WLCG Technical Forum


The WLCG Technical Forum has been set up for discussions between WLCG stakeholders about middleware etc. in view of improving the reliability and efficiency of the WLCG infrastructures.

It can and should play a role both in the resolution of short-term issues and in devising longer-term strategies for phasing out certain components in favor of better technologies. In the latter case it would be desirable to increase the commonality between the experiments, where that is practical. Industry or de-facto standards generally should be preferred over ad-hoc approaches.

Discussions are generally proposed on the mailing list (add cern.ch domain):

Only members can post, but anyone can apply for membership using the E-Groups interface. Subscribers outside CERN may need to apply first for an external account.

For any "promising" topic a (usually short-lived) working group would be formed by forum members who are interested and able to participate in creating a (short) working document with the topic's current state of affairs and recommendations. Such documents and associated discussion histories are hosted on a MediaWiki instance run by Andrew McNab at the University of Manchester:



  • Experiments
    • Various representatives per experiment
  • Sites
    • Tier-0
    • All Tier-1 centers
    • Significant number of Tier-2 sites with different setups
  • Infrastructures
  • Experts
    • Some resident, others consulted as needed

Discussion areas with examples

At the EGEE'09 conference a presentation was given about the Technical Forum with many examples of possible topics:


Data management

  • Efficient, scalable data access by jobs -- main STEP'09 outcome!
    • Local vs. remote
    • Protocols
    • Throttling
    • T3 farms vs. T2 load
  • ACLs
  • Quotas
  • SRM
  • Xrootd
  • GPFS, Lustre, NFSv4, Hadoop, REDDNet, ...
    • File protocol
    • Clouds
  • Issues specific to some implementation(s)
    • BeStMan, CASTOR, dCache, DPM, StoRM

Job management

  • WMS
  • ARC
  • Condor-G,-C, GT4
  • MyProxy failover
  • Pilot jobs
    • Glexec
    • Frameworks
  • Virtualization
  • Clouds
  • Shared SW area scalability
    • ALICE: BitTorrent


  • Vulnerabilities
  • Consistency

Information system

  • Fail-over
  • GLUE 2.0


  • All jobs
  • Consistency, consolidation


  • Messaging system
  • Storage

-- MaartenLitmaath - 2009-09-14

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Topic revision: r4 - 2009-11-09 - MaartenLitmaath
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