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<p>Folks,</p>
<p>Please find the minutes below and at
<a class="moz-txt-link-freetext" href="https://halldweb.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_December_21,_2016#Minutes">https://halldweb.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_December_21,_2016#Minutes</a>
.</p>
<p> -- Mark</p>
<p>__________________________</p>
<p>
</p>
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<h1 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">GlueX Offline Meeting, December 21, 2016, </span><span
class="mw-headline" id="Minutes">Minutes</span></h1>
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<p>Present:
</p>
<ul>
<li> <b>CMU</b>: Naomi Jarvis, Curtis Meyer</li>
<li> <b>JLab</b>: Alexander Austregesilo, Thomas
Britton, Brad Cannon, Sean Dobbs, Sergey Furletov,
Mark Ito (chair), Mahmoud Kamel</li>
<li> <b>MIT</b>: Cristiano Fanelli</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/dnUl2/">recording of
this meeting</a> on the BlueJeans site.
</p>
<h3><span class="mw-headline" id="Announcements">Announcements</span></h3>
<ol>
<li> <b><a rel="nofollow" class="external text"
href="https://mailman.jlab.org/pipermail/jlab-scicomp-briefs/2016q4/000131.html">CentOS
7 upgrades; farm outages for relocation Dec 19-20</a></b>.
Conversion of farm nodes to CentOS7 continues. Monday
and Tuesday several nodes were physically relocated in
the Data Center.</li>
<li> <b><a rel="nofollow" class="external text"
href="https://mailman.jlab.org/pipermail/halld-offline/2016-December/002567.html">Problems
with reading recent data with many threads</a></b>.
This problem appears to be due to corruption in the
raw data. The cause is under investigation.</li>
</ol>
<h3><span class="mw-headline"
id="Review_of_minutes_from_the_last_meeting">Review of
minutes from the last meeting</span></h3>
<p>We went over the <a
href="https://halldweb.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_December_7,_2016#Minutes"
title="GlueX Offline Meeting, December 7, 2016">minutes
from December 7</a>.
</p>
<ul>
<li> We will have to have a discussion about whether
HDDS XML files will continue to be present in the Git
repository once they are served from the CCDB. If they
remain, it might be confusing, but it will be what we
are used to.</li>
<li> Sean pointed out that work with the new scheme for
access to HDDS information should be coordinated with
work on the new event viewer.</li>
</ul>
<h3><span class="mw-headline"
id="Report_from_the_JLab_Computing_Steering_Committee_Meeting">Report
from the JLab Computing Steering Committee Meeting</span></h3>
<p>Mark gave the report. This is a standing meeting which
is called every few months. It is the forum where IT
Division reports progress to all of the various
computing stakeholders around the lab. Mark flashed
slides from <a rel="nofollow" class="external text"
href="https://halldweb.jlab.org/talks_secure/2016/ITSC_Dec2016_CNI_V2.pdf">CNI</a>
and <a rel="nofollow" class="external text"
href="https://halldweb.jlab.org/talks_secure/2016/IT%20Steering%20Committee%20Dec%202016%20SciComp.pdf">SciComp</a>
to illustrate the scope of the subjects covered (slides
are password protected, username starts with "g", ends
in "x", password that of the our document portal thing).
</p>
<h3><span class="mw-headline" id="Launches">Launches</span></h3>
<p>Alex gave the report. He had remarks beyond those in <a
rel="nofollow" class="external text"
href="https://mailman.jlab.org/pipermail/halld-offline/2016-December/002570.html">his
email</a> from earlier in the week.
</p>
<ul>
<li> There has been a large reduction in the memory
needed to run the analysis launch since it got
started. There were several changes that Paul Mattione
made to the analysis libraries to do this. In the
beginning, jobs were run using only 18 threads of the
72 hyperthreads available on the farm nodes. Now all
72 can be used, although the job speed only increased
by a a factor of two. Now the jobs use 50 GB of the 64
GB available.</li>
<li> He would like to start the "real" monitoring launch
before the break. Sean mentioned that there are still
some calibrations that need to get finished before the
launch can start, namely timing in the tagger, PS, and
TOF.</li>
<li> The wiki page describing the second analysis launch
on the Spring data is in preparation. There are a lot
more channels to catalog this time. There was an
effort to eliminate plugins for channels that were
made redundant by the Mitchell Omni-plugin, but there
still may be some reduction possible.</li>
</ul>
<h3><span class="mw-headline" id="Sim_1.2">Sim 1.2</span></h3>
<p>Sean is almost ready with the necessary mcsmear
parameters. He is looking at the following systems:
</p>
<ul>
<li> Start Counter. He is looking at whether tracking
uncertainties are adding a significant amount to the
measured resolution. If so those effects should not be
attributed to the intrinsic start counter resolution.</li>
<li> FDC. He is tuning some of the thresholds being
applied for the FDC cathodes.</li>
<li> CDC. Some checks on the efficiency plug-in are
planned.</li>
</ul>
<p>We talked about generating electromagnetic background
for the simulated events. Right now this is dominating
the CPU time need. Sean has plans for overlaying the
hits from real data on the simulated hits.
</p>
<h3><span class="mw-headline" id="HDGeant4_Update">HDGeant4
Update</span></h3>
<p>Richard gave us a report.
</p>
<ul>
<li> He has added the geometry for the DIRC and the
triplet polarimeter and is working on hit generation
for the DIRC now.</li>
<li> The boost libraries are required to build HDGeant4.
These are available as optional packages in most Linux
distributions.</li>
<li> Event generation for triplet events will be done
inside of HDGeant4 itself and not in an external
generator program. If this functionality is required,
you need to build Richard's DiracXX package, available
from GitHub (it is one of his public repositories).</li>
<li> Mark and Nathan Sparks are working on automated
builds.</li>
<li> If folks find problems or have suggestions, they
should open an <a rel="nofollow" class="external
text"
href="https://github.com/rjones30/HDGeant4/issues">issue
on GitHub</a>.</li>
</ul>
<h3><span class="mw-headline"
id="Upcoming_OSG_Service_at_JLab">Upcoming OSG Service
at JLab</span></h3>
<p>Richard announced a new facility at JLab for job
submission to the Open Science Grid (OSG). There will be
a new box installed at the lab, spec'ed out by the OSG
folks, with the latest OSG software stack installed and
an robust network connection to the outside world. The
box will be administered by SciComp. Users can log in
with their CUE credentials. To submit jobs from the
GlueX Virtual Organization, one needs a personal OSG
credential, available through Richard. See [[Using the
Grid|his wiki page on OSG use] for instructions on how
to obtain one.
</p>
<p>This is a pilot project at present. If it proves to be
successful and easy to use it could give a big boost in
opportunistic computing power widely available to all
collaborators.
</p>
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