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!
! Copyright (C) 2012, Northwestern University and Argonne National Laboratory
! See COPYRIGHT notice in top-level directory.
!
! $Id$
! This example is the Fortran 77 version of nonblocking_write.c
! It creates a netcdf file in CD-5 format and writes a number of
! 3D integer non-record variables.
! Usage: (for example)
! To compile:
! mpif77 -O2 nonblocking_write.f -o nonblocking_write -lpnetcdf
! To run (for example):
! mpiexec -n 32 ./nonblocking_write /pvfs2/wkliao/testfile.nc 10
! The size of each local array is len x len x len. Each non-record
! variable is of size len*len*len * nprocs * sizeof(int)
! All variables are partitioned among all processes in a 3D
! block-block-block fashion.
!
subroutine check(err, message)
implicit none
include "mpif.h"
include "pnetcdf.inc"
integer err
character message*(*)
! It is a good idea to check returned value for possible error
if (err .NE. NF_NOERR) then
write(6,*) message//' '//nfmpi_strerror(err)
call MPI_Abort(MPI_COMM_WORLD, -1, err)
end if
end
program main
implicit none
include "mpif.h"
include "pnetcdf.inc"
integer NDIMS, NUM_VARS, BUFSIZE
PARAMETER(NDIMS=3, NUM_VARS=10, BUFSIZE=1000)
character*256 filename, cmd, str
integer i, j, cmode, err, ierr, get_args, info
integer rank, nprocs, ncid, len
integer buf(BUFSIZE, NUM_VARS), buf1d(BUFSIZE)
integer psizes(NDIMS), dimids(NDIMS), varids(NUM_VARS)
integer req(NUM_VARS), st(NUM_VARS)
integer*8 gsizes(NDIMS)
integer*8 starts(NDIMS), counts(NDIMS)
integer*8 bbufsize
integer*8 malloc_size, sum_size
logical verbose
call MPI_Init(err)
call MPI_Comm_rank(MPI_COMM_WORLD, rank, err)
call MPI_Comm_size(MPI_COMM_WORLD, nprocs, err)
! take filename from command-line argument if there is any
if (rank .EQ. 0) then
verbose = .TRUE.
filename = "testfile.nc"
len = 10
ierr = get_args(3, cmd, filename, verbose, len)
endif
call MPI_Bcast(ierr, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, err)
if (ierr .EQ. 0) goto 999
call MPI_Bcast(verbose, 1, MPI_LOGICAL, 0, MPI_COMM_WORLD,
+ err)
call MPI_Bcast(filename, 256, MPI_CHARACTER, 0,
+ MPI_COMM_WORLD, err)
call MPI_Bcast(len, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, err)
if (len .GT. BUFSIZE) then
print*,'Maximum len is 10, change it to 10'
len = BUFSIZE
endif
do i=1,NDIMS
psizes(i) = 0
enddo
! create a block-block-block data partitioning
call MPI_Dims_create(nprocs, NDIMS, psizes, err)
starts(1) = mod(rank, psizes(1))
starts(2) = mod((rank / psizes(2)), psizes(2))
starts(3) = mod((rank / (psizes(1) * psizes(2))), psizes(3))
bbufsize = 1
do i=1,NDIMS
gsizes(i) = len * psizes(i)
starts(i) = starts(i) * len + 1
counts(i) = len
bbufsize = bbufsize * len
enddo
do i=1,NUM_VARS
do j=1,BUFSIZE
buf(j,i) = rank
enddo
enddo
! set an MPI-IO hint to disable file offset alignment for
! fixed-size variables
call MPI_Info_create(info, err)
call MPI_Info_set(info, "nc_var_align_size", "1", err)
! create file, truncate it if exists
cmode = IOR(NF_CLOBBER, NF_64BIT_DATA)
err = nfmpi_create(MPI_COMM_WORLD, filename, cmode,
+ info, ncid)
call check(err, 'In nfmpi_create: ')
call MPI_Info_free(info, err)
! define dimensions
do i=1, NDIMS
write(str,'(I1)') i-1
err = nfmpi_def_dim(ncid, "x"//str,
+ gsizes(i), dimids(i))
call check(err, 'In nfmpi_def_dim x'//str)
enddo
!define variables
do i=1, NUM_VARS
write(str,'(I1)') i-1
err = nfmpi_def_var(ncid, "var"//str,
+ NF_INT, NDIMS, dimids, varids(i))
call check(err, 'In nfmpi_def_var var'//str)
enddo
! do not forget to exit define mode
err = nfmpi_enddef(ncid)
call check(err, 'In nfmpi_enddef: ')
! write one variable at a time using iput
do i=1, NUM_VARS
do j=1,BUFSIZE
buf1d(j) = buf(j,i)
enddo
write(str,'(I1)') i-1
err = nfmpi_iput_vara_int(ncid, varids(i), starts,
+ counts, buf1d, req(i))
call check(err, 'In nfmpi_iput_vara_int '//str)
enddo
! wait for the nonblocking I/O to complete
err = nfmpi_wait_all(ncid, NUM_VARS, req, st)
call check(err, 'In nfmpi_wait_all')
! check the status of each nonblocking request
do i=1, NUM_VARS
write(str,'(I1)') i-1
call check(st(i), 'In nfmpi_wait_all req '//str)
enddo
! write one variable at a time using bput
! bbufsize must be max of data type converted before and after
bbufsize = bbufsize * NUM_VARS * 4 ! 4 is size of integer
err = nfmpi_buffer_attach(ncid, bbufsize)
call check(err, 'In nfmpi_buffer_attach')
do i=1, NUM_VARS
do j=1,BUFSIZE
buf1d(j) = buf(j,i)
enddo
write(str,'(I1)') i-1
err = nfmpi_bput_vara_int(ncid, varids(i), starts,
+ counts, buf1d, req(i))
call check(err, 'In nfmpi_bput_vara_int '//str)
! can safely change the contents of buf(:,i) now
enddo
! wait for the nonblocking I/O to complete
err = nfmpi_wait_all(ncid, NUM_VARS, req, st)
call check(err, 'In nfmpi_wait_all')
! check the status of each nonblocking request
do i=1, NUM_VARS
write(str,'(I1)') i-1
call check(st(i), 'In nfmpi_wait_all req '//str)
enddo
! detach the temporary buffer
err = nfmpi_buffer_detach(ncid)
call check(err, 'In nfmpi_buffer_detach')
! close the file
err = nfmpi_close(ncid)
call check(err, 'In nfmpi_close')
! check if there is any PnetCDF internal malloc residue
998 format(A,I13,A)
err = nfmpi_inq_malloc_size(malloc_size)
if (err .EQ. NF_NOERR) then
call MPI_Reduce(malloc_size, sum_size, 1, MPI_INTEGER8,
+ MPI_SUM, 0, MPI_COMM_WORLD, err)
if (rank .EQ. 0 .AND. sum_size .GT. 0)
+ print 998,
+ 'heap memory allocated by PnetCDF internally has ',
+ sum_size/1048576, ' MiB yet to be freed'
endif
999 call MPI_Finalize(err)
! call EXIT(0) ! EXIT() is a GNU extension
end
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