Re: [netcdfgroup] parallel I/O testing with MVAPICH2

• To: Dan Kokron <daniel.kokron@xxxxxxxx>
• Subject: Re: [netcdfgroup] parallel I/O testing with MVAPICH2
• From: Rob Latham <robl@xxxxxxxxxxx>
• Date: Wed, 22 Sep 2010 09:06:55 +0300

On Tue, Sep 21, 2010 at 04:07:01PM -0400, Dan Kokron wrote:
> I am comparing parallel I/O performance between NetCDF-4 and direct
> MPI-IO.  I modified the ~netcdf/nc_test4/tst_nc4perf.c to add parameter
> scans for direct MPI-IO calls.  It works fine on the discover platform
> using Intel MPI, but fails when using MVAPICH2-1.5.1p1.
> 
> Any ideas?

I can tell you what the error message suggests: that you are accessing
more than 2 GB of data in a single call on a platform where an int is
32 bits.  True?

==rob

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

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    • From: Dan Kokron