Robert Latham wrote: > On Thu, Sep 25, 2008 at 09:19:41PM -0400, Nirmal Thacker wrote: > >> Hello >> >> I am trying to use LLNL's mdtest >> [http://sourceforge.net/projects/mdtest/] on pvfs2. >> >> It works by passing an argument to the test indicating which directory >> the test must run. However when I do indicate the directory as >> /mnt/pvfs2 - the test runs on the local directory and doesn't use PVFS2. >> If I do add the prefix , as "pvfs2:/mnt/pvfs2" , the test reports back >> that it cannot find the filesystem. Although my mpich libraries are >> linked with the pvfs2 libraries. >> >> Any ideas about this? >> > > Yep, LLNL''s mdtest uses MPI for coordination but POSIX for metadata, > so the 'pvfs2:' prefix won't work for that test (it works for the > mpi-md-test in the PVFS CVS). > > What version of mdtest are you using? You are giving mdtest the '-d' > option? I can't think of a reason for mdtest to ignore your testdir > option and start doing stuff in the local directory... > I apologize for the delay in replying.
I use version 1.7.4 - which seems to be the latest build on their sourceforge page. The mdtest does not ignore my prefix option. Here's what happens. AFAIK, while using PVFS2 on a cluster there is no requirement to perform a mount operation. As I understand since the MPICH binaries are linked to the PVFS2 libraries, the MPI app/bechmark would understand how to locate the PVFS2 storage servers [apart from the /etc/pvfs2tab content] . Hence there exists a directory /mnt/pvfs2 on each of my compute nodes. When I run mdtest with a directory prefix -d to /mnt/pvfs2 , I had a bunch of files generated while the pvfs2-ls contents do not show any thing. On the other hand, running it with a prefix reports back an error that the filesystem cannot be found Anyways, for now, I have had the mpi-md-test up and running. As it turns out I am not using a very recent build of PVFS2. My build is PVFS2-1.5.1 . However tests from the later builds do seem to compile without any dependencies and work fine. Thanks for the replies Nirmal > ==rob > > _______________________________________________ Pvfs2-users mailing list [email protected] http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users
