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<p>One short section of farm performance got left out of the
minutes. It is on the wiki now, also find it below.</p>
<h3><span class="mw-headline" id="SciComp_System_Perfomance">SciComp
System Perfomance</span></h3>
<p>We got onto a digression on recent experience using the farm and
disk resources at JLab.
</p>
<ul>
<li> Richard reports short file life-times on the cache disk after
retrieval from tape, not associated with farm jobs, as short as
20 hours. We speculated that this was due to farm job usage of
the cache displacing files that would normally live for a week.</li>
<li> Random trigger files that are supposed to be "permanently"
pinned for year have disappeared. This causes problems for Monte
Carlo jobs on the OSG which need these files.</li>
<li> We commented that although we have a lot of space on the work
disk, there are usage storms on work that not only make file
retrieval extremely slow, but bring the ifarm nodes to a
standstill. When work was on Lustre this was not an issue, but
handling small files was a problem.</li>
</ul>
<div class="moz-cite-prefix">On 3/29/19 2:08 PM, Mark Ito wrote:<br>
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<blockquote type="cite"
cite="mid:f51d664d-62af-5fcb-1795-53849c678890@jlab.org">
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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,_March_26,_2019#Minutes">here</a>
and below.</p>
<p> -- Mark</p>
<p>_____________________________________</p>
<p> </p>
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<h1 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">Minutes, HDGeant4 Meeting, March 26, 2019</span></h1>
<div id="bodyContent" class="mw-body-content">
<div id="mw-content-text" dir="ltr" class="mw-content-ltr"
lang="en">
<p>Present: </p>
<ul>
<li> <b> JLab: </b> Alex Austregesilo, Thomas
Britton, Sean Dobbs, Mark Ito (chair),Richard Jones,
Simon Taylor</li>
</ul>
<p>There is a <a rel="nofollow" class="external text"
href="https://bluejeans.com/s/96_2v"
moz-do-not-send="true">recording of this meeting</a>
on the BlueJeans site. Use your JLab credentials to
access it. </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 went over <a
href="https://halldweb.jlab.org/wiki/index.php/HDGeant4_Meeting,_March_12,_2019#Minutes"
title="HDGeant4 Meeting, March 12, 2019"
moz-do-not-send="true">the minutes</a> without
significant comment. </p>
<h3><span class="mw-headline"
id="Do-over_on_comparison_studies">Do-over on
comparison studies</span></h3>
<p>Simon has run some single-particle gun simulations
for both HDG3 and HDG4 on the OSG. He has not had a
chance to look at them in detail yet. His initial
impression is that differences are seen in
calorimetry. </p>
<h3><span class="mw-headline"
id="Further_comparative_studies_of_calorimeter_response">Further
comparative studies of calorimeter response</span></h3>
<p>Richard showed <a rel="nofollow" class="external
text"
href="https://docs.google.com/presentation/d/1IDw4LD2GhBpzam9E1V8LRBcb49Kb1V3GMTWR2Inw2V8/edit?usp=sharing"
moz-do-not-send="true">some slides</a> describing
extensions of his work on low-level comparisons of
HDG3 and HDG4 for calorimetry. </p>
<ul>
<li> He looked at the residual non-linearity, albeit
up to 8 GeV, for reconstructed shower energy in the
FCAL. Agreement between HDG3 and HDG4 is very good
now, at all energies.</li>
<li> He has examined cluster time, relative to "RF".
Both HDG3 and 4 show the same linear systematic
dependence in relative time as a function of energy.</li>
<li> For BCAL energy response, he showed the same
residual non-linearity study as shown earlier for
the FCAL. Here the qualitative agreement is good,
with perhaps an 8 MeV upward shift of HDG4 relative
to HDG3. The effect of energy leakage out the back
of BCAL dominates the changes in the trends as polar
angle moves from far forward to 90 degrees.</li>
<li> For BCAL timing, he noted a difference in the
algorithm used to get cluster timing between HDG3
and HDG4
<ul>
<li> HDG3 uses energy-weighted average shower
times</li>
<li> HDG4 uses the earliest hit per sector for
times</li>
</ul>
</li>
<li> We noted that mcsmear smears the BCAL timing by
55 ps, not a lot. Richard sees this in his study.</li>
<li> The difference in the BCAL algorithms does not
make much apparent difference. He suggests we use
energy weighted for both to be consistent.</li>
<li> Richard is planning to deprecate the
bcalSiPMUpHit and bcalSiPMDownHit elements in HDDM
in favor of a single bcalTruthCell element that can
serve information from both upsteam and downstream
ends of the BCAL,</li>
<li> There is still an issue that Alex sees with the
ρ's albeit with charged tracks and not
electromagnetic showers. Hopefully Simon's
single-track studies will address it.</li>
</ul>
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