Changes planned to the JHPCE cluster for Sunday, September 28, 2014

Dear JHPCE Cluster Community,

We are planning on making a couple of changes to the JHPCE cluster during the evening of Sunday, September 28, 2014.  The cluster will remain available during these changes, and we do not anticipate any interruption to jobs running on the cluster.

– We will be installing a number of security patches on the nodes of the JHPCE cluster, primarily to fix the bug in the bash shell known as the “ShellShock” vulnerability.

–  We will be changing the default setting for mem_free from 5GB to 2GB, and h_vmem from 6GB to 3GB for jobs submitted to the cluster.  We have found that 98% of jobs that request the default 5GB of RAM use less than 2GB, hence a good bit of RAM gets requested but unused by default.  We will be making this change by modifying individual’s .sge_request file.  If you have modified this file, we will not be touching your modifications, only the 5GB default setting will be changed.  The change has become more important with the recent change that made RAM a consumable resource on the cluster.

Please let us know if you have any questions.

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