[Halld-offline] HDGeant4 Meeting Minutes, October 23, 2018

[Mark Ito]

Folks,

Please find the minutes here 
<https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_October_23,_2018#Minutes> 
and below.

   -- Mark

________________________________________


  HDGeant4 Meeting, October 23, 2018, Minutes

Present:

  * *JLab: * Thomas Britton, Mark Ito (chair), Simon Taylor, Beni Zihlmann
  * *W&M: * Justin Stevens
  * *UConn: * Richard Jones

There is a recording of this meeting <https://bluejeans.com/s/V4hE7/> on 
the BlueJeans site. Use your JLab credentials.


      Review of minutes from last time

We went over the minutes from October 9 
<https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_October_9,_2018#Minutes>. 
Discussion is folded into the comments on the appropriate issues below.


      Issues on GitHub

We went through the open issues for HDGeant4 on the GitHub site 
<https://github.com/JeffersonLab/HDGeant4/issues>.

  * geant3 crash <https://github.com/JeffersonLab/HDGeant4/issues/68>.
    Beni reported this one. Thomas has not been able to reproduce the
    problem, though he (Thomas) may be using a different version of
    HDDS. We agreed to close this one and allow Beni and Thomas to
    investigate off-issue (so to speak).
  * Photon energy scale
    <https://github.com/JeffersonLab/HDGeant4/issues/67>. Sean reported
    a shift in two-photon invariant mass from the nominal. Richard is
    aware of the issue.
  * More FDC issues? <https://github.com/JeffersonLab/HDGeant4/issues/66>.
      o Beni reminded us that he sees a loss in hits-along-the-track at
        the wire based stage and he suspects that the loss is in both
        HDG3 and HDG4.
      o Thomas will produce distributions of hit truth times and compare
        them between HDG3 and 4 and post them.
  * DIRC photon propagation time across boundaries
    <https://github.com/JeffersonLab/HDGeant4/issues/65>. This is still
    an issue. Richard is aware of it.
  * many overlaps in the GlueX geometry
    <https://github.com/JeffersonLab/HDGeant4/issues/60>. Still an
    issue. Richard warned that there are a lot of false positives in the
    overlap report from Geant4. He likened finding real problems to the
    proverbial search for a needle in a haystack. It is on his list.


      Container-intended software builds and Oasis

Richard pointed out the the GlueX software distribution in Oasis is 
insufficient to support builds. Mark acknowledged that only files needed 
to run is provided. Mark will look at augmenting the distributed files, 
at least for the most current release.


      Submit node MySQL connection problem

Thomas reported a problem on the OSG submit node, scosg16.jlab.org, that 
blocks connections from the submit node to our database server, 
hallddb.jlab.org. All connections to all databases are refused when the 
system in the error state, but only those from scosg16. Other nodes 
around that lab can connect; no problem. So far the error state has only 
been induced by running one of MCwrapper's Python scripts that monitors 
OSG job progress by updating a database. A CCPR has been submitted and 
several of the IT staff have had a look at the problem. They continue to 
work on it.


      Small Files and the OSG

Richard gave us a heads-up. At some point we will run into a "small file 
problem": repatriating multiple small files from disparate OSG nodes. We 
may need to design and implement a system-like solution.

Retrieved from 
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  * This page was last modified on 24 October 2018, at 13:00.


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

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