Actual source code: ex15f.F90
petsc-3.12.4 2020-02-04
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      1: program main

      3:  #include <petsc/finclude/petscvec.h>
      4:  #include <petsc/finclude/petscmat.h>

      6:   use petscvec
      7:   use petscmat

      9:   implicit none

     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

     22:   call PetscInitialize(PETSC_NULL_CHARACTER,ierr)
     23:   if (ierr /= 0) then
     24:    print*,'PetscInitialize failed'
     25:    stop
     26:   endif

     28:   call PetscOptionsGetInt(PETSC_NULL_OPTIONS,PETSC_NULL_CHARACTER,"-N",N,flg,ierr);CHKERRA(ierr)
     29:   call MatCreate(PETSC_COMM_WORLD, A,ierr);CHKERRA(ierr)
     30:   call MatSetSizes(A, PETSC_DECIDE, PETSC_DECIDE, N, N,ierr);CHKERRA(ierr)
     31:   call MatSetFromOptions(A,ierr);CHKERRA(ierr)
     32:   call MatSeqAIJSetPreallocation(A, three, PETSC_NULL_INTEGER,ierr);CHKERRA(ierr)
     33:   call MatMPIAIJSetPreallocation(A, three, PETSC_NULL_INTEGER, two, PETSC_NULL_INTEGER,ierr);CHKERRA(ierr)

     35:   !/* Create a linear mesh */
     36:   call MatGetOwnershipRange(A, myStart, myEnd,ierr);CHKERRA(ierr)
     37:
     38:   do r=myStart,myEnd-1
     39:     if (r == 0) then
     40:      allocate(vals(2))
     41:      vals = 1.0
     42:      allocate(cols(2),source=[r,r+1])
     43:      call MatSetValues(A, one, r, two, cols, vals, INSERT_VALUES,ierr);CHKERRA(ierr)
     44:      deallocate(cols)
     45:      deallocate(vals)
     46:     else if (r == N-1) then
     47:      allocate(vals(2))
     48:      vals = 1.0
     49:      allocate(cols(2),source=[r-1,r])
     50:      call MatSetValues(A, one, r, two, cols, vals, INSERT_VALUES,ierr);CHKERRA(ierr)
     51:      deallocate(cols)
     52:      deallocate(vals)
     53:     else
     54:      allocate(vals(3))
     55:      vals = 1.0
     56:      allocate(cols(3),source=[r-1,r,r+1])
     57:      call MatSetValues(A, one, r, three, cols, vals, INSERT_VALUES,ierr);CHKERRA(ierr)
     58:      deallocate(cols)
     59:      deallocate(vals)
     60:     end if
     61:   end do
     62:   call MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY,ierr);CHKERRA(ierr)
     63:   call MatAssemblyend(A, MAT_FINAL_ASSEMBLY,ierr);CHKERRA(ierr)
     64:   call MatPartitioningCreate(PETSC_COMM_WORLD, part,ierr);CHKERRA(ierr)
     65:   call MatPartitioningSetAdjacency(part, A,ierr);CHKERRA(ierr)
     66:   call MatPartitioningSetFromOptions(part,ierr);CHKERRA(ierr)
     67:   call MatPartitioningApply(part, is,ierr);CHKERRA(ierr)
     68:   call ISView(is, PETSC_VIEWER_STDOUT_WORLD,ierr);CHKERRA(ierr)
     69:   call ISDestroy(is,ierr);CHKERRA(ierr)
     70:   call MatPartitioningDestroy(part,ierr);CHKERRA(ierr)
     71:   call MatDestroy(A,ierr);CHKERRA(ierr)
     72:   call PetscFinalize(ierr);CHKERRA(ierr)
     73:
     74: end program

     76: !/*TEST
     77: !
     78: !   test:
     79: !      nsize: 3
     80: !      requires: parmetis
     81: !      args: -mat_partitioning_type parmetis
     82: !      output_file: output/ex15_1.out
     83: !
     84: !   test:
     85: !      suffix: 2
     86: !      nsize: 3
     87: !      requires: ptscotch
     88: !      args: -mat_partitioning_type ptscotch
     89: !      output_file: output/ex15_2.out
     90: !
     91: !   test:
     92: !      suffix: 3
     93: !      nsize: 4
     94: !      requires: party
     95: !      args: -mat_partitioning_type party
     96: !      output_file: output/ex15_3.out
     97: !
     98: !   test:
     99: !      suffix: 4
    100: !      nsize: 3
    101: !      requires: chaco
    102: !      args: -mat_partitioning_type chaco
    103: !      output_file: output/ex15_4.out
    104: !
    105: !   test:
    106: !      suffix: 5
    107: !      nsize: 3
    108: !      requires: parmetis
    109: !      args: -mat_partitioning_type hierarch -mat_partitioning_hierarchical_nfineparts 3 -mat_partitioning_nparts 10 -N 100
    110: !      output_file: output/ex15_5.out
    111: !
    112: !TEST*/