1 static char help[] = "Compare parallel partitioning strategies using matrix graphs\n\n"; 2 3 #include <petscmat.h> 4 5 int main(int argc, char **args) 6 { 7 MatPartitioning part; 8 IS partis; 9 Mat A = NULL; 10 PetscInt max = -1; 11 PetscInt min = -1; 12 PetscReal balance = 0.0; 13 const PetscInt *ranges = NULL; 14 char filein[PETSC_MAX_PATH_LEN]; 15 MPI_Comm comm; 16 PetscMPIInt size; 17 PetscInt p; 18 PetscBool flg; 19 PetscErrorCode ierr; 20 21 /*load matrix*/ 22 ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 23 comm = PETSC_COMM_WORLD; 24 ierr = MPI_Comm_size(comm, &size);CHKERRMPI(ierr); 25 ierr = PetscOptionsGetString(NULL,NULL,"-fin",filein,sizeof(filein),&flg);CHKERRQ(ierr); 26 if (flg) { 27 PetscViewer view; 28 ierr = PetscViewerBinaryOpen(comm,filein,FILE_MODE_READ,&view);CHKERRQ(ierr); 29 ierr = MatCreate(comm,&A);CHKERRQ(ierr); 30 ierr = MatLoad(A,view);CHKERRQ(ierr); 31 ierr = PetscViewerDestroy(&view);CHKERRQ(ierr); 32 } 33 34 /*partition matrix*/ 35 ierr = MatPartitioningCreate(comm,&part);CHKERRQ(ierr); 36 ierr = MatPartitioningSetAdjacency(part, A);CHKERRQ(ierr); 37 ierr = MatPartitioningSetFromOptions(part);CHKERRQ(ierr); 38 ierr = MatPartitioningApply(part, &partis);CHKERRQ(ierr); 39 ierr = MatGetOwnershipRanges(A, &ranges);CHKERRQ(ierr); 40 ierr = MatGetSize(A, &min, NULL);CHKERRQ(ierr); 41 for (p = 0; p < size; ++p) { 42 const PetscInt partsize = ranges[p+1]-ranges[p]; 43 44 max = PetscMax(max, partsize); 45 min = PetscMin(min, partsize); 46 } 47 balance = ((PetscReal) max)/min; 48 ierr = PetscPrintf(comm, "ranges: ");CHKERRQ(ierr); 49 for (p = 0; p <= size; ++p) { 50 if (p > 0) {ierr = PetscPrintf(comm, ", ");CHKERRQ(ierr);} 51 ierr = PetscPrintf(comm, "%D", ranges[p]);CHKERRQ(ierr); 52 } 53 ierr = PetscPrintf(comm, "\n");CHKERRQ(ierr); 54 ierr = PetscPrintf(comm, "max:%.0lf min:%.0lf balance:%.11lf\n", (double) max,(double) min,(double) balance);CHKERRQ(ierr); 55 ierr = PetscObjectViewFromOptions((PetscObject)partis,NULL,"-partition_view");CHKERRQ(ierr); 56 ierr = MatPartitioningDestroy(&part);CHKERRQ(ierr); 57 ierr = ISDestroy(&partis);CHKERRQ(ierr); 58 ierr = MatDestroy(&A);CHKERRQ(ierr); 59 ierr = PetscFinalize(); 60 return ierr; 61 62 } 63