Speaker
G. Shabratova
(Joint Institute for Nuclear Research (JINR))
Description
The report presents an analysis of the Alice Data Challenge 2004.
This Data Challenge has been performed on two different distributed
computing environments. The first one is the Alice Environment for
distributed computing (AliEn) used standalone. Presently this
environment allows ALICE physicists to obtain results on simulation,
reconstruction and analysis of data in ESD format for AA and pp
collisions at LHC energies. The second environment is the LCG-2
middleware accessed via AliEn with the help of an interface,
developed at INFN. Three Russian sites have been configured as AliEn
nodes for the Data Challenge. These sites (IHEP at Protvino, ITEP in
Moscow and JINR at Dubna) could run a maximal of 86 jobs. The initial
analysis shows that the architecture of one site was not adequate for
distributed computing. Another farm had nodes with insufficient RAM
for efficient job processing. All these problems have been cured
subsequent DC phases.
Actions have also been taken to reduce the downtime due to wrong site
configuration. The local AliEn server installed at the JINR site has
been used as a standard configuration for the other Russian sites.
The total number of jobs processed in Russia constitute ~2% of total
run in the ALICE DC 2004.
Primary authors
A. Selivanov
(ITEP, Moscow)
A. Zarochencev
(SPbSU)
E. Ryabinkin
(KIAE, Moscow)
G. Shabratova
(Joint Institute for Nuclear Research (JINR))
V. Dobretsov
(KIAE, Moscow)
V. Kolosov
(ITEP)
V. Korenkov
(Joint Institute for Nuclear Research (JINR))
V. Mitcin
(Joint Institute for Nuclear Research (JINR))
V. Zolotarev
(SPbSU)
Y. Bugaenko
(Joint Institute for Nuclear Research (JINR))
Y. Kharlov
(State Res.Center of Russian Feder. HEP Inst (IFVE))
Y. Lyublev
(Institute for Theoretical and Experimental Physics (ITEP))
