Thanks Rob. That make sense. I will see if i can track the error more.<br>Hos<br><br><br><div class="gmail_quote">On Mon, Mar 15, 2010 at 10:50 AM, Rob Latham <span dir="ltr"><<a href="mailto:robl@mcs.anl.gov">robl@mcs.anl.gov</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div class="im">On Sun, Mar 14, 2010 at 02:56:53PM -0400, hossam wrote:<br>
> Now, to make things clearer: When i use ROMIO (MPI IO) it got stuck during<br>
> opining the file (MPI_FILE_OPEN).<br>
><br>
> However, i tried regular open(....) at the root processor and then reducing<br>
> the data to the root processor and write there. The code got stuck at the<br>
> MPI_REDUCE call.<br>
<br>
</div>You seem to be having problems with the collective routines. It sounds<br>
like one or more of your processors are perhaps off doing something<br>
else while one or more try to open the file.<br>
<br>
If you stick a few print statements in your code and maybe an<br>
MPI_BARRIER, I suspect you'll be able to track down which process or<br>
processes are still in the computation phase.<br>
<br>
==rob<br>
<font color="#888888"><br>
--<br>
Rob Latham<br>
Mathematics and Computer Science Division<br>
Argonne National Lab, IL USA<br>
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