[Pw_forum] timing vs QE version vs pools

Marino Vetuschi Zuccolini zucco at dipteris.unige.it
Mon Mar 9 13:17:24 CET 2009

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.


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
Corso Europa 26, 16132 - Genova - Italy

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