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status: In Progress
last update: 16 19 August 2010

This page is a record of the configuration for the P120 reprocessing project, event reclassification using Pass 7.3. This project involves reprocessing with Pass7 classification trees and (ultimately) new IRFs. The name "P120" derives from the word "processing" and the initial file version to be used for the output data products, e.g., r0123456789_v120_merit.root.

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P120-MERIT

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P120-MERIT P120-MERIT

Status chronology

• 8/19/2020 - 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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Task Location	/nfs/farm/g/glast/u38/Reprocess-tasks/P120-MERIT
Task Status	http://glast-ground.slac.stanford.edu/Pipeline-II/index.jsp
GlastRelease	v17r35p8 v17r35p10
Input Data Selection	"standard" from https://confluence.slac.stanford.edu/display/SCIGRPS/LAT+Dataset+Definitions along with "&& (RunQuality != "Bad" || is_null ( RunQuality )"
s/c data	FT2 from P105 (runs 239557414 - 271844560), then from current Level 1 production
Input Run List	ftp://ftp-glast.slac.stanford.edu/glast.u38/Reprocess-tasks/P120-MERIT/config/runFile.txt
photonFilter	CTBParticleType==0 && CTBClassLevel>0
electronFilter	CTBParticleType==1
jobOpts	ftp://ftp-glast.slac.stanford.edu/glast.u38/Reprocess-tasks/P120-MERIT/config/reClassify.txt
Output Data Products	MERIT, FILTEREDMERIT, ELECTRONMERIT

Timing and Scaling

• (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)

• (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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Introduce new trickleStreams.py script to (partially) assess pipeline activity and only the number of jobs considered appropriate based on available data.
(block 1)

maxProcessClumps = 600     ## prevent overload of xroot
maxMergeClumps = 20        ## prevent overload of xroot (inactive)
maxStreamsPerCycle = 20    ## prevent overload of /u30 on startup
timePerCycle = 900         ## 15 minutes:  allow time for dust to settle

With these parameters, it took ~ 5 hours to reach a point where fewer than 20 jobs per cycle were regularly submitted. Another 4.5 hours for the task to complete. On average, one run generated 7.5 processClump batch jobs.

For subsequent data (beyond block 2), xroot displayed such stress, that the maxProcessClumps limit was reduced to 250 or 300.

P120-FT1

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P120-FT1 P120-FT1

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