- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
I'm using MPI_FILE_WRITE_SHARED to write some error output to a single file. NFS is used so that all nodes write/read to the same files. When I run the program on any single node with multiple processes, error output occurs correctly. However, when I run the code across multiple nodes, nothing get written to the file. Here's a simple test program
Program MPIwriteTest use mpi implicit none integer mpiFHerr, mpiErr, myRank character (len=80) string character(len=2), parameter:: CRLF = char(13)//char(10) ! Initialze MPI and get rank call MPI_INIT( mpierr ) call MPI_COMM_RANK(MPI_COMM_WORLD, myRank, mpierr) ! open and close file MPIerror.dat to delete any existing file call MPI_FILE_OPEN(MPI_COMM_WORLD, 'MPIerror.dat', MPI_MODE_WRONLY+MPI_MODE_CREATE+MPI_MODE_SEQUENTIAL+MPI_MODE_DELETE_ON_CLOSE, & MPI_INFO_NULL, mpiFHerr, mpiErr) call MPI_FILE_CLOSE(mpiFHerr, mpiErr) ! This will delete the file. ! open but don't delete on close call MPI_FILE_OPEN(MPI_COMM_WORLD, 'MPIerror.dat', MPI_MODE_WRONLY+MPI_MODE_CREATE+MPI_MODE_SEQUENTIAL, & MPI_INFO_NULL, mpiFHerr, mpiErr) ! test code just just does simple write write(string,'(a,i0)') 'Error from process: ', myRank call MPI_FILE_WRITE_SHARED(mpiFHerr, trim(string)//CRLF, len_trim(string)+2, MPI_CHARACTER, MPI_STATUS_IGNORE, mpiErr) ! close and end call MPI_FILE_CLOSE(mpiFHerr, mpiErr) call MPI_FINALIZE(mpierr) end program MPIwriteTest
I've also noticed if the file already exists (and I don't do the open and delete_on_close), then the file contains text, but sometime the file is corrupt. Is there something wrong in this code? Is MPI not playing well with NFS?
BTW, I'm using parallel studio xe 2019 update 4 cluster ed.
thanks, -joe
Link Copied
1 Reply
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Seems to have been fixed with Update 5. Cool.
![](/skins/images/7FC17B7B85029576C25F1E43CE255B51/responsive_peak/images/icon_anonymous_message.png)
Reply
Topic Options
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page