LHCb Core Software Meeting

Date and Location

10:30 - HH:MM
CERN (2-R-030)


Ben Couturier, Gloria Corti, Joel Closier, Marco Cattaneo, Marco Clemencic (minutes), Markus Frank, Thomas Hartmann (Vidyo)



Round Table

Marco Cl.

  • Reported ROOT bug #94227: was causing the failure in Erasmus reported by Thomas last week
    • the fix caused other failures in Erasmus, which have been fixed
  • A problem in VeloDDDB has been found after a report on a mailing list. Patched version already released.
  • Problem with jobs failing on old versions of ONLINE CondDB partition.
    • the failure was due to the fact that the working directory of the pilot job was used to run a prompt reconstruction (downloading ONLINE) on one day, then it was re-used two days later to run a normal reconstruction (no update), which picked up the old ONLINE snapshot already there.
    • there are 3 possible solutions:
      • require "use SQLDDDB" in every job, but we do not need/want it
      • remove "use SQLDDDB" from every job, but we have problems with the prompt reconstruction
      • purge the local MYSITEROOT between two jobs in the pilot, but it's more complicated
    • once we have the new CVMFS volume for CondDB, we can have a more frequent refresh, so we can get rid of "use SQLDDDB"


  • Problem with a release of Erasmus, because of mkproject did not report the failure.
    • it is not clear why mkproject does not behave, because the code seems correct
  • New version of LbScripts, because there are 2 new packages that can be released/installed
    • install_project uses a dynamic list, so it is not a problem to add packages, but other tools use an hard-coded one, and they need to be fixed
  • Progress in changing the default CMTCONFIG
    • the default comes from a prioritized list in Platforms.py, but a change there means a change for everybody
    • to test at CERN, we can modify the CERN group login (ugly, but easy)
    • we cannot change yet the default, because Ganga does not work with gcc 4.6
  • Investigating the performances of Brunel, discovered a ~5% fluctuation in the CPU time used (CPU ticks), while it should be more deterministic
    • a possible cause of this effect is differences in the access to the memory in different executions (because of cache misses)
    • will investigate further


  • Discovered (with Marco Cl.) the reason of segfaults in the generation of configurables in GaussRICH
    • service where retrieved in constructors, thus, after the splitting of GaudiSvc, invalidating iterators in genconf
    • GaussRICH has been fixed (to be validated by Sajan). Marco Cl. says he can had a proper error message in genconf, instead of the segfault.
  • There are still compilations problems with gcc 4.6

Marco Ca.

  • Hard limits on memory on grid sites have been hitting Stripping jobs, see bug #94439.
    • We need to think about possible improvements at the framework level.

-- MarcoClemencic - 09-May-2012

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Topic revision: r2 - 2012-05-09 - MarcoClemencic
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