1 2 static char help[] = "Demonstrates constructing an application ordering.\n\n"; 3 4 #include <petscao.h> 5 #include <petscviewer.h> 6 7 int main(int argc,char **argv) 8 { 9 PetscInt n = 5; 10 PetscErrorCode ierr; 11 PetscMPIInt rank,size; 12 IS ispetsc,isapp; 13 AO ao; 14 15 ierr = PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr; 16 ierr = PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);CHKERRQ(ierr); 17 ierr = MPI_Comm_rank(PETSC_COMM_WORLD,&rank);CHKERRQ(ierr); 18 ierr = MPI_Comm_size(PETSC_COMM_WORLD,&size);CHKERRQ(ierr); 19 20 /* create the index sets */ 21 ierr = ISCreateStride(PETSC_COMM_WORLD,n,rank,size,&ispetsc);CHKERRQ(ierr); 22 ierr = ISCreateStride(PETSC_COMM_WORLD,n,n*rank,1,&isapp);CHKERRQ(ierr); 23 24 /* create the application ordering */ 25 ierr = AOCreateBasicIS(isapp,ispetsc,&ao);CHKERRQ(ierr); 26 27 28 ierr = AOView(ao,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 29 30 ierr = ISView(ispetsc,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 31 ierr = ISView(isapp,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 32 ierr = AOPetscToApplicationIS(ao,ispetsc);CHKERRQ(ierr); 33 ierr = ISView(isapp,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 34 ierr = ISView(ispetsc,PETSC_VIEWER_STDOUT_WORLD);CHKERRQ(ierr); 35 36 37 ierr = ISDestroy(&ispetsc);CHKERRQ(ierr); 38 ierr = ISDestroy(&isapp);CHKERRQ(ierr); 39 40 ierr = AODestroy(&ao);CHKERRQ(ierr); 41 ierr = PetscFinalize(); 42 return ierr; 43 } 44 45 /*TEST 46 47 test: 48 nsize: 2 49 50 TEST*/ 51