[Pw_forum] parallel computation too slow

[Axel Kohlmeyer]

On Mon, Mar 19, 2012 at 1:38 PM, Paolo Giannozzi <giannozz at democritos.it> wrote:
> On Mon, 2012-03-19 at 15:05 +0000, Elie M wrote:
>
>> I am doing parallel computing on 3 nodes each with 8 processors
>> which is a total of 24 processors; this is why I am surprised
>>  that the calculation is slow
>
> there are two different aspects here:
> - how fast the algorithm is, and
> - how effective the parallelization is.

you forgot. how well can the available
hardware handle the calculation (RAM,
network speed, I/O speed, load from
other users).

axel.

> What are we talking about?
>
> P.
>
> --
> Paolo Giannozzi, IOM-Democritos and University of Udine, Italy
>
>
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-- 
Dr. Axel Kohlmeyer
akohlmey at gmail.com  http://goo.gl/1wk0

College of Science and Technology
Temple University, Philadelphia PA, USA.