on my home system I use mpiexec -n 4 ./exeFile after launching "mpd &".<br>on the cluster i use PBS via a qsub command with number of nodes desired <br><br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<br>
Message: 1<br>
Date: Mon, 27 Dec 2010 13:53:38 +0100<br>
From: Reuti <<a href="mailto:reuti@staff.uni-marburg.de">reuti@staff.uni-marburg.de</a>><br>
Subject: Re: [mpich-discuss] quad core mpich2 sluggish<br>
To: <a href="mailto:mpich-discuss@mcs.anl.gov">mpich-discuss@mcs.anl.gov</a><br>
Message-ID:<br>
<<a href="mailto:C11B1403-7D5C-4E57-80C7-CE31F5640D1E@staff.uni-marburg.de">C11B1403-7D5C-4E57-80C7-CE31F5640D1E@staff.uni-marburg.de</a>><br>
Content-Type: text/plain; charset=us-ascii<br>
<br>
Hi,<br>
<br>
Am 24.12.2010 um 19:33 schrieb zach:<br>
<br>
> I am running the latest ubuntu with a Q6600 quad core cpu and the mpich2 that came with ubuntu<br>
> I can run my parallelized code over the four cores (i see it in 'top')<br>
> however, the speed increase over a single process is hardly improved for 2,3, or even 4 processes.<br>
><br>
> i was able to run the same code on a linux cluster through my school with speed increases as expected.<br>
> am i doing something wrong?<br>
<br>
do you start it in the same way on both machines - what command do you use?<br>
<br>
-- Reuti<br>
<br></blockquote></div><br>