Rob is definitely correct.. The question that I should have asked also in the previous email:
Is there a reason why you are using the mpiposix VFD and not the mpiio VFD?

Mohamad

On 5/25/2012 11:09 AM, Rob Latham wrote:
On Fri, May 25, 2012 at 09:41:57AM -0500, Mohamad Chaarawi wrote:
Probably what you want is create n datasets, and have each process
write to each dataset?
I guess this is MPIPOSIX, so nothing clever can happen?

or create 1 4xn, or nx4 dataset and have each process select a
portion of the dataset to write and read from?
If you use MPIIO, doing things this way gets you a lot of
optimizations.  I imagine one day you'll want to scale up beyond 4
processors..



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