[Clas_offline] Fwd: [Jlab-scicomp-briefs] JLab Analysis Cluster: CentOS 5.3 64-bit upgrade; 32-bit Fedora EOL

[Dennis Weygand]

Begin forwarded message:

> From: Sandy Philpott <Sandy.Philpott at jlab.org>
> Date: June 25, 2010 9:32:41 AM EDT
> To: jlab-scicomp-briefs at jlab.org
> Cc: "scicomp at jlab.org" <scicomp at jlab.org>
> Subject: [Jlab-scicomp-briefs] JLab Analysis Cluster: CentOS 5.3 64-bit upgrade; 32-bit Fedora EOL
> Reply-To: Sandy.Philpott at jlab.org
> 
> The JLab analysis cluster is upgrading entirely to CentOS 5.3 64-bit
> computing by the end of 2010; all 32-bit Fedora systems are at end-of-
> life and will be completely decommissioned in the coming months. Newer 
> nodes have a total of 5 times the capacity of the old: the new
> processors are twice as fast, and run 12 jobs instead of 5 like most of 
> the 32-bit nodes. The nodes are also more energy efficient.
> 
> Interactive user systems, available via the 'ifarml64' alias, include
> ifarml6 and ifarml1.  64-bit batch nodes include 50 Nehalem systems with 
> 24GB RAM and 8 cores with hyperthreading on, plus a small number of AMD 
> 8-core systems with 8GB RAM.
> 
> Use the OS: linux64 tag to access these nodes. 32-bit codes may be run 
> on the 64-bit systems by setting LD_LIBRARY_PATH appropriately.
> 
> Additionally, multi-threaded jobs are now supported, using the tag CPU:
> x,  where x is the number of cores requested.  These jobs will likely
> need to increase their memory request over the default setting, using
> the MEMORY: xxx tag.
> 
> The first group of farm nodes scheduled for removal will be by the end
> of FY10 in September. An FY11 purchase of compute nodes is anticipated
> in the fall before the final nodes are removed.  These nodes will have 
> another 2 times in throughput, thus ~10 times better throughput than 
> most of the 32-bit nodes.
> 
> Currently there are almost 700 job slots in the 64-bit queue, with less 
> than 500 in the 32-bit queue. Cluster usage graphs are available at
> http://scicomp.jlab.org/farm/stat/job.faces .
> 
> 
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--
Dennis Weygand
weygand at jlab.org
(757) 269-5926



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