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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/GlueX_Software_Meeting,_September_1,_2020#Minutes">here</a>
and below.</p>
<p> -- Mark</p>
<p>
</p>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">GlueX Software Meeting, September 1, 2020, </span><span
class="mw-headline" id="Minutes">Minutes</span></h2>
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lang="en">
<p>Present: Alex Austregesilo, Edmundo Barriga, Thomas
Britton, Sean Dobbs, Mark Ito (chair), Igal Jaegle,
Naomi Jarvis, David Lawrence, Susan Schadmand, Simon
Taylor, Nilanga Wickramaarachchi, Beni Zihlmann
</p>
<p>There is <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/jx7T2hAh4Zm/">a
recording of his meeting</a> on the BlueJeans site.
Use your JLab credentials to authenticate.
</p>
<h3><span class="mw-headline" id="Announcements">Announcements</span></h3>
<ol>
<li> <a rel="nofollow" class="external text"
href="https://mailman.jlab.org/pipermail/halld-offline/2020-August/008300.html">New
release of Build Scripts: version 2.1</a>.
Introduces parallel building of xerces, lapack, and
hdgeant4.</li>
<li> <a rel="nofollow" class="external text"
href="https://mailman.jlab.org/pipermail/halld-offline/2020-August/008302.html">version.xml
files deleted from DIST</a>. Long threatened,
finally done.</li>
<li> <a rel="nofollow" class="external text"
href="https://mailman.jlab.org/pipermail/halld-offline/2020-August/008304.html">New
version set: 4.25.0</a>. Brings a new version of
halld_sim that includes changes for simulating the
hybrid FCAL and for the mc_gen event generator.</li>
<li> <a rel="nofollow" class="external text"
href="https://mailman.jlab.org/pipermail/halld-offline/2020-August/008308.html">New
version sets to address slow hdgeant4 jobs</a>. This
change looks not to address the problem advertised,
but neither does it do any harm.</li>
<li> <a rel="nofollow" class="external text"
href="https://mailman.jlab.org/pipermail/halld-offline/2020-August/008310.html">New
version set: version_4.27.0.xml</a>. Brings in a new
version of JANA.</li>
<li> Simon reports that the work disk is full. Please
delete any unneeded files under /work/halld.
Individual user usage can be found on <a
rel="nofollow" class="external text"
href="https://scicomp.jlab.org/scicomp/#/work">this
SciComp page</a>.</li>
<li> Alex reported on a problem with large number of NIS
lookups from DSelector jobs on the farm. The problem
seems to be associated with CCDB access from the ROOT
program used. This could be addressed in at least two
ways:
<ol>
<li> Writing a ROOT-based interface for PROOF Lite
jobs so that each thread need not do a separate
access to the CCDB.</li>
<li> Have a way that the start of jobs could be
automatically staggered in time so the initial
demand for database access does not all come at
once.</li>
</ol>
</li>
</ol>
<h3><span class="mw-headline"
id="Review_of_Minutes_from_the_Last_Software_Meeting">Review
of Minutes from the Last Software Meeting</span></h3>
<p>We went over [[GlueX Software Meeting, August 18,
2020#Minutes|minutes from the meeting on August 18.
</p>
<ul>
<li> <b>Overleaf</b>. David reported that that Lab now
has a limited number of licenses under the control of
various administrative assistants around the Lab. If
folks have a document that they want to have under the
license, they should contact one of the license
holders and the document can be registered. This is a
temporary situation until the magnitude of the need is
demonstrated. Naomi has given all of her documents to
Rachel Harris. David said that he would talk to Brad
Sawatzky to see if more instruction should be given
the AAs to make their role more effective.
<ul>
<li> Susan mentioned that a group at Juelich had
forked a free version of a predecessor of
Overleaf, and stood up their own system. That
might be an alternate path for us.</li>
</ul>
</li>
<li> <b>Tests of Pull Request Builds</b>. Sean reported
that tests for HDGeant4 pull requests have been
implemented now.</li>
</ul>
<h3><span class="mw-headline"
id="Report_from_the_Last_HDGeant4_Meeting">Report from
the Last HDGeant4 Meeting</span></h3>
<p>We went over <a
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_August_25,_2020#Minutes"
title="HDGeant4 Meeting, August 25, 2020">the minutes
from the meeting on August 25</a> without significant
comment.
</p>
<h3><span class="mw-headline"
id="New_Project_to_Calibrate_Drift_Chambers_with_AI">New
Project to Calibrate Drift Chambers with AI</span></h3>
<p>David announced that he, Naomi, and Thomas were awarded
a grant to use machine learning to regulate drift
chamber gains constants automatically. The idea is that
the system can be trained to adjust the high voltage on
the chambers in response to the atmospheric pressure
such that gains are kept constant. The funding lasts for
three years. They will be hiring two postdocs to work on
the project.
</p>
<h3><span class="mw-headline"
id="Review_of_recent_discussion_on_the_GlueX_Software_Help_List">Review
of recent discussion on the GlueX Software Help List</span></h3>
<p>Nilanga brought our attention to <a rel="nofollow"
class="external text"
href="https://groups.google.com/g/gluex-software/c/ONrzx_Y7B8U">a
post from Kevin Luckas</a> asking about doing
kinematic fits to veto specific background reactions. In
the thread Justin pointed out the work that Alex Barnes
had done on this. Nilanga was getting crashes trying to
use the code and is making an appeal to any experts out
there for help in figuring out what is going wrong.
</p>
<h3><span class="mw-headline" id="Action_Item_Review">Action
Item Review</span></h3>
<ol>
<li> Ask the Computer Center about staging the start of
jobs in time.</li>
<li> Make sure that the automatic tests of HDGeant4 pull
requests have been fully implemented.</li>
</ol>
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