[Pw_forum] parallel computation too slow

[Paolo Giannozzi]

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.
What are we talking about?

P.

-- 
Paolo Giannozzi, IOM-Democritos and University of Udine, Italy