LHCb Core Software Meeting

Date and Location

10:30 - 11:30
CERN (2-R-030)


Ben Couturier, Gerhard Raven, Illya Shapoval, Joel Closier, Liang Sun, Marco Cattaneo, Marco Clemencic (minutes), Victoria Santiago



Discussion on Backward Incompatible Changes

Marco Ca. raised the issue of backward incompatible changes, and what should be LHCb policy. In particular, how should we address code breaking changes in the new Gaudi development model.

What was clear from the discussion is that we should allow backward incompatibilities if needed to improve the code base. Of course those changes should be agreed by all (or most of) Gaudi managers.

If the adoption from the various experiments cannot be synchronized, we can use the major version number to highlight backward incompatibilities, and use branches on old major versions.

Round Table

Marco Cl.

  • Prepared a few slides for the Gaudi Developers' Meeting this afternoon (attached to the agenda)
  • Nightly Builds
    • Completed a description of the Nightly Build System: LHCbNightliesImplementation
    • Started a troubleshooting page for shifters: LHCbNightliesTroubleshooting

Joel: we need to review the TWiki pages to be more easily reachable.
Marco Cl.: will update the old LHCbNightlies page once the new ones are completed.
Ben: will go through the ProjectRelease page and review it.

Marco Ca.

  • Data taking started for real
  • Agreed at the PAC to have a new stack as soon as possible with ROOT 6.04


  • New SLC5 build machine (to be tested)
  • Fixing the installation of the Coverity build machine
  • Started integration of LHCbDirac & c. with lb-run


  • Discovered a new experimental service at CERN: http://collspotting.cern.ch
    • the idea is to use a graph to correlate publications
    • they have a nice web-based graph viewer that can be useful for Ariadne


  • No problems reported since the release of LbScripts
  • CondDB deployment to CVMFS working fine
  • Memory monitoring with Jemalloc proved to be very effective


  • A couple of SIMCOND/DDDB global tags

Marco Cl. showed some concern about the how global tags are currently requested.
It was agreed that we can keep track of the global tag requests, may be through JIRA.


  • Following ATLAS Future Frameworks Workshop

-- MarcoClemencic - 2015-07-08

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