[RegCNET] Parallel computing problem

[XUNQIANG BI]

Hi, Wu Guangyu:

For parallel computing, mostly, the purpose is to run
a big domain (high resolution) case.

If you try a 256x256 domain, you will find the speed up
is quite reasonable. In my opinion, there is no problem
for your benchmark. If you change to check the other model
(like MM5 or WRF) the parallel performance, I think you
will get similar speed up results.

By the way, do you mean your cluster is just connected by
several desktop PC ? If yes, I think your results are quite
good.

Regards,
Xunqiang
On Thu, 8 Mar 2007, Guangyu Wu wrote:

> Dear All,
>
> I am running RegCM3.1 parallel version on a PC SUSE
> Linux cluster. I installed Mpich1.2.7 with Intel
> FC9.0, SSH and chp4 configuration. Then I compiled
> regcm using the default Makefile (Makefile_CL2, remove
> gmlib). My network is a 100M ethernet. I share regcm
> and ICBC files on the mater node to slave nodes
> through NFS.
>
> While using a 48x48 grid, I found the computing time
> for 4 nodes is almost same as 2 nodes. When I changed
> the domain size to 72x72 with same other
> configurations, the 4 nodes cluster is faster than two
> nodes, but almost same with 6 nodes.
>
> I am wondering it is a problem related to network and
> mpich setting, or this is a problem associated with
> regcm code itself.
>
> Hope someone can help me figure out a solution. Thanks
> very much in advance.
>
>
>
>
>
> ____________________________________________________________________________________
> Sucker-punch spam with award-winning protection.
> Try the free Yahoo! Mail Beta.
> http://advision.webevents.yahoo.com/mailbeta/features_spam.html
> _______________________________________________
> RegCNET mailing list
> RegCNET at lists.ictp.it
> https://lists.ictp.it/mailman/listinfo/regcnet
>

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   Dr. Xunqiang Bi         email:bixq at ictp.it
   Earth System Physics Group
   The Abdus Salam ICTP
   Strada Costiera, 11
   P.O. BOX 586, 34100 Trieste, ITALY
   Tel: +39-040-2240302  Fax: +39-040-2240449
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~