1 2 static char help[] = "Tests MatMeshToDual()\n\n"; 3 4 /*T 5 Concepts: Mat^mesh partitioning 6 Processors: n 7 T*/ 8 9 /* 10 Include "petscmat.h" so that we can use matrices. 11 automatically includes: 12 petscsys.h - base PETSc routines petscvec.h - vectors 13 petscmat.h - matrices 14 petscis.h - index sets petscviewer.h - viewers 15 */ 16 #include <petscmat.h> 17 18 int main(int argc,char **args) 19 { 20 Mat mesh,dual; 21 PetscErrorCode ierr; 22 PetscInt Nvertices = 6; /* total number of vertices */ 23 PetscInt ncells = 2; /* number cells on this process */ 24 PetscInt *ii,*jj; 25 PetscMPIInt size,rank; 26 MatPartitioning part; 27 IS is; 28 29 ierr = PetscInitialize(&argc,&args,(char*)0,help);if (ierr) return ierr; 30 ierr = MPI_Comm_size(MPI_COMM_WORLD,&size);CHKERRQ(ierr); 31 if (size != 2) SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_SUP,"This example is for exactly two processes"); 32 ierr = MPI_Comm_rank(MPI_COMM_WORLD,&rank);CHKERRQ(ierr); 33 34 ierr = PetscMalloc1(3,&ii);CHKERRQ(ierr); 35 ierr = PetscMalloc1(6,&jj);CHKERRQ(ierr); 36 ii[0] = 0; ii[1] = 3; ii[2] = 6; 37 if (!rank) { 38 jj[0] = 0; jj[1] = 1; jj[2] = 2; jj[3] = 1; jj[4] = 2; jj[5] = 3; 39 } else { 40 jj[0] = 1; jj[1] = 4; jj[2] = 5; jj[3] = 1; jj[4] = 3; jj[5] = 5; 41 } 42 ierr = MatCreateMPIAdj(MPI_COMM_WORLD,ncells,Nvertices,ii,jj,NULL,&mesh);CHKERRQ(ierr); 43 ierr = MatMeshToCellGraph(mesh,2,&dual);CHKERRQ(ierr); 44 ierr = MatView(dual,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 45 46 ierr = MatPartitioningCreate(MPI_COMM_WORLD,&part);CHKERRQ(ierr); 47 ierr = MatPartitioningSetAdjacency(part,dual);CHKERRQ(ierr); 48 ierr = MatPartitioningSetFromOptions(part);CHKERRQ(ierr); 49 ierr = MatPartitioningApply(part,&is);CHKERRQ(ierr); 50 ierr = ISView(is,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 51 ierr = ISDestroy(&is);CHKERRQ(ierr); 52 ierr = MatPartitioningDestroy(&part);CHKERRQ(ierr); 53 54 ierr = MatDestroy(&mesh);CHKERRQ(ierr); 55 ierr = MatDestroy(&dual);CHKERRQ(ierr); 56 ierr = PetscFinalize(); 57 return ierr; 58 } 59 60 61 62 63 64 /*TEST 65 66 build: 67 requires: parmetis 68 69 test: 70 nsize: 2 71 requires: parmetis 72 73 TEST*/ 74