Sorry for not replying earlier -- going on vacation for a few days
really puts you behind in e-mail. :-)
I think that we should have a simple way to look up at least
*something* about ROMIO in ompi_info. Perhaps we can easily snarf
the flags provided to --with-io-romio-flags and put that in an MCA
parameter that would then be query-able through ompi_info.
Rob -- is there a public constant/symbol somewhere where we can
access some form of ROMIO's version number? If so, we can also make
that query-able via ompi_info.
On Sep 14, 2007, at 1:53 PM, Tim Prins wrote:
Hi,
To give FLAGS to the ROMIO configuration script, the configure option
for Open MPI is:
--with-io-romio-flags=FLAGS
So something like:
--with-io-romio-flags="--with-filesystems=ufs+nfs+pvfs2"
should work, though I have not tested it.
You can see all the ROMIO configure flags by running:
./ompi/mca/io/romio/romio/configure --help
from the top directory of the Open MPI source.
If you want to see what file systems support has been built for, you
should just be able to look in the config.log for ROMIO:
grep FILE_SYSTEM ./ompi/mca/io/romio/romio/config.log
I am not an expert in this area, but I hope this helps.
Tim
Robert Latham wrote:
On Fri, Sep 07, 2007 at 10:18:55AM -0400, Brock Palen wrote:
Is there a way to find out which ADIO options romio was built with?
not easily. You can use 'nm' and look at the symbols :>
Also does OpenMPI's romio come with pvfs2 support included? What
about Luster or GPFS.
OpenMPI has shipped with PVFS v2 support for a long time. Not sure
how you enable it, though. --with-filesystems=ufs+nfs+pvfs2 might
work for OpenMPI as it does for MPICH2.
All versions of ROMIO support Lustre and GPFS the same way: with the
"generic unix filesystem" (UFS) driver. Weikuan Yu at ORNL has been
working on a native "AD_LUSTRE" driver and some improvements to ROMIO
collective I/O. Likely to be in the next ROMIO release.
For GPFS, the only optimized MPI-IO implementation is IBM's MPI for
AIX. You're likely to see decent performance with the UFS driver,
though.
==rob
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Jeff Squyres
Cisco Systems
