Atlas:Analysis ST 2009

29.01.09

FR Cloud ST (2009 plans)

• Weekly ST : 50 jobs per site - all sites involved
  • LPSC : included (tested during http://gangarobot.cern.ch/st/test_117/)
  • BEIJING : switch to SE dpm ccsrm.ihep.ac.cn (tested during test 117)

 test 117 has shown missmatch with VO_ATLAS_DEFAULT_SE: srm.ihep.ac.cn 
 should be OK now

• File access comparison : 209-01-29 16:00 UTC
  • http://gangarobot.cern.ch/st/test_124/ 50 jobs Posix I/O
  • http://gangarobot.cern.ch/st/test_125/ 50 jobs FileStager
• Optimization and Site Stress test: On demand and dedicated to sites which are interrested.

GRIF : GRIFOPN test (as soon as it is available) Total of 1000 jobs will
be distributed to ATLAS CEs with following DS available being accessed
from LAL, SACLAY and LPNHE
       - GRIF-SACLAY_MCDISK: 332
       - GRIF-LPNHE_MCDISK: 334
       - GRIF-LAL_MCDISK: 457
LPC : to be planned when new storage arrays installation and network  
      upgrade done
      DS available on IN2P3-LPC_MCDISK: 326
LAPP-CPPM : interrested by a stress test ~130 DS available there
TOKYO : Input DS available on TOKYO-LCG2_MCDISK: 1000

Input DS available

• Thanks to Stéphane, followong DS available at sites (27/01/09):

{'TOKYO-LCG2_MCDISK': 1038, 'IN2P3-LPC_MCDISK': 342,
'IN2P3-CPPM_MCDISK': 185, 'GRIF-SACLAY_MCDISK': 369,
'GRIF-LPNHE_MCDISK': 380, 'IN2P3-LAPP_MCDISK': 284,
'IN2P3-LPSC_MCDISK': 143, 'GRIF-LAL_MCDISK': 493,
'RO-02-NIPNE_MCDISK': 184, 'BEIJING-LCG2_MCDISK': 129,
'RO-07-NIPNE_MCDISK': 171}

File access modes used by Ganga Jobs

Currently if users are submitting Ganga jobs with the LCG backend, the posix I/O access is the default method to access files (j.inputdata.type='DQ2_LOCAL')

One of the alternative access mode used by ST tests is the FileStager mode, which copies the input files in a background thread of the athena event loop usinglcg-cp from the local SE to the worker node tmp area. (j.inputdata.type='FILE_STAGER') This mode still needs a bit of improvements to gain full stability, but as demonstrated good performance at some (but not all) sites. Two access modes may be used during ST tests.