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

[zach]

how can i tell re: the thrashing?
Zach

Message: 3
> Date: Sun, 26 Dec 2010 05:29:31 -0600
> From: Pavan Balaji <balaji at mcs.anl.gov>
> Subject: Re: [mpich-discuss] quad core mpich2 sluggish
> To: mpich-discuss at mcs.anl.gov
> Cc: zach <zachlubin at gmail.com>
> Message-ID: <4D17271B.5070100 at mcs.anl.gov>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Zach,
>
> It's hard to tell what is going on based on the description below. Is
> your application thrashing memory/cache? Are you using the same problem
> size with increasing number of processes?
>
>  -- Pavan
>
> On 12/24/2010 12:33 PM, zach wrote:
> > 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?
> >
> > zach
> >
> >
> >
> > _______________________________________________
> > mpich-discuss mailing list
> > mpich-discuss at mcs.anl.gov
> > https://lists.mcs.anl.gov/mailman/listinfo/mpich-discuss
>
> --
> Pavan Balaji
> http://www.mcs.anl.gov/~balaji <http://www.mcs.anl.gov/%7Ebalaji>
>
>
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