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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,_October_23,_2018#Minutes">here</a>
and below.</p>
<p> -- Mark</p>
<p>________________________________________</p>
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<h1 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">HDGeant4 Meeting, October 23, 2018, </span><span
class="mw-headline" id="Minutes">Minutes</span></h1>
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lang="en">
<p>Present:
</p>
<ul>
<li> <b> JLab: </b> Thomas Britton, Mark Ito (chair),
Simon Taylor, Beni Zihlmann</li>
<li> <b> W&M: </b> Justin Stevens</li>
<li> <b>UConn: </b> Richard Jones</li>
</ul>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/V4hE7/">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 went over <a
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_October_9,_2018#Minutes"
title="HDGeant4 Meeting, October 9, 2018">the minutes
from October 9</a>. Discussion is folded into the
comments on the appropriate issues below.
</p>
<h3><span class="mw-headline" id="Issues_on_GitHub">Issues
on GitHub</span></h3>
<p>We went through <a rel="nofollow" class="external
text"
href="https://github.com/JeffersonLab/HDGeant4/issues">the
open issues for HDGeant4 on the GitHub site</a>.
</p>
<ul>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/68">geant3
crash</a>. 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).</li>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/67">Photon
energy scale</a>. Sean reported a shift in
two-photon invariant mass from the nominal. Richard is
aware of the issue.</li>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/66">More
FDC issues?</a>.
<ul>
<li> 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.</li>
<li> Thomas will produce distributions of hit truth
times and compare them between HDG3 and 4 and post
them.</li>
</ul>
</li>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/65">DIRC
photon propagation time across boundaries</a>. This
is still an issue. Richard is aware of it.</li>
<li> <a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/HDGeant4/issues/60">many
overlaps in the GlueX geometry</a>. 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.</li>
</ul>
<h3><span class="mw-headline"
id="Container-intended_software_builds_and_Oasis">Container-intended
software builds and Oasis</span></h3>
<p>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.
</p>
<h3><span class="mw-headline"
id="Submit_node_MySQL_connection_problem">Submit node
MySQL connection problem</span></h3>
<p>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.
</p>
<h3><span class="mw-headline" id="Small_Files_and_the_OSG">Small
Files and the OSG</span></h3>
<p>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.
</p>
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<p><br>
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<pre class="moz-signature" cols="72">--
Mark Ito, <a class="moz-txt-link-abbreviated" href="mailto:marki@jlab.org">marki@jlab.org</a>, (757)269-5295
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