[mpich-discuss] MPI_File_open failed on NFS

[Rob Latham]

On Sat, May 16, 2009 at 10:26:16AM -0400, Yusong Wang wrote:
> We tried both 1.0.8 and 1.0.8p1 of MPICH2. We didn't experience the
> problem with the new versions. Does the new version use shared file
> pointer on NFS?

the new versions still use shared file pointers.  it's just that we
introduced an optimization in 1.0.5 that did not work so well for some
NFS workloads.  We reverted back to the old (correct) behavior in
1.0.6 and subsequent versions.

==rob

-- 
Rob Latham
Mathematics and Computer Science Division
Argonne National Lab, IL USA