CoreSoftwareMeetingMinutes20100127 < LHCb

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---+!! LHCb Core Software Meeting
---++!! Date and Location

[[http://indicobeta.cern.ch/conferenceDisplay.py?confId=82575][27-Jan-2010]]%BR% 10:30 - 11:30 %BR% CERN (2-R-030) %BR%
---++!! Attendees
Hubert, Illya, Joel, Karol, Marco Ca., Marco Cl. (minutes), Markus, Rob 

---++!! Subjects
%TOC%

---+ News
   * From the Architects Forum
      * Finalization of the builds of the externals for MacOSX 10.6 (Snow Leopard)
      * LLVM 2.6 (gcc frontend), gcc 4.5-snapshot installed for testing
      * New version of gccxml supporting gcc-4.4
      * CMS suggested to test new Boost (>= 1.41), with fixes for the warnings

---+ Round Table
---++ Marco Cl.
   * [[http://proj-gaudi.web.cern.ch/proj-gaudi/releases/v21r7/][Gaudi v21r7]] released
   * Modified the instruction on the page [[AddProject]] to use Subversion
      * Marco Ca.: the [[CreateNewPackage]] page should be removed and only [[CreateNewPackageSVN]] should be advertised
   * Added the script =tag_package= to LbScripts
      * equivalent to "cvs rtag", can only tag the "head" version, with a valid version number that must be the same as the one specified in the requirements

---++ Karol
   * Trying to improve performances with the gcc builtin function [[http://gcc.gnu.org/onlinedocs/gcc-4.3.2/gcc/Other-Builtins.html#index-g_t_005f_005fbuiltin_005fexpect-2758][__builtin_expect]]
      * instructs the compiler about the value we expect for the condition in a branch (=if=) and improved of about 5% the CPU time of a small function when used for the standard pattern =if(msgLevel(MSG::DEBUG))=%BR%
         Marco Cl. suggests to add a macro called =OnMsgLevel(lvl)= in =GaudiCommon.h= that expands to =if(__builtin_expect(msgLevel(lvl),0))=. It will allow portability (Windows, ICC) and can be seen as a way of simplifying the usage of the common pattern. (A better implementation is possible if we use C++0x new features)%BR%
         Karol is testing it in Brunel.
      * It is also possible to provide macros like =LIKELY= or =UNLIKELY= (used in Linux kernel) to help in adopting the branch prediction hints

---++ Joel
   * Prepared (with the help of Marco Cl.) the CMT projects =Dirac= and =LHCbDirac=
      * a pre-release is available for Ganga to test
      * the new version should be deployed after the software week (to be synchronized with Ganga developers)
   * When we deploy a broken tarball on the grid, we must make a new (patch) release because we do not have a way to guarantee that the new version of the tarball has been correctly deployed everywhere.%BR%
      Markus suggests that we compare the MD5 sum of the installed tarballs with those on the web server before running a job. Can be implemented, but for the time being we have to make new releases.

---++ Hubert
   * LbScripts v5r0 ready for production
      * fixed several glitches
      * includes the script =tag_package=
   * Modified the task page of the [[https://savannah.cern.ch/projects/lhcbdeployment/][LHCb Deployment savannah]]
      * removed =dbg= and added the deployment strategy (Online, Grid)

---++ Rob
   * Problem with [[https://savannah.cern.ch/task/?13550#comment1][Rec v8r0 on Windows]]
      * rebuild only the Windows tarball

---++ Marco Ca.
   * Problem with some code that relies on the MagneticFieldSvc being registered to the UpdateManagerSvc (see [[https://groups.cern.ch/group/lhcb-project-trackingsoft/Lists/Archive/Flat.aspx?RootFolder=%2fgroup%2flhcb%2dproject%2dtrackingsoft%2fLists%2fArchive%2fb5ade5bd%2dfd53%2d40a6%2da230%2dcefd49df58fa&FolderCTID=0x012002002317E2B5AC9D4E42B76FC0A503E86F7F][discussion]]).
      * Marco Cl. says that it is possible to be registered to the UpdateManagerSvc even without a requested condition (replied to the thread).

---++ Illya
   * Implementing a data type field for the tags in the Conditions Database release notes (could be used fro the "HLT" type of tags)
      * What do we do with SIMCOND? The SIMCOND tag should always be specified explicitly. We can use the data type field for bookkeeping anyway.

---++ Markus
   * Online v4r36 released
      * Basic tests done

Hubert: needed to fix the Doxygen configuration files because they where relying on LHCb.

Marco Ca.: Is the overlap with LHCb satisfactory? Shell we remove ODIN?%BR%
The possibility of removing ODIN is being tested (mainly to get rid of GaudiObjDesc).

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-- Main.MarcoClemencic - 27-Jan-2010

Topic revision: r1 - 2010-01-27 - MarcoClemencic

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