[CIG-MC] CitcomS on Teragrid

Magali Billen mibillen at ucdavis.edu
Wed Jan 19 13:52:18 PST 2011

Hello Benjun,

One word of warning about using CitcomS on Ranger. We used CitcomCU on  
Lonestar and found that when we tried to use it on
Ranger that our models actually ran slower. We attributed this to the  
fact the Ranger is designed with many cores per node, but
only gigabit ethernet between the nodes and not enough sockets per  
node to allow for efficient exchange of information between nodes.
Lonestar didn't have this problem because it was only 2 cores per  
node, so it could handle exchanging the information between compute
nodes. The model we tested this for was running on about 380 cpus  
(cores) with about 50 million mesh nodes.

I don't know how big your models are but you might need to do some  
testing when you get things running to see what will run
efficiently on Ranger.

If anyone else on the list has experience with this, it would be great  
to hear what other advice their is for running on Ranger
(perhaps there's a compiling optimization that alleviates this  


On Jan 19, 2011, at 12:01 PM, Benjun Wu wrote:

> Hi,
> I want to use CitcomS on Teragrid. Now I have an accound on Ranger  
> at TACC. CitcomS was installed on Lonestar. But Lonestar is  
> upgrading to Lonestar4.  Does CIG group plan to install CitcomS on  
> Lonestar4 or Ranger? Thank you very much!
> Best Wishes,
> Benjun Wu
> Earth & Planetary Sciences
> Johns Hopkins University
> Baltimore,21218
> _______________________________________________
> CIG-MC mailing list
> CIG-MC at geodynamics.org
> http://geodynamics.org/cgi-bin/mailman/listinfo/cig-mc

Associate Professor & Chancellor Fellow, U.C. Davis
Department of Geology & KeckCAVES
2129 Earth & Physical Sciences Bldg
Davis, CA 95616

mibillen at ucdavis.edu
(530) 754-5696

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