Rajeev Thakur thakur at mcs.anl.gov
Wed Aug 29 13:35:02 CDT 2007

NFS performance for parallel I/O is usually bad because we have to disable
client-side caching to get the right consistency semantics. So we don't
recommend using NFS other than for testing and development. You can look
into using a real parallel file system such as PVFS (which is free).


> -----Original Message-----
> From: owner-mpich-discuss at mcs.anl.gov 
> [mailto:owner-mpich-discuss at mcs.anl.gov] On Behalf Of Adams, 
> Samuel D Contr AFRL/HEDR
> Sent: Wednesday, August 29, 2007 12:41 PM
> To: mpich-discuss at mcs.anl.gov
> Subject: [MPICH] ROMIO + NFS
> I have been getting very bad performance on a cluster that runs RHEL5
> and uses NFS for the file system.  As directed in the documentation, I
> have file systems mounted with the "noac" option.  Is there something
> else I am missing?
> Sam Adams
> General Dynamics Information Technology
> Phone: 210.536.5945

More information about the mpich-discuss mailing list