LAM uses a package called ROMIO for its MPI-2 I/O functionality.
Rajeev, one of the ROMIO maintainers, is a member of this list.
Rajeev -- can you comment on what is happening here?
On Jan 23, 2006, at 3:42 PM, Barry A. Croker wrote:
> Hello
> I've been working on using parallel I/O with FORTRAN 90. My code is
> working fine on my workstation, but I'm getting weird errors on our
> linux cluster writing to an NFS mounted volume. The program writes
> restart files using parallel I/O. The restart files are generally
> about 13 Mb each. Before I close the file I use MPI_FILE_GET_SIZE
> and the size is reported correctly for all processes which are
> writing the file (~13 Mb). However, when I list or copy or move the
> file on the NFS volume is is reported as 641 Gb (!). Strangely
> enough, when I do a df on the filesystem the massive file does not
> seem to appear, as the total disk usage is reported around 300 Gb.
> Is this a symptom of my NFS configuration, or could it be related to
> my code? Like I mentioned, the code works correctly on a workstation
> writing to a local hard disk.
> Thanks for anyone's input.
>
> BARRY A. CROKER, CAPT., USAF
> Research Aerospace Engineer
> Air Vehicles Directorate (AFRL/VAAC)
> Air Force Research Laboratory - Wright-Patterson AFB
> (937) 255-7876
>
>
>
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--
{+} Jeff Squyres
{+} The Open MPI Project
{+} http://www.open-mpi.org/
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