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Please find the minutes below and at<br>
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<a class="moz-txt-link-freetext" href="https://halldweb.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_January_20,_2016">https://halldweb.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_January_20,_2016</a><br>
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<h1 id="firstHeading" class="firstHeading" style="font-weight:
bold;" lang="en"><span dir="auto">GlueX Offline Meeting,
January 20, 2016</span>, Minutes</h1>
<div id="bodyContent" class="mw-body-content"><span
class="mw-headline" id="Minutes"></span>
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lang="en">
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">Present:</p>
<ul style="list-style-type: square;">
<li><b>CMU</b>: Naomi Jarvis, Mike Staib</li>
<li><b>FIU</b>: Mahmoud Kamel</li>
<li><b>JLab</b>: Mark Ito (chair), David Lawrence, Paul
Mattione, Dmitry Romanov, Nathan Sparks, Sascha Somov,
Justin Stevens, Simon Taylor, Beni Zihlmann</li>
<li><b>NU</b>: Sean Dobbs</li>
<li><b>UConn</b>: James McIntyre</li>
</ul>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline" id="Announcements">Announcements</span></h3>
<ol>
<li><b>DL1Trigger added</b>. David led us through<span
class="Apple-converted-space"> </span><a
rel="nofollow" class="external text"
href="https://mailman.jlab.org/pipermail/halld-offline/2016-January/002198.html"
style="color: inherit !important; padding: 0px
!important; text-decoration: inherit !important;
background: transparent;">his email</a>. Trigger bits
from both the GTP and the front panel of the TS are now
produced from a JANA factory. Sascha will put together a
list of quasi-permanent trigger bit assignments.</li>
<li><b>Upgrade to Xerces-C++ done</b>. Mark flashed his<span
class="Apple-converted-space"> </span><a
rel="nofollow" class="external text"
href="https://mailman.jlab.org/pipermail/halld-offline/2016-January/002202.html"
style="color: inherit !important; padding: 0px
!important; text-decoration: inherit !important;
background: transparent;">email</a><span
class="Apple-converted-space"> </span>from last
Thursday. Builds of JANA, HDDS, and sim-recon against
both 3.1.1 and 3.1.2 are available, but the default is
3.1.2.
<ul style="list-style-type: square;">
<li>Nathan asked about using Xerces-C++ from the
various Linux distributions rather than building our
own. Beni reported difficulty doing this under
Ubuntu. CentOS6 is at 3.0.1, relatively old. We do
have the build-our-own thing under control as well.
We concluded there is no pressure to switch, but it
is something to keep in mind.</li>
</ul>
</li>
<li><b>Compiler Survey Responses In</b>. Mark told us that
most sites report that they are using GCC 4.4. As a
result we should probably delay allowing developers to
use language features only supported by more recent
versions.</li>
<li><b>Sim-recon 1.9.0 tagged on GitHub</b>. Mark made the
announcement. Notably it includes the new "curving
shower" BCAL code from Tegan.</li>
<li><b>Paper-based Software Review</b>. Mark and David
reported that Chip Watson and Graham Heyes are thinking
about having a software review where only written
reports will be circulated, no visiting committee. They
have asked for documentation about how we are doing with
respect to previous review recommendations and
significant updates on software progress. They would
also like us to update our computing resource
requirement estimates.</li>
<li><b>Corrupted files on Lustre</b>. From the Computer
Center website:<br>
</li>
</ol>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">Due to a hardware failure over the
weekend, a small subset of files on the scientific
computing Lustre system were lost. This affects files in
/work, /cache, and /volatile. If your data is affected,
file access attempts will return the error "Cannot send
after transport endpoint shutdown". The scientific
computing group is working on automatically removing the
affected files. Users who see this message in the meantime
should remove the files with the "unlink" command, after
which each file can be manually recreated. The Scientific
Computing group is working with the vendor on a long term
stability fix for the affected file servers.</p>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline"
id="Review_of_minutes_from_January_6">Review of<span
class="Apple-converted-space"> </span><a
href="https://halldweb.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_January_6,_2016#Minutes"
title="GlueX Offline Meeting, January 6, 2016"
style="color: rgb(85, 34, 0); padding: 0px !important;
text-decoration: underline; background: transparent;">minutes
from January 6</a></span></h3>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">Mark<span
class="Apple-converted-space"> </span><a rel="nofollow"
class="external text"
href="https://mailman.jlab.org/mailman/private/gluex-collaboration/2016-January/004184.html"
style="color: inherit !important; padding: 0px
!important; text-decoration: inherit !important;
background: transparent;">sent out the proposal</a><span
class="Apple-converted-space"> </span>for<span
class="Apple-converted-space"> </span><b>intentional
gaps in the sequence of run numbers</b><span
class="Apple-converted-space"> </span>to the
Collaboration. There was not a lot of discussion
generated. The group putting together sim1 have decided to
go ahead on the assumption that a run 10,000 start is a
good guess for the Spring.</p>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline" id="Collaboration_Meeting"><a
href="https://halldweb.jlab.org/wiki/index.php/GlueX-Collaboration-Feb-2016"
title="GlueX-Collaboration-Feb-2016" style="color:
rgb(85, 34, 0); padding: 0px !important;
text-decoration: underline; background: transparent;">Collaboration
Meeting</a></span></h3>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">Mark canvased the group for those
wishing to give a talk. He expects to hear from those
interested.</p>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline"
id="RCDB_vs._CCDB_for_Offline_Reconstruction.2FAnalysis">RCDB
vs. CCDB for Offline Reconstruction/Analysis</span></h3>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">Mark introduced the issue of whether
the offline analysis should get constants directly from
the RCDB or whether we should copy the constants to the
CCDB and access them from there. There are good arguments
on both sides. See<span class="Apple-converted-space"> </span><a
rel="nofollow" class="external text"
href="https://docs.google.com/presentation/d/1BkOeNoy63qzisLcjdHcahdeFDQlY78sVEJD0k01rpis/edit?usp=sharing"
style="color: inherit !important; padding: 0px
!important; text-decoration: inherit !important;
background: transparent;">his slides</a><span
class="Apple-converted-space"> </span>for details.</p>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">After much discussion, we settled on
a two-prong approach:</p>
<ol>
<li>Dmitry will write a C++ API for the RCDB. This is
likely essential for some online applications, but will
not become part of sim-recon right away.</li>
<li>We will also write some scripts to copy data from the
RCDB to the CCDB and see if any fundamental difficulties
reveal themselves.</li>
</ol>
</div>
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