I dont think so, we are using the hdf5 serial io module, our hosts
have just 1 gb ethernet and our OSS has gigbit also. But again our
lustre setup is brand-new with only a few users so its effectively Idle.
We also see the same behavior on NFS v3 backed by OnStor bobcats.
Brock Palen
Center for Advanced Computing
bro...@umich.edu
(734)936-1985
On Jan 25, 2008, at 5:01 PM, Jeff Pummill wrote:
Brock,
The only thing that came to mind was that possibly on the second
dump, the I/O was substantial enough to cause an overload of the
OSS's (I/O servers) resulting in a process or task hang? Can you
tell if your Lustre environment is getting overwhelmed when the
Open MPI / FLASH combination checkpoints the second time? I know
you write files > 2gb all the time, but if this particular
combination is delivering that amount of data in a much shorter
period of time.....
Just a thought :-\
Jeff F. Pummill
University of Arkansas
Brock Palen wrote:
I started a new run with some changes,
Shortening the run wont work well, it takes 3 days just to get
through the AMR.
Brock Palen
Center for Advanced Computing
bro...@umich.edu
(734)936-1985
On Jan 25, 2008, at 3:01 PM, Daniel Pfenniger wrote:
Hi,
Brock Palen wrote:
Is anyone using flash with openMPI? we are here, but when ever it
tries to write its second checkpoint file it segfaults once it gets
to 2.2GB always in the same location.
Debugging is a pain as it takes 3 days to get to that point. Just
wondering if anyone else has seen this same behavior.
Just to make testing faster you might think reducing the file output
interval (trstrt or nrstrt parameters in flash.par), and decrease
the
resolution (lrefine_max) to produce smaller files and to see whether
the problem is related with the file size.
Dan
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