1program main 2 3#include <petsc/finclude/petscvec.h> 4#include <petsc/finclude/petscmat.h> 5 6 use petscvec 7 use petscmat 8 9 implicit none 10 11 Mat :: A 12 MatPartitioning :: part 13 IS :: is 14 PetscInt :: r,myStart,myEnd 15 PetscInt :: N = 10 16 PetscErrorCode :: ierr 17 PetscScalar,pointer,dimension(:) :: vals 18 PetscInt,pointer,dimension(:) :: cols 19 PetscBool :: flg 20 PetscInt,parameter :: one = 1, two = 2, three = 3 21 22 PetscCallA(PetscInitialize(ierr)) 23 24 PetscCallA(PetscOptionsGetInt(PETSC_NULL_OPTIONS,PETSC_NULL_CHARACTER,'-N',N,flg,ierr)) 25 PetscCallA(MatCreate(PETSC_COMM_WORLD, A,ierr)) 26 PetscCallA(MatSetSizes(A, PETSC_DECIDE, PETSC_DECIDE, N, N,ierr)) 27 PetscCallA(MatSetFromOptions(A,ierr)) 28 PetscCallA(MatSeqAIJSetPreallocation(A, three, PETSC_NULL_INTEGER,ierr)) 29 PetscCallA(MatMPIAIJSetPreallocation(A, three, PETSC_NULL_INTEGER, two, PETSC_NULL_INTEGER,ierr)) 30 31 !/* Create a linear mesh */ 32 PetscCallA(MatGetOwnershipRange(A, myStart, myEnd,ierr)) 33 34 do r=myStart,myEnd-1 35 if (r == 0) then 36 allocate(vals(2)) 37 vals = 1.0 38 allocate(cols(2),source=[r,r+1]) 39 PetscCallA(MatSetValues(A, one, r, two, cols, vals, INSERT_VALUES,ierr)) 40 deallocate(cols) 41 deallocate(vals) 42 else if (r == N-1) then 43 allocate(vals(2)) 44 vals = 1.0 45 allocate(cols(2),source=[r-1,r]) 46 PetscCallA(MatSetValues(A, one, r, two, cols, vals, INSERT_VALUES,ierr)) 47 deallocate(cols) 48 deallocate(vals) 49 else 50 allocate(vals(3)) 51 vals = 1.0 52 allocate(cols(3),source=[r-1,r,r+1]) 53 PetscCallA(MatSetValues(A, one, r, three, cols, vals, INSERT_VALUES,ierr)) 54 deallocate(cols) 55 deallocate(vals) 56 end if 57 end do 58 PetscCallA(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY,ierr)) 59 PetscCallA(MatAssemblyend(A, MAT_FINAL_ASSEMBLY,ierr)) 60 PetscCallA(MatPartitioningCreate(PETSC_COMM_WORLD, part,ierr)) 61 PetscCallA(MatPartitioningSetAdjacency(part, A,ierr)) 62 PetscCallA(MatPartitioningSetFromOptions(part,ierr)) 63 PetscCallA(MatPartitioningApply(part, is,ierr)) 64 PetscCallA(ISView(is, PETSC_VIEWER_STDOUT_WORLD,ierr)) 65 PetscCallA(ISDestroy(is,ierr)) 66 PetscCallA(MatPartitioningDestroy(part,ierr)) 67 PetscCallA(MatDestroy(A,ierr)) 68 PetscCallA(PetscFinalize(ierr)) 69 70end program 71 72!/*TEST 73! 74! test: 75! nsize: 3 76! requires: parmetis 77! args: -mat_partitioning_type parmetis 78! output_file: output/ex15_1.out 79! 80! test: 81! suffix: 2 82! nsize: 3 83! requires: ptscotch 84! args: -mat_partitioning_type ptscotch 85! output_file: output/ex15_2.out 86! 87! test: 88! suffix: 3 89! nsize: 4 90! requires: party 91! args: -mat_partitioning_type party 92! output_file: output/ex15_3.out 93! 94! test: 95! suffix: 4 96! nsize: 3 97! requires: chaco 98! args: -mat_partitioning_type chaco 99! output_file: output/ex15_4.out 100! 101! test: 102! suffix: 5 103! nsize: 3 104! requires: parmetis 105! args: -mat_partitioning_type hierarch -mat_partitioning_hierarchical_nfineparts 3 -mat_partitioning_nparts 10 -N 100 106! output_file: output/ex15_5.out 107! 108!TEST*/ 109