Bummer. I know there's some kind of issue with the "noac" NFS value
(no attribute caching; when I enabled that on my cluster, my entire
cluster got veeerrrrryyy slooooowww with regards to NFS).
We unfortunately don't have much ROMIO expertise here on the OMPI
list; we pretty much import it from MPICH. You might want to ping
the MPICH list because it contains the ROMIO authors.
Sorry I don't have a better answer... :-\
On Jul 2, 2007, at 7:49 PM, Adams, Samuel D Contr AFRL/HEDR wrote:
I wrote a code the other day to MPI IO to write files, and OpenMPI/
ROMIO
seems to be having problems with the NFS server. I have read that
NFSv4
and ROMIO don't perform very well together, but my problem is
probably a
misconfiguration of some kind. Basically when I use MPI IO to write a
file on an exported file system, it basically hangs. If I try to
run it
to a local file system, it works great. I also get mixed results
depending on which MPI I am using with our NFS server. Sometimes my
code will work ok with some MPI implementations using the same NFS
server, and other times it will hang like it does with OpenMPI which
seems odd since I think MPICH, LAM-MPI, and OpenMPI all use ROMIO.
Anyway, so if anyone can tell me how I should configure my NFS server,
or OpenMPI to make ROMIO work properly, I would appreciate it.
Sam Adams
General Dynamics Information Technology
Phone: 210.536.5945
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Jeff Squyres
Cisco Systems
