[mpich-discuss] mpi-io mkdir

[Rajeev Thakur]

John,
         Directory operations aren't there mainly because no one made a concrete proposal for them in the Forum.

Rajeev

On Mar 31, 2011, at 8:18 PM, John Bent wrote:

> Hello,
> 
> Just curious why there aren't MPI_Directory_* commands in MPI-IO.
> 
> The reason we are asking now is that PLFS will be available on LANL's
> new Cielo supercomputer.  PLFS is available as both a POSIX filesystem
> using FUSE and as an ADIO layer and as an API.  We have user codes that
> currently query and create sub-directories for their output files.  On
> most of our machines, this works just fine as they do the directory
> manipulation through the POSIX filesystem and the parallel IO through
> the MPIIO interface.
> 
> Unfortunately, on LANL's new Cielo supercomputer, FUSE is available only
> on the login nodes and NOT on the compute nodes.  This means the above
> workload fails on the directory operations since the virtual path to
> PLFS files is NOT available through a mounted filesystem.  We currently
> are asking the codes to use the plfs_* directory functions as a
> workaround but obviously they'd prefer a pure MPI-IO solution.
> 
> Now all this is very specific to PLFS and our limited compute
> environment on Cielo but perhaps this is a more general concern?
> Probably it's been discussed before but I couldn't find anything in the
> list archives.
> -- 
> Thanks,
> 
> John 
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