News & Announcements
*Revised* Infiniband Policy for Biowulf Cluster (Biowulf)
Date: 04 April 2008From: steven fellini (sfellini@NIH.GOV)
This announcement is directed primarily to users of the Infiniband network on the NIH Biowulf Cluster. In response to comments from several users, we have revised the IB-usage policy first announced Apr 1. There will no longer be a minimum allocation of 32 nodes. No changes to the way jobs are submitted are required. Jobs will be automatically directed to one of two pools, one reserved for "large" (64-128 processor) jobs, and one reserved for "small" (<64 processor) jobs. The systems staff will be able to dynamically adjust the size of the pools to allow for demand. You can determine the total number of processors in each pool by using the 'batchlim' command: $ batchlim (only the relevant lines are shown here) Max CPUs Max CPUs Per User Available ---------- ----------- ib2 48 74 ib 128 196 The "ib2" pool is for small jobs, the "ib" pool for large jobs. The batchlim output shows that there are 196 and 74 processors respectively assigned to the ib and ib2 pools. The maximum per-user limits are 128 and 48 processors respectively.