[Pw_forum] Insufficient Virtual Memory

[Vo, Trinh]

Dear Lorenzo,

Thanks for your comments.  I will go and have a look at it.  If I have any further questions, I'll post it to PWSCF forum again.

Trinh

-----Original Message-----
From: pw_forum-bounces at pwscf.org [mailto:pw_forum-bounces at pwscf.org] On Behalf Of Lorenzo Paulatto
Sent: Thursday, February 26, 2009 2:04 PM
To: PWSCF Forum
Subject: Re: [Pw_forum] Insufficient Virtual Memory


On Gio, Febbraio 26, 2009 21:23, Vo, Trinh wrote:
>  512 H2O with 4cores/node,

Dear Trinh Vo,
to be honest, I don't think you have much chance to run a system with
~3500 electrons on 78 processors with only 1GB of RAM/processor. You may
try using half the processors and 2GB each (leaving half of them idle),
but this will probably take a painfully long time.

My suggestion is to have a look at two recent threads from the mailing
list archives: "PW taskgroups and a large run on a BG/P" and "Trying to
find reasonable parallelization parameters" where the problem of computing
large systems have been discussed extensively.

regards

-- 
Lorenzo Paulatto
SISSA  &  DEMOCRITOS (Trieste)
phone: +39 040 3787 511
skype: paulatz
www:   http://people.sissa.it/~paulatto/



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