[Halld-offline] Software Meeting Minutes, November 13, 2018

[Mark Ito]

Folks,

Please find the minutes here 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Software_Meeting,_November_13,_2018#Minutes> 
and below.

   -- Mark

_________________


      Minutes, GlueX Software Meeting, November 13, 2018

Present:

  * *CMU: * Naomi Jarvis
  * *FSU: * Sean Dobbs
  * *JLab: * Alexander Austregesilo, Stuart Fegan, Colin Gleason, Mark
    Ito (chair), David Lawrence, Simon Taylor, Beni Zihlmann
  * *Regina: * Ahmed Foda
  * *W&M: * Justin Stevens

There is a recording of this meeting <https://bluejeans.com/s/Vd7ss/> on 
the BlueJeans site. Use your JLab credentials to access it.


      Announcements

 1. *scosg16 upgraded.* Thomas reported that the upgrade of the network
    card on scosg16.jlab.org solved the problem he has been fighting
    with slow job submission to the OSG and lost access to our database
    server. The card was upgraded from 1 Gbit/s to two bound 10 Gbit/s
    interfaces, a 20-fold increase in bandwidth. The problems, before
    changing the interface, was due to shipping random trigger files to
    the various OSG sites. Where it used to take 6 to 8 hours to submit
    2,500 jobs, it now takes 30 minutes.
 2. MCwrapper v2.0.3 released
    <https://github.com/JeffersonLab/gluex_MCwrapper/releases/tag/v2.0.3>.
    See the release notes for complete information. Thomas has
    implemented a reaction line composer to the MCwrapper submit page
    <https://halldweb.jlab.org/gluex_sim/SubmitSim.html>. DReactions
    that users specify will be produced as ROOT trees along with the
    output REST files.
 3. *Offline Monitoring Launch Job Crashes*. Alex A. reported that the
    last monitoring launch had only a 50% yield. He tried running the
    code used in last NERSC campaign with a nearly 100% success rate.
    There is a suspicion that a change introduced some weeks ago to
    remove spurious tracks might be the cause. Alex will experiment with
    a build that excludes that change to see if it makes a difference.
      * Simon noted that the root cause of the spurious tracks were
        candidates that changed sign after re-fits done during
        reconstruction. These in turn resulted in tracks that had two
        occurrences of a particular particle type (say π^− ) which in
        turn resulted in apparent "duplicate" combos.


      Review of minutes from the previous meeting

We went over the minutes from the October 30 meeting 
<https://halldweb.jlab.org/wiki/index.php/GlueX_Software_Meeting,_October_30,_2018#Minutes>. 


  * *Computing Review. * Curtis and David have posted draft slides to
    the Indico site <https://www.jlab.org/indico/event/294/>.
  * *NERSC. * David has received the green light for another monitoring
    launch at NERSC, using version 19. He ran into a SWIF2 problem that
    Chris Larrieu has addressed. The idea is to analyze all runs, using
    5% of the files for each.
  * *Work Packages. * No progress has been made assigning names to packages.


      Review of recent issues and pull requests


        halld_recon

  * Issue #40: Sean broke the tracking again...
    <https://github.com/JeffersonLab/halld_recon/issues/40> Problem seen
    with ρ yield. Sean traced it to accidental commenting out of a line
    of code. Not clear how it worked at all. Problem was really not with
    the ρ yield; rather the normalization against number of events.
  * Issue #39: Problems with kinematic fitter in Lambda events?
    <https://github.com/JeffersonLab/halld_recon/issues/39> There was a
    lot of discussion on this issue, but in summary:
      o Sean and Beni found NaNs in the fitting. These came from tracks
        coming from way upstream or from tracks with huge x and/or y
        starting coordinates. This problem did not dominate and are not
        related to the large deficits that Hao Li is reporting.
      o Alex's report of 50% of jobs crashing on an analysis launch with
        Hao's fix branch may be related to the crashes he reported
        earlier in the meeting when using the most recent code (see the
        announcements above). He will investigate.


        halld_sim

  * Issue #16: mcsmear crash
    <https://github.com/JeffersonLab/halld_sim/issues/16>. This sparked
    a discussion about RCDB support and responsibility for (a)
    maintaining the code (b) correct input of critical values during
    running. For (a) Dmitry Romanov is here now and we are hoping he
    will be able to devote significant time to RCDB and for (b) we
    should contact the online group to make sure all needed parameters
    are correctly added. [added in press: see Alex's comment on this
    issue about conversations with Sergey Furletov and Dmitry.]


        hdgeant4

There has been very little work in this area 
<https://github.com/JeffersonLab/hdgeant4/issues?utf8=%E2%9C%93&q=is%3Aissue> 
lately. Simon has started looking at the problem of FDC hits 
disappearing from tracks.

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  * This page was last modified on 14 November 2018, at 13:33.

-- 
Mark Ito, marki at jlab.org, (757)269-5295

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