1c4762a1bSJed Brown static char help[] = "Compare parallel partitioning strategies using matrix graphs\n\n"; 2c4762a1bSJed Brown 3c4762a1bSJed Brown #include <petscmat.h> 4c4762a1bSJed Brown 5c4762a1bSJed Brown int main(int argc, char **args) 6c4762a1bSJed Brown { 7c4762a1bSJed Brown MatPartitioning part; 8c4762a1bSJed Brown IS partis; 9c4762a1bSJed Brown Mat A = NULL; 10c4762a1bSJed Brown PetscInt max = -1; 11c4762a1bSJed Brown PetscInt min = -1; 12c4762a1bSJed Brown PetscReal balance = 0.0; 13c4762a1bSJed Brown const PetscInt *ranges = NULL; 14c4762a1bSJed Brown char filein[PETSC_MAX_PATH_LEN]; 15c4762a1bSJed Brown MPI_Comm comm; 16c4762a1bSJed Brown PetscMPIInt size; 17c4762a1bSJed Brown PetscInt p; 18c4762a1bSJed Brown PetscBool flg; 19c4762a1bSJed Brown 20c4762a1bSJed Brown /*load matrix*/ 219566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc,&args,(char*)0,help)); 22c4762a1bSJed Brown comm = PETSC_COMM_WORLD; 239566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_size(comm, &size)); 249566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetString(NULL,NULL,"-fin",filein,sizeof(filein),&flg)); 25c4762a1bSJed Brown if (flg) { 26c4762a1bSJed Brown PetscViewer view; 279566063dSJacob Faibussowitsch PetscCall(PetscViewerBinaryOpen(comm,filein,FILE_MODE_READ,&view)); 289566063dSJacob Faibussowitsch PetscCall(MatCreate(comm,&A)); 299566063dSJacob Faibussowitsch PetscCall(MatLoad(A,view)); 309566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&view)); 31c4762a1bSJed Brown } 32c4762a1bSJed Brown 33c4762a1bSJed Brown /*partition matrix*/ 349566063dSJacob Faibussowitsch PetscCall(MatPartitioningCreate(comm,&part)); 359566063dSJacob Faibussowitsch PetscCall(MatPartitioningSetAdjacency(part, A)); 369566063dSJacob Faibussowitsch PetscCall(MatPartitioningSetFromOptions(part)); 379566063dSJacob Faibussowitsch PetscCall(MatPartitioningApply(part, &partis)); 389566063dSJacob Faibussowitsch PetscCall(MatGetOwnershipRanges(A, &ranges)); 399566063dSJacob Faibussowitsch PetscCall(MatGetSize(A, &min, NULL)); 40c4762a1bSJed Brown for (p = 0; p < size; ++p) { 41c4762a1bSJed Brown const PetscInt partsize = ranges[p+1]-ranges[p]; 42c4762a1bSJed Brown 43c4762a1bSJed Brown max = PetscMax(max, partsize); 44c4762a1bSJed Brown min = PetscMin(min, partsize); 45c4762a1bSJed Brown } 46c4762a1bSJed Brown balance = ((PetscReal) max)/min; 479566063dSJacob Faibussowitsch PetscCall(PetscPrintf(comm, "ranges: ")); 48c4762a1bSJed Brown for (p = 0; p <= size; ++p) { 499566063dSJacob Faibussowitsch if (p > 0) PetscCall(PetscPrintf(comm, ", ")); 50*63a3b9bcSJacob Faibussowitsch PetscCall(PetscPrintf(comm, "%" PetscInt_FMT, ranges[p])); 51c4762a1bSJed Brown } 529566063dSJacob Faibussowitsch PetscCall(PetscPrintf(comm, "\n")); 539566063dSJacob Faibussowitsch PetscCall(PetscPrintf(comm, "max:%.0lf min:%.0lf balance:%.11lf\n", (double) max,(double) min,(double) balance)); 549566063dSJacob Faibussowitsch PetscCall(PetscObjectViewFromOptions((PetscObject)partis,NULL,"-partition_view")); 559566063dSJacob Faibussowitsch PetscCall(MatPartitioningDestroy(&part)); 569566063dSJacob Faibussowitsch PetscCall(ISDestroy(&partis)); 579566063dSJacob Faibussowitsch PetscCall(MatDestroy(&A)); 589566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 59b122ec5aSJacob Faibussowitsch return 0; 60c4762a1bSJed Brown 61c4762a1bSJed Brown } 62