part_random_procedures.f90 Source File

!
!     (c) 2019 Guide Star Engineering, LLC
!     This Software was developed for the US Nuclear Regulatory Commission (US NRC)
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!     Steady-state and Transients (FAST)", contract # NRC-HQ-60-17-C-0007
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!
!    NEMO - Numerical Engine (for) Multiphysics Operators
! Copyright (c) 2007, Stefano Toninel
!                     Gian Marco Bianchi  University of Bologna
!              David P. Schmidt    University of Massachusetts - Amherst
!              Salvatore Filippone University of Rome Tor Vergata
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!---------------------------------------------------------------------------------
!
! $Id: part_random.f90 8157 2014-10-09 13:02:44Z sfilippo $
!
! Description:
!    Random partitioning
!
SUBMODULE(part_random) part_random_procedures

    USE class_psblas

    IMPLICIT NONE

CONTAINS

    MODULE PROCEDURE bld_part_random
        !
        INTEGER :: ic, icontxt, info, mypnum, n
        REAL(psb_dpk_) :: alpha
        REAL(psb_dpk_) :: load(0:(nprocs-1))

        icontxt = icontxt_()
        mypnum  = mypnum_()
!!$
!!$    if(associated(part) .and. size(part) /= ncells) then
!!$       deallocate(part)
!!$       part => null()
!!$    end if
!!$
!!$    if(.not.associated(part)) then

        ALLOCATE(part(ncells),stat=info)
        IF(info /= 0) THEN
            WRITE(*,100)
            CALL abort_psblas
        END IF
!!$    end if

        IF(mypnum == 0) THEN
            WRITE(*,200)
            WRITE(*,300,advance='no') 'RANDOM'
        END IF

        ! RANDOM partitioning
        n = nprocs - 1
        DO ic = 1, ncells
            CALL random_NUMBER(alpha)
            part(ic) = NINT(alpha * n)
        END DO

        ! Computes load of single processes
        load = 0.d0
        DO ic=0,n
            load(ic) = COUNT(part==ic)
            load(ic) = REAL(load(ic)) / REAL(ncells) * 100
        ENDDO
        WRITE(*,400) load

100     FORMAT(' ERROR! Memory allocation failure in BLD_PART_RANDOM')
200     FORMAT(' Domain Partitioning',5x,'Load')
300     FORMAT(1x,a)
400     FORMAT(15x,16(3x,f5.1,'%'))

    END PROCEDURE bld_part_random

END SUBMODULE part_random_procedures