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!
! Copyright (C) 2015, Northwestern University and Argonne National
! Laboratory
! See COPYRIGHT notice in top-level directory.
!
! $Id$
! This example tests PnetCDF's avoiding in-place Endianness byte swap when
! the user's write buffer is immutable, i.e. defined as PARAMETER.
!
! The compile and run commands are given below, together with an ncmpidump of
! the output file.
!
! % mpif77 -O2 -o put_parameter put_parameter.f -lpnetcdf
! % mpiexec -n 4 ./put_parameter /pvfs2/wkliao/testfile.nc
! % ncmpidump /pvfs2/wkliao/testfile.nc
! netcdf testfile {
! // file format: CDF-2 (large file)
! dimensions:
! X = 4 ;
! Y = 4 ;
! variables:
! int var1(Y, X) ;
! int var2(Y, X) ;
! data:
!
! var1 =
! 1, 2, 3, 4,
! 1, 2, 3, 4,
! 1, 2, 3, 4,
! 1, 2, 3, 4 ;
!
! var2 =
! 5, 6, 7, 8,
! 5, 6, 7, 8,
! 5, 6, 7, 8,
! 5, 6, 7, 8 ;
! }
!
! Note the above dump is in C order
!
INTEGER FUNCTION XTRIM(STRING)
CHARACTER*(*) STRING
INTEGER I, N
N = LEN(STRING)
DO I = N, 1, -1
IF (STRING(I:I) .NE. ' ') GOTO 10
ENDDO
10 XTRIM = I
END ! FUNCTION XTRIM
subroutine check(err, message)
implicit none
include "mpif.h"
include "pnetcdf.inc"
integer err, XTRIM
character*(*) message
character*128 msg
! It is a good idea to check returned value for possible error
if (err .NE. NF_NOERR) then
write(6,*) message(1:XTRIM(message)), nfmpi_strerror(err)
msg = '*** TESTING F77 put_parameter.f for immutable put '
call pass_fail(1, msg)
STOP 2
end if
end ! subroutine check
program main
implicit none
include "mpif.h"
include "pnetcdf.inc"
integer NX, buffer(4)
PARAMETER(NX=4)
data buffer /5,6,7,8/
character*256 filename, cmd, msg
integer err, ierr, nprocs, rank, nerrs, get_args, XTRIM
integer cmode, ncid, varid(2), dimid(2)
integer*8 len_ll, start(2), count(2)
integer*8 malloc_size, sum_size
call MPI_Init(ierr)
call MPI_Comm_rank(MPI_COMM_WORLD, rank, ierr)
call MPI_Comm_size(MPI_COMM_WORLD, nprocs, ierr)
! take filename from command-line argument if there is any
if (rank .EQ. 0) then
filename = "testfile.nc"
err = get_args(cmd, filename)
endif
call MPI_Bcast(err, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, ierr)
if (err .EQ. 0) goto 999
call MPI_Bcast(filename, 256, MPI_CHARACTER, 0,
+ MPI_COMM_WORLD, ierr)
nerrs = 0
! create file, truncate it if exists
cmode = IOR(NF_CLOBBER, NF_64BIT_OFFSET)
err = nfmpi_create(MPI_COMM_WORLD, filename, cmode,
+ MPI_INFO_NULL, ncid)
call check(err, 'In nfmpi_create: ')
! define dimensions x and y
len_ll = NX
err = nfmpi_def_dim(ncid, "X", len_ll, dimid(1))
call check(err, 'In nfmpi_def_dim X: ')
len_ll = nprocs
err = nfmpi_def_dim(ncid, "Y", len_ll, dimid(2))
call check(err, 'In nfmpi_def_dim Y: ')
! define 2D variables of integer type
err = nfmpi_def_var(ncid, "var1", NF_INT, 2, dimid, varid(1))
call check(err, 'In nfmpi_def_var for var1: ')
err = nfmpi_def_var(ncid, "var2", NF_INT, 2, dimid, varid(2))
call check(err, 'In nfmpi_def_var for var2: ')
! do not forget to exit define mode
err = nfmpi_enddef(ncid)
call check(err, 'In nfmpi_enddef: ')
! now we are in data mode
start(1) = 1
start(2) = rank + 1
count(1) = NX
count(2) = 1
!
! pgf77 does not like using (/1,2,3,4/) as a function argument
! err = nfmpi_put_vara_int_all(ncid, varid(1), start, count,
! + (/1,2,3,4/))
! call check(err, 'In nfmpi_put_vara_int_all: ')
!
err = nfmpi_put_vara_int_all(ncid, varid(2), start, count,
+ buffer)
call check(err, 'In nfmpi_put_vara_int_all: ')
!
! below will cause segmentation fault when in-place byte swap mode is
! explicitly enabled, because NX is immutable
!
! err = nfmpi_put_var1_int_all(ncid, varid(2), start, NX)
! call check(err, 'In nfmpi_put_var1_int_all: ')
! 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, ' bytes yet to be freed'
endif
if (rank .eq. 0) then
msg = '*** TESTING F77 '//cmd(1:XTRIM(cmd))//
+ ' for using immutable write buf '
call pass_fail(nerrs, msg)
endif
999 call MPI_Finalize(ierr)
if (nerrs .GT. 0) stop 2
end ! program main
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