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<p>Folks,</p>
<p>Please find the minutes <a moz-do-not-send="true"
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_December_4,_2018#Minutes">here</a>
and below.</p>
<p> -- Mark</p>
<p>_________________</p>
<p>
</p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">HDGeant4 Meeting, December 4, 2018</span><span
class="mw-headline" id="Minutes">, Minutes</span></h2>
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lang="en">
<p>Present:
</p>
<ul>
<li> <b> FSU: </b> Sean Dobbs</li>
<li> <b> JLab: </b> Alex Austregesilo, Thomas Britton,
Nacer Hamdi, Mark Ito (chair), Simon Taylor, Beni
Zihlmann</li>
<li> <b> UConn: </b> Richard Jones</li>
<li> <b> W&M: </b> Justin Stevens</li>
</ul>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/cheXd/">recording of
this meeting</a> on the BlueJeans site. Use your JLab
credentials.
</p>
<h3><span class="mw-headline"
id="Review_of_minutes_from_last_time">Review of
minutes from last time</span></h3>
<p>We looked over <a
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_October_23,_2018#Minutes"
title="HDGeant4 Meeting, October 23, 2018">the minutes
from October 23</a>.
</p>
<ul>
<li> Beni's issue with hdgeant3 crashes is still out
there.</li>
<li> Thomas re-iterated his offer to produce truth time
distribution relevant to the <a rel="nofollow"
class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/66">FDC
issue</a>.</li>
<li> Mark has not made progress on augmented Oasis
distributions suitable for development.</li>
<li> 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.</li>
</ul>
<h3><span class="mw-headline" id="Issues_on_GitHub_.3D">Issues
on GitHub =</span></h3>
<p>We went over the <a rel="nofollow" class="external
text"
href="https://github.com/JeffersonLab/HDGeant4/issues?q=is%3Aissue">list
of issues on GitHub</a>. We skipped over those for
which significant progress has not been made.
</p>
<h4><span class="mw-headline"
id="DIRC_photon_propagation_time_across_boundaries">DIRC
photon propagation time across boundaries</span></h4>
<p>Justin originally submitted <a rel="nofollow"
class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/65">this
issue</a>. 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 <a rel="nofollow"
class="external text"
href="https://github.com/JeffersonLab/HDGeant4/pull/72">his
pull request #72</a>. The bug fix has been submitted
to the Geant4 collaboration and should appear in future
releases.
</p>
<h4><span class="mw-headline"
id="New_Issue:_Merging_in_the_DIRC.2C_Software-Wise">New
Issue: Merging in the DIRC, Software-Wise</span></h4>
<p>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.
</p>
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