MPI Failure at line 839 of nonblocking.c (MPI_File_write_all : MPI_ERR_IO: input/output error)

[Jim Edwards]

I have my buffer limit set to 100MB so the maximum is well below 2GB
and I see that the location of the error with respect to my code varies as
I vary this limit.



On Wed, Aug 8, 2012 at 2:27 PM, Rob Latham <robl at mcs.anl.gov> wrote:

> On Wed, Aug 08, 2012 at 02:17:19PM -0600, Jim Edwards wrote:
> > I am getting this error from parallel-netcdf using openmpi 1.4.5 and
> intel
> > 12.1.4 and a lustre filesystem.   Because this is
> > non-blocking I am having a lot of difficulty pinpointing the issue, do
> you
> > have any suggestions?  I buffer multiple variables before
> > calling the nfmpi_wait_all and if I turn off this buffering functionality
> > it appears to work fine.     All of this functionality works on several
> > other systems so I
> > think that it must be an issue lower in the software stack.
>
> How much data are you working on in total?   Sometimes this
> "MPI_ERR_IO: input/output error" comes from reading or writing more
> than 2 GiB of data in a single call.
>
> ==rob
>
> --
> Rob Latham
> Mathematics and Computer Science Division
> Argonne National Lab, IL USA
>



-- 
Jim Edwards

CESM Software Engineering Group
National Center for Atmospheric Research
Boulder, CO
303-497-1842
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