CvmfsTestsBNL

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CVMFS Tests setting at BNL

Shuwei Ye performed tests on aplay3 machine with an access to BNL CVMFS replica of ATLAS repository with all ATLAS software installed (in

/cvmfs/atlas.cern.ch/

The speed comparison was performed for standard ATLAS jobs using 16.0.2 release located on AFS, NFS, and CVMFS file systems at BNL. Each job ran twice to determine implications of caching in a local disk by CVMFS and AFS file systems. The tables below show the runtime measurements (with linux time command).

Runtime enviroment setup:

attempt	afs	cvmfs	nfs
1st	21.4s	7.11s	17.07s
2nd	9.05s	5.61s	6.40s

EventGeneration job (110 evts with Evgen_trf.py)

attempt	afs	cvmfs	nfs
1st	2m03	1m11	1m13
2nd	1m27	56.1s	1m21

Simulation job (3 evts with AtlasG4_trf.py)

attempt	afs	cvmfs	nfs
1st	28m15	27m53	27m47
2nd	27m56	27m39	27m49

Digitalization job (3 evts with Digi_trf.py)

attempt	afs	cvmfs	nfs
1st	4m22	3m07	3m30
2nd	4m22	3m04	3m41

Reconstruction job (3 evts with Reco_trf.py)

attempt	afs	cvmfs	nfs
1st	15m09	12m51	13m52
2nd	16m18	12m34	14m16

Interpretation

The results show that jobs run faster when the software is located on CVMFS. The acceleration depends on the job type. The largest speed-up was observed for the job Setup procedures (60% faster on CVMFS). There is no significant difference between the first and second run attempts.

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Major updates:
-- TWikiAdminGroup - 23 May 2012