Actual source code: ex17f.F90
petsc-3.13.6 2020-09-29
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      2: 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   ::     i,m,N
     15:   PetscInt   ::     rstart,rend
     16:   PetscInt,pointer,dimension(:) ::   emptyranks,bigranks,cols
     17:   PetscScalar,pointer,dimension(:) :: vals
     18:   PetscInt :: &
     19:     nbigranks   = 10, &
     20:     nemptyranks = 10
     21:   PetscMPIInt   ::  rank,sizef
     22:   PetscErrorCode  ierr
     23:   PetscBool  set
     24:   PetscInt,parameter :: zero = 0, one = 1, two = 2, three = 3

     26:   call PetscInitialize(PETSC_NULL_CHARACTER,ierr)
     27:   if (ierr /= 0) then
     28:     print*,'PetscInitialize failed'
     29:     stop
     30:   endif
     31:
     32:   call MPI_Comm_rank(PETSC_COMM_WORLD,rank,ierr);CHKERRA(ierr)
     33:   call MPI_Comm_size(PETSC_COMM_WORLD,sizef,ierr);CHKERRA(ierr)

     35:   allocate(emptyranks(nemptyranks))
     36:   allocate(bigranks(nbigranks))

     38:   call PetscOptionsGetIntArray(PETSC_NULL_OPTIONS,PETSC_NULL_CHARACTER,"-emptyranks",emptyranks,nemptyranks,set,ierr);CHKERRA(ierr)
     39:   call PetscOptionsGetIntArray(PETSC_NULL_OPTIONS,PETSC_NULL_CHARACTER,"-bigranks",bigranks,nbigranks,set,ierr);CHKERRA(ierr)
     40:
     41:   m = 1
     42:   do i=1,nemptyranks
     43:     if (rank == emptyranks(i)) m = 0
     44:   end do
     45:   do i=1,nbigranks
     46:     if (rank == bigranks(i)) m = 5
     47:   end do

     49:   deallocate(emptyranks)
     50:   deallocate(bigranks)

     52:   call MatCreate(PETSC_COMM_WORLD,A,ierr);CHKERRA(ierr)
     53:   call MatSetsizes(A,m,m,PETSC_DECIDE,PETSC_DECIDE,ierr);CHKERRA(ierr)
     54:   call MatSetFromOptions(A,ierr);CHKERRA(ierr)
     55:   call MatSeqAIJSetPreallocation(A,three,PETSC_NULL_INTEGER,ierr);CHKERRA(ierr)
     56:   call MatMPIAIJSetPreallocation(A,three,PETSC_NULL_INTEGER,two,PETSC_NULL_INTEGER,ierr);CHKERRA(ierr)
     57:   call MatSeqBAIJSetPreallocation(A,one,three,PETSC_NULL_INTEGER,ierr);CHKERRA(ierr)
     58:   call MatMPIBAIJSetPreallocation(A,one,three,PETSC_NULL_INTEGER,2,PETSC_NULL_INTEGER,ierr);CHKERRA(ierr)
     59:   call MatSeqSBAIJSetPreallocation(A,one,two,PETSC_NULL_INTEGER,ierr);CHKERRA(ierr)
     60:   call MatMPISBAIJSetPreallocation(A,one,two,PETSC_NULL_INTEGER,1,PETSC_NULL_INTEGER,ierr);CHKERRA(ierr)

     62:   call MatGetSize(A,PETSC_NULL_INTEGER,N,ierr);CHKERRA(ierr)
     63:   call MatGetOwnershipRange(A,rstart,rend,ierr);CHKERRA(ierr)
     64:
     65:   allocate(cols(0:3))
     66:   allocate(vals(0:3))
     67:   do i=rstart,rend-1
     68:
     69:     cols = (/mod((i+N-1),N),i,mod((i+1),N)/)
     70:     vals = [1.0,1.0,1.0]
     71:     call MatSetValues(A,one,i,three,cols,vals,INSERT_VALUES,ierr);CHKERRA(ierr)
     72:   end do
     73:   deallocate(cols)
     74:   deallocate(vals)
     75:   call MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY,ierr);CHKERRA(ierr)
     76:   call MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY,ierr);CHKERRA(ierr)
     77:   call MatView(A,PETSC_VIEWER_STDOUT_WORLD,ierr);CHKERRA(ierr)

     79:   call MatPartitioningCreate(PETSC_COMM_WORLD,part,ierr);CHKERRA(ierr)
     80:   call MatPartitioningSetAdjacency(part,A,ierr);CHKERRA(ierr)
     81:   call MatPartitioningSetFromOptions(part,ierr);CHKERRA(ierr)
     82:   call MatPartitioningApply(part,is,ierr);CHKERRA(ierr)
     83:   call ISView(is,PETSC_VIEWER_STDOUT_WORLD,ierr);CHKERRA(ierr)
     84:   call ISDestroy(is,ierr);CHKERRA(ierr)
     85:   call MatPartitioningDestroy(part,ierr);CHKERRA(ierr)
     86:   call MatDestroy(A,ierr);CHKERRA(ierr)
     87:   call PetscFinalize(ierr);CHKERRA(ierr)
     88:
     89: end program

     92: !/*TEST
     93: !
     94: !   test:
     95: !      nsize: 8
     96: !      args: -emptyranks 0,2,4 -bigranks 1,3,7 -mat_partitioning_type average
     97: !      output_file: output/ex17_1.out
     98: !      # cannot test with external package partitioners since they produce different results on different systems
     99: !
    100: !TEST*/