[Halld-offline] Minutes, GlueX Offline Meeting, Oct. 19, '10

[Mark M. Ito]

  Find the minutes of the October 19, 2010 GlueX Offline meeting posted 
at 
http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_Offline_Meeting%2C_October_19%2C_2010#Minutes 
and as text below.

GlueX Offline Meeting, October 19, 2010
Minutes

    JLab: Craig Bookwalter, Hovanes Egiyan, Mark Ito (chair), Lubomir
    Pentchev, Dmitry Romanov, Simon Taylor, Elliott Wolin, Beni Zihlmann

Announcements

     1. [27]sim-recon-2010-10-11 was recently released.
     2. OSG client tools. Working with Bob Lukens of CNI, Richard can now
        successfully run the client tools at the lab. The last bit was to
        get the necessary ports open through firewall.
     3. Changes to CDC/FDC hit container classes. Beni pointed out that his
        recent changes to correlate hits with the particles that produced
        them needs to be reflected in the DANA-EVIO interface routines.
        Elliott will work on that. Beni agreed to give a talk on these
        changes at a future meeting.
     4. Online code in Subversion repository. Elliott mentioned that
        online-related code will start needing version control soon. We
        decided that there was no need to start a separate Subversion
        repository for this. We also discussed where the new code should
        go; there are many acceptable choices here.


Calibration Database Update

    Dmitry gave us a very quick update on progress. The basic C++ objects
    for the support library are done. He is now working on integration into
    JANA and the command-line interface.

EVE: an event display environment

    Dmitry gave us an overview of [30]EVE, the Event Visualization
    Environment of ROOT. He has some experience using it for the SELEX
    experiment at Fermilab. See [31]his slides for details. Some points
    from his talk:
      * It's history goes back to 2005, with the API reaching maturity in
        2008. Development continues.
      * It is used by CMS, ALICE, and several other experiments.
      * It provides a framework for the user's geometry and event data and
        is built on top of ROOT.
      * It has a set of standard classes for dealing with detector
        geometry, hits, and particle tracks.
      * Geometry is fundamentally three dimensional, but there are
        facilities for doing two dimensional projections, using both
        pre-defined and user-defined, custom algorithms.
      * There are facilities for grouping individual hits for display
        purposes, as well as generating statistical quantities for the
        groups.
      * Hooks exist to backtrace reconstructed objects to generated
        particles.
      * There are several EVE tutorial examples in the standard ROOT
        distribution.

    This system looks like an attractive option for GlueX. Beni pointed out
    that we already have a set of JAVA geometry objects for the detector
    that are generated from the HDDS files. On the other hand work has
    already started on a JAVA-based approach. Dmitry is interested on
    working on this as a background project and plans to give another
    report at a future meeting. We are especially interested in assessing
    how hard it is to implement and maintain a working system in this
    framework.

Action Item Reveiw

    We went over them. Not a lot of movement from last time. Exhortations
    were given.

New Action Items

     1. Schedule Beni for a talk on hit/particle correlation information.
        -> Beni

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References

   27. 
http://www.jlab.org/Hall-D/software/wiki/index.php/Sim-Recon_Tagged_Releases
   30. http://www.citeulike.org/user/Scis0000002/article/7423564
   31. https://halldweb1.jlab.org/talks/2010-10/eve_and_db_10-19-2010.pptx