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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,_July_23,_2019#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">GlueX Software Meeting, July 23, 2019, </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> Alexander Austregesilo, Mark Ito
(chair), Simon Taylor</li>
<li> <b> Undisclosed Location: </b> David Lawrence</li>
</ul>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/yy79_/">recording of
this meeting</a> on the BlueJeans site. Use your JLab
credentials to access it.
</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/2019-July/003705.html">Cache
disk outage on Aug. 8</a>. The outage is to bring up
a new Lustre system.
<ul>
<li> We discussed the problem with the current
write-through cache system with many small files,
none of them backed up to tape.</li>
</ul>
</li>
<li> <b>Launch News</b>. There is a new Monitoring
Launch 2019-01 ver05 in preparation </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 <a
href="https://halldweb.jlab.org/wiki/index.php/GlueX_Software_Meeting,_July_9,_2019#Minutes"
title="GlueX Software Meeting, July 9, 2019">the
minutes from July 9</a>. Preparations for the
GlueX-PANDA ML workshop are continuing. David is in
contact with Tobias Stockmanns on the agenda.
</p>
<h3><span class="mw-headline"
id="Dropping_RedHat_Enterprise_Linux_6_from_list_of_supported_distributions">Dropping
RedHat Enterprise Linux 6 from list of supported
distributions</span></h3>
<p>After the last maintenance period at JLab,
jlabl3.jlab.org transitioned to RHEL7 and we lost our
last publicly available RHEL6 system. Mark proposed that
we stop building on that distribution, effectively
stopping support. He listed use-cases that might suffer:
</p>
<ol>
<li> Users of the few nodes on the gluon cluster that
run RHEL6</li>
<li> Desktop users at the lab that have not transitioned
to RHEL7. Simon is not among them.</li>
<li> Users outside the lab that depend on builds as a
proof of continued viability on the distribution.</li>
</ol>
<p>Mark pooled those present at the meeting and no one
objected to dropping support. Mark will therefore
discontinue RHEL6 builds. Nightly builds on RHEL6 have
already stopped.
</p>
<p>We also thought that support of CentOS6 could also be
dropped. </p>
<h3><span class="mw-headline"
id="New_update_release.3F_AmpTools.3F_RCDB.3F">New
update release? AmpTools? RCDB?</span></h3>
<p>Alex explained that the latest pre-release of AmpTools
has a few new, useful features, including reduced memory
usage and faster execution time. Use of GPUs has also
improved. He has tested it and has not seen any
problems. He encouraged its inclusion in the next update
version set.
</p>
<p>He also mentioned that we need a new version of RCDB so
that a few new aliases, needed for processing DIRC and
PrimEx data, can be used. This should also be included
in a new version set.
</p>
<p>Mark agreed to roll out a new version set soon.
</p>
<h3><span class="mw-headline"
id="Proposal_for_analysis_launch_and_skimming">Proposal
for analysis launch and skimming</span></h3>
<p>We briefly discussed Matt Shepherd's recent <a
rel="nofollow" class="external text"
href="https://mailman.jlab.org/pipermail/halld-offline/2019-July/thread.html#3707">proposal
to produce "flattened" analysis trees</a> as part
Analysis Launches. There was some substantial discussion
on the offline list (threaded to the previous link). It
seems that there is agreement that smaller data sets
would be a good thing, but there is the possibility that
modest tightening of cuts at analysis time itself might
yield a large fraction of the possible gains. In
addition if fewer "extra" particles are considered,
kinematic fitting will go a lot faster (fewer combos to
fit).
</p>
<p>There will be more discussion of the idea at the
Production and Analysis Meeting.
</p>
<h3><span class="mw-headline"
id="Fall_2018_Reconstruction_Launch">Fall 2018
Reconstruction Launch</span></h3>
<p>Alex reported that he has tagged a version of the
software for use in processing Fall 2018 data that
differs from that used for Spring 2018 only by an update
to the TPOL plugin, so essentially the same software.
</p>
<p>David reported an outage at NERSC from July 26 through
30. The plan is to wait until after the outage before
starting the launch. In the mean time, test jobs will be
submitted to make sure we are ready.
</p>
<h3><span class="mw-headline"
id="Review_of_recent_issues_and_pull_requests">Review
of recent issues and pull requests</span></h3>
<p>Sean reported that there are some fundamental
structural issues with the analysis libraries that
contribute to the crashes when analyzing multi-run files
(<a rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/halld_recon/issues/111">halld_recon
Issue #111</a>). Mark Dalton ran into this problem
recently analyzing Jψ data. The recent fixes to how some
plugins are initialized addresses some problems, but not
all of them. This one will take some effort to
disentangle.
</p>
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