[mpich-discuss] quad core mpich2 sluggish (Zach)

[Reuti]

Am 28.12.2010 um 05:02 schrieb zach:

> on my home system I use mpiexec -n 4 ./exeFile after launching "mpd &".

Which version of MPICH2 - the new default startup mechanism is Hydra, so there is no mpd any more.


> on the cluster i use PBS via a qsub command with number of nodes desired 

Fine, but what command do you use inside the jobscript then?

-- Reuti


> Message: 1
> Date: Mon, 27 Dec 2010 13:53:38 +0100
> From: Reuti <reuti at staff.uni-marburg.de>
> Subject: Re: [mpich-discuss] quad core mpich2 sluggish
> To: mpich-discuss at mcs.anl.gov
> Message-ID:
>        <C11B1403-7D5C-4E57-80C7-CE31F5640D1E at staff.uni-marburg.de>
> Content-Type: text/plain; charset=us-ascii
> 
> Hi,
> 
> Am 24.12.2010 um 19:33 schrieb zach:
> 
> > I am running the latest ubuntu with a Q6600 quad core cpu and the mpich2 that came with ubuntu
> > I can run my parallelized code over the four cores (i see it in 'top')
> > however, the speed increase over a single process is hardly improved for 2,3, or even 4 processes.
> >
> > i was able to run the same code on a linux cluster through my school with speed increases as expected.
> > am i doing something wrong?
> 
> do you start it in the same way on both machines - what command do you use?
> 
> -- Reuti
> 
> 
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