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P120-MERIT
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Status chronology
- 8/26/2010 - serious xroot problems. See initial distribution of files across xroot servers. From this report (courtesy Wilko) it is easy to see where problems are likely to arise - when the number of servers involved is small, e.g. two or three.
- 8/19/2010 19/2020 - production continues at a crawl due to xroot server difficulties
- 8/16/2010 - resume full production, but at a slow trickle (max 350 simultaneous processClump jobs)
- 8/8/2010 - block 2 reprocessing complete. Many xroot server problems. (5 days to process 2084 runs)
- 8/3/2010 - begin block 2 reprocessing (through 255132033 MET), bringing the total runs reprocessed to 2721, about 5-1/2 months of data.
- 7/28/2010 - block 1 re-reprocessing complete
- 7/27/2010 - New GlastRelease (v17r35p10) containing new evtUtils, "to make the FT1EventClass bits compatible with the ScienceTools". Cleanup, including removing all files created last week during the first attempt.
- 7/21/2010 - block 1 reprocessing complete
- 7/20/2010 - agree upon 'pilot block' of runs (239557417 - 243220241), 637 runs. Begin...
- 7/19/2010 - submit first test run. success. await feedback
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- (beyond block 2 results) Due to xroot problems (overstressing a small number of machines) the processing throughput dropped to 25-30 runs/hour (190-225 jobs/hour)
- Wilko begins redistributing files around the xroot system in order to balance the load. This is only partially done by task completion.
- (block 1 results) The processClump step is taking ~40 hequ-minutes (or ~65 fell-minutes). With >500 simultaneous jobs running, there is little noticeable strain on xroot. There are five servers in the yellow-orange load range and they are claiming ~110-130 MB/s I/O rate.
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