetValue(A, i, i, 2., INSERT_VALUES));
289566063dSJacob Faibussowitsch if (i != n - 1) PetscCall(MatSetValue(A, i, n - 1, -1., INSERT_VALUES));
29c4762a1bSJed Brown }
309566063dSJacob Faibussowitsch PetscCall(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY));
319566063dSJacob Faibussowitsch PetscCall(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY));
329566063dSJacob Faibussowitsch PetscCall(MatDestroy(&A));
33*3ba16761SJacob Faibussowitsch PetscFunctionReturn(PETSC_SUCCESS);
34c4762a1bSJed Brown }
35c4762a1bSJed Brown
main(int argc,char * argv[])36d71ae5a4SJacob Faibussowitsch int main(int argc, char *argv[])
37d71ae5a4SJacob Faibussowitsch {
38c4762a1bSJed Brown MPI_Comm comm;
39c4762a1bSJed Brown PetscInt n = 6;
40c4762a1bSJed Brown
41327415f7SBarry Smith PetscFunctionBeginUser;
429566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc, &argv, NULL, help));
43c4762a1bSJed Brown comm = PETSC_COMM_WORLD;
449566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-n", &n, NULL));
459566063dSJacob Faibussowitsch PetscCall(Assemble(comm, n, MATMPISBAIJ));
469566063dSJacob Faibussowitsch PetscCall(PetscFinalize());
47b122ec5aSJacob Faibussowitsch return 0;
48c4762a1bSJed Brown }
49c4762a1bSJed Brown
50c4762a1bSJed Brown /*TEST
51c4762a1bSJed Brown
52c4762a1bSJed Brown test:
53c4762a1bSJed Brown nsize: 4
5497929ea7SJunchao Zhang args: -n 1000 -mat_view ascii::ascii_info_detail
55dfd57a17SPierre Jolivet requires: double !complex !defined(PETSC_USE_64BIT_INDICES)
56c4762a1bSJed Brown
57c4762a1bSJed Brown TEST*/
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