Atlas:Analysis ST 2009

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29.01.09

FR Cloud ST (2009 plans)

GRIF : GRIFOPN test - 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
LAPP-CPPM : interrested by a stress test ~200-300 jobs 
LPSC : interrested by a stress test ~200-300 jobs  
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.