filename prefixes

[Don Morton]

On Wed, Aug 11, 2010 at 3:47 PM, Gerald Creager <gerry.creager at tamu.edu>wrote:

> On the system I'm working with, I can't use the MPICH envVars such as:
> MPICH_MPIIO_HINTS_DISPLAY 1
> MPICH_MPIIO_HINTS “wrfout*:striping_factor=64”
>
> Therefore, to set striping on the wrfout files, with a Lustre file system
> and SGE for the batch queuing environment, I've gotta find where the wrfout
> file creation instance occurs and add a couple lines of code to make it
> create the wrfouts with stripe-counts appropriately set (somewhere between
> 16-64, I think). What I intend to do eventually, is to get that folded back
> into WRF as a namelist parameter, so that those of us using pnetcdf (needed
> if proc count gets past ~512 or so on this system) can have a simplified
> granular method of using striping on parallel file systems (specifically
> with pnetcdf).
>
> I've looked at Johnsen's work to use Lustre on the Cray XT5. It dowsn't
> apply to my environment, more's the pity.
>
>

I see.  It was Pete Johnsen who helped me out, on our XT5, so it doesn't
sound like I have any info that would help you...


-- 
Arctic Region Supercomputing Center
http://weather.arsc.edu/
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