On Mar 14, 2014, at 11:23 AM, Rob Latham <[email protected]> wrote:

I thought we handled this? we certianly seem to have made an effort:

https://trac.mpich.org/projects/mpich/browser/src/mpi/romio/adio/common/ad_f...

Sorry for the delay in getting back to this... It looks like ADIO_FileSysType_fncall() is *not* collective -- it just does some magic to figure out what the local filesystem type is. Then back up in ADIO_ResolveFileType(), since have_nfs_enabled==1 and ADIO_FileSysType_fncall() returned MPI_SUCCESS, MPI_Allreduce() is *not* called, and each process just proceeds with their local value for file_system. That's where things go downhill: one process will get UFS, the rest will get NFS. -- Jeff Squyres [email protected] For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/