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main.f90
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main.f90
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!
! Copyright (C) 2013, Northwestern University
! See COPYRIGHT notice in top-level directory.
!
!----< main >-----------------------------------------------------
program main
use mpi
use param_m, only: npx, npy, npz
use param_m, only: initialize_param
use topology_m, only: gcomm, npes, myid, initialize_topology
implicit none
integer err
logical isArgvRight
call MPI_Init(err)
call MPI_Comm_rank(MPI_COMM_WORLD, myid, err)
call MPI_Comm_size(MPI_COMM_WORLD, npes, err)
call MPI_Comm_dup(MPI_COMM_WORLD, gcomm,err)
call read_command_line_arg(isArgvRight)
if (.NOT. isArgvRight) goto 999
! initialize parameters: nx, ny, nz, nsc, n_spec
call initialize_param(myid, gcomm)
! initialize MPI process topology
call initialize_topology(npx,npy,npz)
! main computation task is here
call MPI_Barrier(gcomm,err)
call solve_driver
999 call MPI_Comm_free(gcomm,err)
call MPI_Finalize(err)
end program main
!----< read_command_line_arg >------------------------------------
subroutine read_command_line_arg(isArgvRight)
use mpi
use param_m, only: nx_g, ny_g, nz_g, npx, npy, npz, nsc
use param_m, only: initialize_param
use runtime_m, only: method, restart, io_one_species_at_a_time
use topology_m, only: gcomm, npes, myid, initialize_topology
use io_profiling_m, only: dir_path
implicit none
character(len=128) executable
logical isArgvRight
! declare external functions
integer IARGC
! local variables for reading command-line arguments
character(len = 256) :: argv(9)
integer i, argc, int_argv(7), err
integer(MPI_OFFSET_KIND) io_size
! Only root process reads command-line arguments
if (myid .EQ. 0) then
isArgvRight = .TRUE.
call getarg(0, executable)
argc = IARGC()
if (argc .NE. 9) then
print *, 'Usage: ',trim(executable), &
' nx_g ny_g nz_g npx npy npz method restart dir_path'
isArgvRight = .FALSE.
else
do i=1, argc-2
call getarg(i, argv(i))
read(argv(i), FMT='(I16)') int_argv(i)
enddo
call getarg(argc-1, argv(argc-1))
read(argv(argc-1), FMT='(L)') restart
call getarg(argc, argv(argc))
dir_path = argv(argc)
nx_g = int_argv(1)
ny_g = int_argv(2)
nz_g = int_argv(3)
npx = int_argv(4)
npy = int_argv(5)
npz = int_argv(6)
method = int_argv(7)
endif
endif
! broadcast if arguments are valid
call MPI_Bcast(isArgvRight, 1, MPI_LOGICAL, 0, gcomm, err)
if (.NOT. isArgvRight) return
call MPI_Bcast(nx_g, 1, MPI_INTEGER, 0, gcomm, err)
call MPI_Bcast(ny_g, 1, MPI_INTEGER, 0, gcomm, err)
call MPI_Bcast(nz_g, 1, MPI_INTEGER, 0, gcomm, err)
call MPI_Bcast(npx, 1, MPI_INTEGER, 0, gcomm, err)
call MPI_Bcast(npy, 1, MPI_INTEGER, 0, gcomm, err)
call MPI_Bcast(npz, 1, MPI_INTEGER, 0, gcomm, err)
call MPI_Bcast(method, 1, MPI_INTEGER, 0, gcomm, err)
call MPI_Bcast(restart, 1, MPI_LOGICAL, 0, gcomm, err)
call MPI_Bcast(dir_path, 256, MPI_CHARACTER, 0, gcomm, err)
io_size = 8
io_size = io_size * nx_g
io_size = io_size * ny_g
io_size = io_size * ny_g
io_size = io_size / npes
if (io_size .GT. 2147483647) then
if (myid .EQ. 0) then
print*, '******** Error ********'
print*, ' Array size per process is too large for 4-byte integers'
print*, ' Please use a smaller array size. Exit...'
print*, '******** Error ********'
endif
call MPI_Finalize(err)
STOP
endif
io_one_species_at_a_time = .FALSE.
io_size = io_size * (11 + 3 + 2)
if (io_size .GT. 2147483647) then
if (myid .EQ. 0) then
print*, '******** Warning ********'
print*, 'Warning: Array size is too large for 4-byte integers'
print*, 'Warning: I/O is now performed one species at a time'
if (method .EQ. 1) &
print*, 'Warning: Switch to blocking I/O method'
print*, '******** Warning ********'
endif
method = 0
io_one_species_at_a_time = .TRUE.
endif
end subroutine read_command_line_arg