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!
! Copyright (C) by Argonne National Laboratory
! See COPYRIGHT in top-level directory
!
program main
implicit none
include 'mpif.h'
@F77MPIOINC@
! Fortran equivalent of perf.c
integer SIZE
parameter (SIZE=1048576*4)
! read/write size per node in bytes
integer buf(SIZE/4), j, mynod, nprocs, ntimes, flag
double precision stim, read_tim, write_tim, new_read_tim
double precision new_write_tim, min_read_tim, min_write_tim
double precision read_bw, write_bw
integer fh, status(MPI_STATUS_SIZE), ierr, argc, iargc, i
character*1024 str ! used to store the filename
@FORTRAN_MPI_OFFSET@ offset
ntimes = 5
min_read_tim = 10000000.0D0
min_write_tim = 10000000.0D0
call MPI_INIT(ierr)
call MPI_COMM_SIZE(MPI_COMM_WORLD, nprocs, ierr)
call MPI_COMM_RANK(MPI_COMM_WORLD, mynod, ierr)
! process 0 takes the file name as a command-line argument and
! broadcasts it to other processes
if (mynod .eq. 0) then
argc = @F77IARGC@
i = 0
@F77GETARG@
do while ((i .lt. argc) .and. (str .ne. '-fname'))
i = i + 1
@F77GETARG@
end do
if (i .ge. argc) then
print *
print *, '*# Usage: fperf -fname filename'
print *
call MPI_ABORT(MPI_COMM_WORLD, 1, ierr)
end if
i = i + 1
@F77GETARG@
call MPI_BCAST(str, 1024, MPI_CHARACTER, 0, &
& MPI_COMM_WORLD, ierr)
print *, 'Access size per process = ', SIZE, ' bytes', &
& ', ntimes = ', ntimes
else
call MPI_BCAST(str, 1024, MPI_CHARACTER, 0, &
& MPI_COMM_WORLD, ierr)
end if
offset = mynod*SIZE
do j=1, ntimes
call MPI_FILE_OPEN(MPI_COMM_WORLD, str, &
& MPI_MODE_CREATE+MPI_MODE_RDWR, MPI_INFO_NULL, fh, ierr)
call MPI_FILE_SEEK(fh, offset, MPI_SEEK_SET, ierr)
call MPI_BARRIER(MPI_COMM_WORLD, ierr)
stim = MPI_WTIME()
call MPI_FILE_WRITE(fh, buf, SIZE, MPI_BYTE, status, ierr)
write_tim = MPI_WTIME() - stim
call MPI_FILE_CLOSE(fh, ierr)
call MPI_BARRIER(MPI_COMM_WORLD, ierr)
call MPI_FILE_OPEN(MPI_COMM_WORLD, str, &
& MPI_MODE_CREATE+MPI_MODE_RDWR, MPI_INFO_NULL, fh, ierr)
call MPI_FILE_SEEK(fh, offset, MPI_SEEK_SET, ierr)
call MPI_BARRIER(MPI_COMM_WORLD, ierr)
stim = MPI_WTIME()
call MPI_FILE_READ(fh, buf, SIZE, MPI_BYTE, status, ierr)
read_tim = MPI_WTIME() - stim
call MPI_FILE_CLOSE(fh, ierr)
call MPI_ALLREDUCE(write_tim, new_write_tim, 1, &
& MPI_DOUBLE_PRECISION, MPI_MAX, MPI_COMM_WORLD, ierr)
call MPI_ALLREDUCE(read_tim, new_read_tim, 1, &
& MPI_DOUBLE_PRECISION, MPI_MAX, MPI_COMM_WORLD, ierr)
if (new_read_tim .lt. min_read_tim) then
min_read_tim = new_read_tim
end if
if (new_write_tim .lt. min_write_tim) then
min_write_tim = new_write_tim
end if
end do
if (mynod .eq. 0) then
read_bw = (SIZE*nprocs*1.0D0)/(min_read_tim*1000000.0D0)
write_bw = (SIZE*nprocs*1.0D0)/(min_write_tim*1000000.0D0)
print *, 'Write bandwidth without file sync = ', &
& write_bw, ' Mbytes/sec'
print *, 'Read bandwidth without prior file sync = ', &
& read_bw, ' Mbytes/sec'
end if
min_read_tim = 10000000.0D0
min_write_tim = 10000000.0D0
flag = 0
do j=1, ntimes
call MPI_FILE_OPEN(MPI_COMM_WORLD, str, &
& MPI_MODE_CREATE+MPI_MODE_RDWR, MPI_INFO_NULL, fh, ierr)
call MPI_FILE_SEEK(fh, offset, MPI_SEEK_SET, ierr)
call MPI_BARRIER(MPI_COMM_WORLD, ierr)
stim = MPI_WTIME()
call MPI_FILE_WRITE(fh, buf, SIZE, MPI_BYTE, status, ierr)
call MPI_FILE_SYNC(fh, ierr)
write_tim = MPI_WTIME() - stim
if (ierr .eq. MPI_ERR_UNKNOWN) then
flag = 1
end if
call MPI_FILE_CLOSE(fh, ierr)
call MPI_BARRIER(MPI_COMM_WORLD, ierr)
call MPI_FILE_OPEN(MPI_COMM_WORLD, str, &
& MPI_MODE_CREATE+MPI_MODE_RDWR, MPI_INFO_NULL, fh, ierr)
call MPI_FILE_SEEK(fh, offset, MPI_SEEK_SET, ierr)
call MPI_BARRIER(MPI_COMM_WORLD, ierr)
stim = MPI_WTIME()
call MPI_FILE_READ(fh, buf, SIZE, MPI_BYTE, status, ierr)
read_tim = MPI_WTIME() - stim
call MPI_FILE_CLOSE(fh, ierr)
call MPI_ALLREDUCE(write_tim, new_write_tim, 1, &
& MPI_DOUBLE_PRECISION, MPI_MAX, MPI_COMM_WORLD, ierr)
call MPI_ALLREDUCE(read_tim, new_read_tim, 1, &
& MPI_DOUBLE_PRECISION, MPI_MAX, MPI_COMM_WORLD, ierr)
if (new_read_tim .lt. min_read_tim) then
min_read_tim = new_read_tim
end if
if (new_write_tim .lt. min_write_tim) then
min_write_tim = new_write_tim
end if
end do
if (mynod .eq. 0) then
if (flag .eq. 1) then
print *, 'MPI_FILE_SYNC returns error.'
else
read_bw = (SIZE*nprocs*1.0D0)/(min_read_tim*1000000.0D0)
write_bw = (SIZE*nprocs*1.0D0)/(min_write_tim*1000000.0D0)
print *, 'Write bandwidth including file sync = ', &
& write_bw, ' Mbytes/sec'
print *, 'Read bandwidth after file sync = ', &
& read_bw, ' Mbytes/sec'
end if
end if
call MPI_FINALIZE(ierr)
end
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