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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_7,_2016#Minutes">https://halldweb.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_December_7,_2016#Minutes</a>
.</p>
<p> -- Mark<br>
</p>
______________________<br>
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<h2 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">GlueX Offline Meeting, December 7, 2016, </span><span
class="mw-headline" id="Minutes">Minutes</span></h2>
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<p>Present:
</p>
<ul>
<li> <b>CMU</b>: Curtis Meyer</li>
<li> <b>Glasgow</b>: Peter Pauli</li>
<li> <b>JLab</b>: Alexander Austregesilo, Thomas
Britton, Mark Ito (chair), Nacer Hamdi, Paul Letta,
Paul Mattione, Nathan Sparks, Simon Taylor, Beni
Zihlmann</li>
<li> <b>NU</b>: Sean Dobbs</li>
</ul>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/1ST@C/">recording of
this meeting</a> on the BlueJeans site.
</p>
<h3><span class="mw-headline" id="Announcements">Announcements</span></h3>
<ol>
<li> Mark called our attention to the <b>three releases
of sim-recon</b> since the last meeting a month ago:
<ul>
<li> <a rel="nofollow" class="external text"
href="https://mailman.jlab.org/pipermail/halld-offline/2016-November/002540.html">2.8.0</a>
(Mark)</li>
<li> <a rel="nofollow" class="external text"
href="https://mailman.jlab.org/pipermail/halld-offline/2016-November/002548.html">2.9.0</a></li>
<li> <a rel="nofollow" class="external text"
href="https://mailman.jlab.org/pipermail/halld-offline/2016-November/002550.html">2.10.0</a></li>
</ul>
</li>
<li> <a rel="nofollow" class="external text"
href="https://mailman.jlab.org/pipermail/halld-offline/2016-November/002542.html">Flash
250 Emulation</a>. Sean reminded us about improved
fidelity with the firmware and the new reporting of
errors from compression.</li>
<li> <a rel="nofollow" class="external text"
href="https://mailman.jlab.org/pipermail/halld-offline/2016-December/002556.html">mc_generic
CCDB variation</a>. Sean pointed the existence of
this new variation, intended to help users who don't
know or care about the details of the calibration
settings for simulated data, for example, those
starting to learn the system.</li>
<li> <b>Sim 1.2 test jobs running</b>. Mark reported
that jobs are running under both CentOS65 and CentOS7
for this initial test.</li>
</ol>
<h3><span class="mw-headline"
id="Split_of_.2Fgroup_and_multi-factor_authentication_.28MFA.29_issues">Split
of /group and multi-factor authentication (MFA) issues</span></h3>
<p>Paul Letta of CNI gave a <a rel="nofollow"
class="external text"
href="https://halldweb.jlab.org/talks/2016/Group%20Seperation%20Presentation.pptx">presentation</a>
describing the changes coming up in the new year. The
two major things to look for:
</p>
<ul>
<li> Split of the group disk directories into sensitive
(JSA Data) and non-sensitive (Open Science Data) file
systems.</li>
<li> Requirement of an MFA token to access JSA Data.</li>
</ul>
<p>One general theme (among others) is that, by and large,
Lab Users from collaborating institutions will not be
affected by this change. Another is that those working
with internal Lab documents for the bulk of their work,
for example folks in Procurement, will need the token
for most of their work.
</p>
<p>Please see his slides for the details and exact
definitions.
</p>
<h3><span class="mw-headline"
id="Review_of_minutes_from_the_last_meeting">Review of
minutes from the last meeting</span></h3>
<p>We looked over the <a
href="https://halldweb.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_November_9,_2016#Minutes"
title="GlueX Offline Meeting, November 9, 2016">minutes
from November 9</a>. Mark reminded us that the <a
href="https://halldweb.jlab.org/wiki/index.php/Software_Review_4"
title="Software Review 4">Software Review</a> was held
just after that meeting. It went very well for us; the
only recommendation was to explore doing data
compression in the crates to help with bandwidth.
</p>
<h3><span class="mw-headline"
id="SciComp_Meeting_of_November_17">SciComp Meeting of
November 17</span></h3>
<p>Mark flashed <a rel="nofollow" class="external text"
href="https://markito3.wordpress.com/2016/11/18/scicomp-meeting-notes-november-17-2016/">his
notes from the meeting</a>. Main message: the CentOS7
farm nodes are up and running now.
</p>
<h3><span class="mw-headline" id="Launches">Launches</span></h3>
<p>Alex A. brought us up to date on the on-going Analysis
Launch.
</p>
<ul>
<li> He is using the 40 new CentOS7 nodes, each with 72
threads available. However he is only able to run 18
threads though he is running alone on the node due to
memory usage.</li>
<li> Why so much memory? There are 100 reactions being
analyzed, including 40 from Ryan Mitchell's new,
comprehensive, final-state-survey plug-in.</li>
<li> We are now just shy of the 50% point.</li>
<li> Paul is working on memory reduction in the analysis
library. The major culprit are high-multiplicity final
states, which generate many kinematic fits, each fit
producing a large error matrix that needs to be saved.
One thing he is trying is to save the matrices as
floats, not doubles.</li>
<li> It was noted that there are just a few plug-ins
responsible for high memory demand. </li>
<li> Mark wondered if there are photon quality cuts that
can be applied to reduce the number of particle
combinations tried. The threshold is already at 100
MeV which we would not like to increase, but perhaps
there are other parameters to play with.</li>
<li> Alex estimates that "the first part[?]" will be
done in 10 days, with the second part running over the
holiday shutdown.</li>
<li> Alex showed us the <a rel="nofollow"
class="external text"
href="https://halldweb.jlab.org/data_monitoring/analysis/summary_swif_output_analysis_2016-02_ver05_batch01.html">Launch
webpage</a>. The jobs are running at a steady rate,
maintaining 40 instances corresponding the the 40 new
nodes.</li>
</ul>
<h3><span class="mw-headline"
id="Geometry_Issues_in_sim-recon">Geometry Issues in
sim-recon</span></h3>
<p>Sean presented ideas he will flesh-out in an upcoming
GlueX Note. He addressed the issue of how we handle
changes in geometry, either due to reconfiguration (both
major and minor), or re-assessments of positions at a
fixed point in time (for example development of better
alignment procedures). Both of these sources of
variations are naturally captured in the CCDB. His
proposal is to (a) control the version of HDDS XML files
via the CCDB for configuration changes and (b) also
control a set of offsets, hopefully small, in the CCDB
that capture variation from an ideal geometry. He also
presented the structure for serving out geometry
information inside JANA. Please see <a rel="nofollow"
class="external text"
href="https://halldweb.jlab.org/wiki/images/e/e2/GeometryScheme_20161207.pdf">his
slides</a> for details.
</p>
<p>We had some discussion of how we decide which
information goes where: does some particular change in
an offset represent a configuration change and thereby
requires a new XML file, or simply a run-dependent
variation from some nominal setting. We will have to
develop a philosophy on deciding these questions at some
point.
</p>
<h3><span class="mw-headline" id="Event_Viewer_Plans">Event
Viewer Plans</span></h3>
<p>Thomas is looking into developing a new event viewer
for GlueX. He has been reviewing features of hdview2 as
well as looking at adopting the ROOT-based EVE package
for rendering a 3D representation of the detector. He
has already succeeding in generating pictures with EVE
using the existing ROOT geometry generated by the HDDS
package. Dmitry Romanov did some work along these lines
in the past. Thomas hopes to work with him when his
visit starts in February.
</p>
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