Hints on improving performance with WRF and Pnetcdf

[Gerry Creager]

Rob Latham wrote:
> On Sat, Sep 04, 2010 at 09:25:12PM -0500, Gerry Creager wrote:
>> Ah, but I'm seeing the same thing on Ranger (UTexas). I'm likely
>> going to have to modify the WRF pnetcdf code to identify a
>> sufficiently large stripe count (Lustre file system) to see any sort
>> of real improvement.
> 
>> More to the point, I see worse performance than with normal Lustre
>> and regular netcdf. AND, there's no way to set MPI-IO-HINTS in the
>> SGE as configured on Ranger. We've tried and their systems folk
>> concur, so it's not just me saying it.
> 
> I know ranger's running openmpi, but can you give mpich2 a shot?  i
> only ask because recent mpich2 releases have an optimized lustre
> driver for collective i/o.

I'll see what we have. I've tried to use other mpich variants before...

Thanks, gerry

-- 
Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University
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