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.
General Dynamics Information Technology