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The new user disk space, /afs/slac.stanford.edu/g/glast/users, is gaining users and usage. Currently, 3 TB of disk space is allocated (of which about 1/2 is actually used) amongst 167 users. In addition, there are nine science groups with allocations totaling 345 GB. From this perspective, the new user space is a success.

Wiki MarkupHowever, a usage pattern for user space has emerged that is stressing the server. Submitting 100s of simultaneous batch jobs can cause the server to become non-responsive which, in turn, causes batch jobs to stall and eventually fail. In addition, interactive users attempting to access this space will be unsuccessful. The SLAC Computing Division has been alerted of this issue with the hope that a solution can be worked out. In the meantime, please be aware of the possibility that one can overload that server and affect other users. Batch jobs should be limited to prevent such overloading conditions. This can be done by dribbling in batch jobs a few at a time while \[monitoring the server\|[http://ganglia01.slac.stanford.edu:8080/ganglia/glast/?m=load_one&r=hour&s=descending&c=nfs-glast&h=sulky55.slac.stanford.edu&sh=1&hc=4]\]. When the CPU utilization exceed \ ~50%, you are entering the danger zone.

Pass 7.2 reprocessing

The first 14 months of survey data was reprocessed in October and November with the new Pass 7.2 event classification. The data sample extends from run 239557414 (2008-08-04 15:43:34 UT) through run 277596392 (2009-10-18 22:06:32 UT), spanning 6581 runs and including over 14 billion events. The C&A group is currently evaluating this reprocessed data and, depending on their findings, there may be another reprocessing cycle early next year. See the C&A pages for additional details: Pass7.2 planning, and Analysis User Forum.

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The LAT Workbook continues to evolve, expand and be updated. Some highlights since the last newsletter include: LAT GRBanalysis (new); User and group disk space; Using the SLAC batch farm; pylikelihood analysis (updated); Science Tools environment setup (update, including new SCons section); new astroserver examples; ASP Data Viewer help (updated). A View a full chronicle of the updates can be viewed here, http://glast-ground.slac.stanford.edu/workbook/pages/changelog/changeLog.htm^{Image Removed}, or, better yet, just browse through the Workbook - http://glast-ground.slac.stanford.edu/workbook/^{Image Removed}

Possible topics for this newsletter...

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