[Halld-offline] Offline Software Meeting Minutes, October 31, 2012

[Mark M. Ito]

Find the minutes below and at
https://halldweb1.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_October_31,_2012#Minutes

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GlueX Offline Meeting, October 31, 2012
Minutes

    Attendees:
      * CMU: Paul Mattione, Curtis Meyer
      * JLab: Mark Ito (chair), David Lawrence, Dmitry Romanov, Simon
        Taylor, Elliott Wolin

Announcements

      * There is a cron job creating SQLite versions of the CCDB nightly.
        Find them at JLab in /group/halld/Software/calib/ccdb_sqlite .
      * CentOS6 farm nodes removed from farm this week for a linpack test.
        The test should be over on Thursday.

Report from the last Data Challenge Meeting

    Mark created a [28]web-accessible directory for keeping track of data
    challenge conditions.

Anomalies in MC units

    Elliott reported seeing anomalous units in some fields in the raw data.
    Energies should be in GeV and time in nanoseconds and he is seeing
    other values. Also negative values of values are sometimes seen,
    presumably due to smearing.

    Work is continuing on code correctness and execution speed.

    Curtis suggested that events with electromagnetic background turned on
    be generated to measure event size.

hddm2root

    David described recent work on generating ROOT trees from
    HDDM-formaterd data. The idea is to do this automatcially from the
    information in the template included in every HDDM file, with no hand
    coding. See [29]his slides for details.

    There appears to be a limitation of two levels of nesting in the HDDM
    structure when conversion to ROOT is attempted. David will study this
    further.

Resources

    David discussed recent work implementing a system for getting files
    (mainly magnetic field maps) that are too large to be handles
    conveniently by a relational database system (although that is what the
    CCDB is doing now). Such files are typically called [30]resources. They
    tend not to change on a run-by-run basis, so caching them on a local
    disk is an efficient scheme. This is work in progress and we will get a
    report form David in the future when the package is ready.

Reconstruction sub-group reports

Calorimeters and Tracking

    While working on the FDC model in the simulation, Simon noticed some
    overlaps in the geometry, in particular an overlap between FDC cables
    and the BCAL and the newly added FDC survey monuments, again with the
    BCAL. Richard Jones noted some of these in a previous collaboration
    meeting. David has contacted Zizis and Elton on this and has identified
    the relevant drawings. A fix is on the way. In addition David noticed
    that an outer aluminum layer on the BCAL was never included; it will be
    added as well.

PID: Reorganized Offline HOWTO List

    Paul re-organized the wiki page for the [31]software HOWTOs putting
    them into sensible categories.

    Retrieved from
 
"https://halldweb1.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_October_31,_2012"

References

   28. 
https://halldweb1.jlab.org/data_challenge/01/conditions/data_challenge_1.html
   29. https://halldweb1.jlab.org/wiki/images/7/76/20121031_hddm2root.pdf
   30. https://halldweb1.jlab.org/talks/2011-4Q/ResourceManager.pptx
   31. https://halldweb1.jlab.org/wiki/index.php/Offline_HOWTO_List

-- 
Mark M. Ito
Jefferson Lab
marki at jlab.org
(757)269-5295