[Pw_forum] Trying to find reasonable parallelization parameters

[J. J. Ramsey]

----- Original Message ----

> From: Axel Kohlmeyer <akohlmey at cmm.chem.upenn.edu>
> To: J. J. Ramsey <jjr19 at uakron.edu>
> Cc: PWSCF <pw_forum at pwscf.org>
> Sent: Thursday, January 22, 2009 1:37:00 PM
> Subject: Re: [Pw_forum] Trying to find reasonable parallelization parameters

> very simple. -npools can be maximally the actual number of k-points that 
> you are using, and that should be exploited to the maximum. a second 
> option to pay attention to, is the disk_io flag. setting this to 'low' 
> can have a very positive effect on scaling at the expense of additional 
> memory use.

Well, I'm trying to *reduce* memory usage per processor, so I'm leery of lowering the disk-IO. What I'd like to do is try to distribute the memory for the job as much as possible.