[mpich-discuss] MPI I/O SLOW- possible conflicting with communication....code stuck for ever during IO

[hossam]

Thanks Rob. That make sense. I will see if i can track the error more.
Hos


On Mon, Mar 15, 2010 at 10:50 AM, Rob Latham <robl at mcs.anl.gov> wrote:

> On Sun, Mar 14, 2010 at 02:56:53PM -0400, hossam wrote:
> > Now, to make things clearer: When i use ROMIO (MPI IO) it got stuck
> during
> > opining the file (MPI_FILE_OPEN).
> >
> > However, i tried regular open(....) at the root processor and then
> reducing
> > the data to the root processor and write there. The code got stuck at the
> > MPI_REDUCE call.
>
> You seem to be having problems with the collective routines. It sounds
> like one or more of your processors are perhaps off doing something
> else while one or more try to open the file.
>
> If you stick a few print statements in your code and maybe an
> MPI_BARRIER, I suspect you'll be able to track down which process or
> processes are still in the computation phase.
>
> ==rob
>
> --
> Rob Latham
> Mathematics and Computer Science Division
> Argonne National Lab, IL USA
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