[Wien] lapw0 in parallel

[L. D. Marks]

15 minutes is really rather long. Are you compiling lapw0 with
optimizations turned on? For some of the routines this can have a big
effect, and I think lapw0 may be one of them.

On Fri, 22 Oct 2004, Stefaan Cottenier wrote:

>
> >I'm running a small linux cluster (7 computers) which is working
> flawlessly. However, 1/3 of
> >the time is taken in lapw0. I was therefore wondering if I should start
> running lapw0 in
> >parallel. Must I install MPI to do this, and is it worth it (lapw0 take 15
> minutes at the
> >moment). Would be nice if someone can give me instructions on how to
> proceed.
>
> Yes, you need MPI for that. But the easiest work-around is: if you have
> several independent jobs of this type, then start several of them
> simultaneously, not on 7 but on less machines. That will decrease the
> effective idle time of each machine. Ideally, if you can start 7 serial
> jobs, there will be no idle time at all.
>
> Stefaan
>
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-----------------------------------------------
Laurence Marks
Department of Materials Science and Engineering
MSE Rm 2036 Cook Hall
2225 N Campus Drive
Northwestern University
Evanston, IL 60201, USA
Tel: (847) 491-3996 Fax: (847) 491-7820
mailto:L-marks at northwestern.edu
http://www.numis.northwestern.edu
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