Hints on improving performance with WRF and Pnetcdf

[Rob Latham]

On Thu, Sep 02, 2010 at 06:23:42PM -0600, Craig Tierney wrote:
> I did try setting the hints myself by changing the code, and performance
> still stinks (or is no faster).  I was just looking for a way to not
> have to modify WRF, or more importantly have every user modify WRF.

What's going slowly?  

If wrf is slowly writing record variables, you might want to try
disabling collective I/O or carefully selecting the intermediate
buffer to be as big as one record.

That's the first place I'd look for bad performance.  

==rob

-- 
Rob Latham
Mathematics and Computer Science Division
Argonne National Lab, IL USA