[Pw_forum] timing vs QE version vs pools

[Marino Vetuschi Zuccolini]

Dear Giovanni,
I'm testing our system with more or less the same configuration. Can  
you send me the input you used in testing your cluster?

Many thanks.

m.

On 6 Mar 2009, at 18:15, Giovanni Cantele wrote:

> Dear all,
>
> I just finished some timing tests relative to QE, stimulated by recent
> discussions in this forum.
> I would like to share these tests, and ask  a couple of simple (?)
> questions.
>
> Up to now, even if not supported by systematic tests, my feeling has
> been that
> for the kind of runs I'm doing on the kind of cluster(s) I'm using,  
> the
> following rules hold:
>
> i) if using a relatively "small" number of CPUs, pools are rather
> ineffective, I often realized that
> using pools actually increased job execution time
>
> ii) diagonalization parallelism (-ndiag XX) is ineffective as well
>
> iii) version 3.2.3 is "better" than 4.0.4
>

...

*******************************************************
Marino Vetuschi Zuccolini
zucco at dipteris.unige.it
Researcher / Geochemist
Laboratory of Geochemistry

DIPartimento per lo studio della TErra e delle sue RISorse -  
Università  di Genova
Tel. ++39 010 3538136 Fax. ++39 010 352169
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