[Halld-offline] HDGeant4 Meeting Minutes, December 4, 2018

[Mark Ito]

Folks,

Please find the minutes here 
<https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_December_4,_2018#Minutes> 
and below.

   -- Mark

_________________


    HDGeant4 Meeting, December 4, 2018, Minutes

Present:

  * *FSU: * Sean Dobbs
  * *JLab: * Alex Austregesilo, Thomas Britton, Nacer Hamdi, Mark Ito
    (chair), Simon Taylor, Beni Zihlmann
  * *UConn: * Richard Jones
  * *W&M: * Justin Stevens

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


      Review of minutes from last time

We looked over the minutes from October 23 
<https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_October_23,_2018#Minutes>. 


  * Beni's issue with hdgeant3 crashes is still out there.
  * Thomas re-iterated his offer to produce truth time distribution
    relevant to the FDC issue
    <https://github.com/JeffersonLab/HDGeant4/issues/66>.
  * Mark has not made progress on augmented Oasis distributions suitable
    for development.
  * Thomas reported that the problem he was seeing with blocked database
    server access from the OSG submit host (scosg16.jlab.org) was due to
    an overloaded network interface card (NIC) on the submit host. The
    load comes when shipping random trigger files to multiple sites when
    jobs are freshly submitted. The NIC was only rated at 1 Gb/s. It has
    since been replaced with two "bridged" 10 Gb/s cards; problem fixed.
    There was a residual problem with Condor giving non-unique job ID
    numbers, but that was resolved with a reboot of the host.


      Issues on GitHub =

We went over the list of issues on GitHub 
<https://github.com/JeffersonLab/HDGeant4/issues?q=is%3Aissue>. We 
skipped over those for which significant progress has not been made.


        DIRC photon propagation time across boundaries

Justin originally submitted this issue 
<https://github.com/JeffersonLab/HDGeant4/issues/65>. Cerenkov photon 
propagation times from points very close to each other, but on opposite 
sides of a volume boundary, were separated by way more than they should 
be. Richard traced the problem to a bug in Geant4 having to do with how 
parallel worlds are treated. See further discussion in his pull request 
#72 <https://github.com/JeffersonLab/HDGeant4/pull/72>. The bug fix has 
been submitted to the Geant4 collaboration and should appear in future 
releases.


        New Issue: Merging in the DIRC, Software-Wise

Currently, to run the DIRC simulation and reconstruction, one must check 
out special versions of the code that resides on branches of four 
repositories: hdds, halld_recon, halld_sim, and hdgeant4. This was 
unavoidable given the nature of the changes. However, it presents a 
potential challenge when all of these changes are ready to merge onto 
their respective master branches. We need to look at the issue, see how 
much of a problem it really is, and make a plan. Mark agreed to open a 
new issue on this.

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  * This page was last modified on 6 December 2018, at 12:32.

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