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

• To: Rob Latham <robl@xxxxxxxxxxx>
• Subject: Re: [netcdfgroup] parallel I/O testing with MVAPICH2
• From: Dan Kokron <daniel.kokron@xxxxxxxx>
• Date: Wed, 22 Sep 2010 12:27:15 -0400

Sigh, user error.

My arrays is 5760x1441x72x4bytes to be exact.  Solution, run on more
than two processes.

Thanks

Dan

On Wed, 2010-09-22 at 01:06 -0500, Rob Latham wrote:
> 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
> 
-- 
Dan Kokron
Global Modeling and Assimilation Office
NASA Goddard Space Flight Center
Greenbelt, MD 20771
Daniel.S.Kokron@xxxxxxxx
Phone: (301) 614-5192
Fax:   (301) 614-5304

• References:
  • [netcdfgroup] parallel I/O testing with MVAPICH2
    • From: Dan Kokron
  • Re: [netcdfgroup] parallel I/O testing with MVAPICH2
    • From: Rob Latham