GlueX Offline Meeting, December 15, 2009

Minutes

   JLab: Craig Bookwalter, Mark Ito (chair), David Lawrence, Sascha Somov,
   Simon Taylor, Elliott Wolin, Beni Zihlmann

Review minutes from last meeting

   We reviewed the [32]minutes from last time. Elliott suggested that the
   coding conventions decision be announced on the offline email list.

Announcements

    1. The [34]subversion server replacement is underway. Changes should
       be transparent to users.
    2. David has ordered a new Mac Mini. It should arrive in a few weeks.
       It will be used to test builds of our software on Mac OS 10.6 (Snow
       Leopard). The total cost (including $300 for a three-year
       JLab-IT-Division-mandated care plan) was about $1000.


HDDS directory re-organization

   Mark described some of the details of the HDDS directory location
   change that we decided on at the [36]October 21 Offline Meeting. He has
   posted a [37]wiki page that describes how to convert to the new system.

New tracking/photon class organization

   Simon presented recent work that he and David have done to reorganize
   our high-level "particle" classes based on discussions we had at the
   [39]previous Offline Meeting. See [40]his slides for details. He
   presented:
     * Outline of the overall scheme
     * Reconstruction flow diagram for charged tracks
     * Reconstruction flow diagram for both charged and neutral particles
     * Changes to Event Viewer


Accessing the start counter geometry in reconstruction

   Craig asked the group for guidance on this issue. He is trying to
   determine a start time for the event based on hits in the start counter
   and needs to correlate hits with charged tracks and find the point
   where the track crosses the counter. He has been trying to use the
   utility for accessing the hdds xml information. It turns out that the
   start counter geometry, as implemented in HDDS, a bit on the
   complicated side. We agreed that Craig, for now, should devise an
   approximate geometry in order to proceed with his work, e. g., a simple
   barrel counter joined to a simple forward section. This topic will have
   to be revisited.

Quick-start software builds

   Mark presented a [43]wiki page that describes a simplified method for
   building the Hall D software, including the recent introduction of a
   separate HDDS directory. The method boils down to:
     * four environment variable definitions
     * five command-line commands (or one shell script invocation)

   to build the JANA, HDDS and GlueX-simulation-and-reconstruction source
   tree.

Items for future meetings

   We identified the following topics during the course of this meeting:
     * dependency generation in the make scheme
     * environment variable checking in the makefiles
     * track/detector matching


New Action Items

    1. Announce coding convention decision on the Offline mailing list.
     __________________________________________________________________

   recorded by Mark Ito

   Retrieved from
   "http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_Offline_Meeting%2C_December_15%2C_2009"

References

  32. http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_Offline_Meeting%2C_December_1%2C_2009#Minutes
  34. https://mailman.jlab.org/pipermail/halld-offline/2009-December/000123.html
  36. http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_Offline_Meeting%2C_October_21%2C_2009
  37. http://www.jlab.org/Hall-D/software/wiki/index.php/HOWTO_use_the_stand-alone_HDDS_system
  39. http://www.jlab.org/Hall-D/software/wiki/index.php/GlueX_Offline_Meeting%2C_December_1%2C_2009#Minutes
  40. http://halldweb1.jlab.org/talks/2009-12/tracking_reorg_121509.pdf
  43. http://www.jlab.org/Hall-D/software/wiki/index.php/Quick_Start_Guide_to_building_GlueX_Software