r4 - 21 Aug 2011 - 18:44:47 - RichardMountYou are here: TWiki >  AtlasSoftware Web > Minutes15Jul2011

Minutes15Jul2011 RAC Minutes, July 15, 2011


Members (*=present, #=apologies)

*Richard Mount, Jim Cochran (Analysis Support Group Chair), Alexei Klimentov (ATLAS ADC), Ian Hinchliffe (Physics Advisor), Rik Yoshida (Analysis Support Group Deputy), *Michael Ernst (U.S. Facilities Manager), #Rob Gardner (Integration Coordinator), *Kaushik De, (U.S. Operations Manager), Armen Vartapetian (U.S. Operations Deputy)

Ex-Officio: Torre Wenaus, Stephane Willocq, Mike Tuts, Howard Gordon

Approval or Correction of Minutes

Skipped because of the small attendance at this meeting.

Operations Report (Kaushik)

Simulation production is successfully saturating all the T1 and T2 resources that are not being used by analysis. Analysis usage is gradually increasing, but is still only 20%-25% at most.

The SUSY additional production approved at the May 27 meeting had resulted in about 3500 tasks that were about 50% complete. The SUSY production priority was being adjusted manually so that the production would complete within a few weeks even in the presence of the official simulation campaign.

LocalGroupDisk (Michael)

Usage of LocalGroupDisk was increasing. At present there were no resource limit issues, but at most sites the usage was about 70TB and much higher at BNL. Hiro has a web page http://www.usatlas.bnl.gov/dq2/monitor/findLocalgroupUsage that shows the overall usage of LocalGroupDisk in the US. Michael agreed to talk to the largest individual user of LocalGroupDisk and reported (after the meeting) that it was being used by the BNL group to support their group analysis interests, and was thus typical of the activities for which LocalGroupDisk was intended to be used.

LocalGroupDisk usage could continue to expand as long as it remained within the envelope of the total unpledged disk space at the T1 and T2s. It might be unwise to allow it to expand into unused pledge resources, because there was no easy mechanism to recover this space when it was needed. More monitoring tools and a prioritization process would be needed by the time LocalGroupDisk reached the total unpledged space.

Use of US ATLAS Resources by Others

Richard reported on a recent discussion at SLAC where the EXO (Enriched Xenon Observatory) group was looking to borrow significant CPU power for a week or so. The group had no CPU's to offer in trade, but it was normal SLAC practice to support such requests using CPU resources owned by the SLAC HEP program (BaBar and FGST). Although the SLAC T2 resources were part of the sharable batch farm, and welcomed opportunisitic use of unused resources, the T2 never allowed its LSF FairShare to be donated on the grounds that this would violate the MOU with US ATLAS. This position was understood and respected at SLAC.

Kaushik noted that an analogous issued had arisen at the SWT2 and that he had taken the same approach - only opportunistic access by non-ATLAS groups to the ATLAS resources.

During the discussion at SLAC, Richard had pointed out that US ATLAS was keen to open up opportunistic use of its resources to a finite number of OSG VOs. Norman Graf had asked if the ILC VO could be one of these and had been encouraged to contact Rob. The ILC usage would lead up to a major production in the spring of 2012.

AOB

None

Action Items

  1. 5/6/2011: Richard: Draft a web page explaining how users should exploit the various SpaceTokens - Ongoing.
  2. 3/25/2011: Richard: Email US ATLAS about the availability of production and analysis resources; ask Jim/Ric why there is so little analysis activity - Done.
  3. 9/24/2020: Kaushik: Organize the nature and timing of the effort to create an automated mechanism to give US-requested additional production priority access to US non-pledged resources. On hold - manual system works just fine for now

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