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Colleagues,<br>
<br>
Find the meeting minutes reproduced below and at<br>
<br>
<a class="moz-txt-link-freetext" href="https://halldweb.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_September_2,_2015#Minutes">https://halldweb.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_September_2,_2015#Minutes</a>
.<br>
<br>
-- Mark<br>
________________________________________________<br>
<br>
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<h1 id="firstHeading" class="firstHeading" style="font-weight:
bold;" lang="en"><span dir="auto">GlueX Offline Meeting,
September 2, 2015</span>, Minutes</h1>
<div id="bodyContent" class="mw-body-content"><span
class="mw-headline" id="Minutes"></span>
<div id="mw-content-text" dir="ltr" class="mw-content-ltr"
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>: Curtis Meyer, Mike Staib</li>
<li><b>FIU</b>: Mahmoud Kamel</li>
<li><b>FSU</b>: Brad Cannon, Aristeidis Tsaris</li>
<li><b>JLab</b>: Alex Barnes, Amber Boehnlein, Mark
Dalton, Mark Ito (chair), Paul Mattione, Eric Pooser,
Nathan Sparks, Justin Stevens, Simon Taylor, Beni
Zihlmann</li>
<li><b>UConn</b>: Richard Jones, James McIntyre</li>
</ul>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">There is a<span
class="Apple-converted-space"> </span><a rel="nofollow"
class="external text"
href="https://bluejeans.com/s/8xII/" style="color:
inherit !important; padding: 0px !important;
text-decoration: inherit !important; background:
transparent;">recording of this meeting</a><span
class="Apple-converted-space"> </span>on the BlueJeans
site.</p>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline" id="Announcements">Announcements</span></h3>
<ol>
<li>The<span class="Apple-converted-space"> </span><b>location
of the nightly builds</b><span
class="Apple-converted-space"> </span>at JLab has
changed.
<ul style="list-style-type: square;">
<li>Old location example:
<ul style="list-style-type: square;">
<li><code>/u/scratch/gluex/nightly/2015-09-02/sim-recon</code></li>
</ul>
</li>
<li>New location example:
<ul style="list-style-type: square;">
<li><code>/u/scratch/gluex/nightly/2015-09-02/Linux_RHEL6-x86_64-gcc4.4.7/sim-recon</code></li>
</ul>
</li>
</ul>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">See the<span
class="Apple-converted-space"> </span><a
href="https://halldweb.jlab.org/wiki/index.php/Nightly_Builds_of_GlueX_Software"
title="Nightly Builds of GlueX Software"
style="color: rgb(85, 34, 0); padding: 0px
!important; text-decoration: underline; background:
transparent;">nightly builds wiki page</a><span
class="Apple-converted-space"> </span>for more on
the system.</p>
</li>
<li><b>Sim-recon 1.5.1 has been released</b>. The<span
class="Apple-converted-space"> </span><a
rel="nofollow" class="external text"
href="https://github.com/JeffersonLab/sim-recon/releases/tag/1.5.1"
style="color: inherit !important; padding: 0px
!important; text-decoration: inherit !important;
background: transparent;">release notes</a><span
class="Apple-converted-space"> </span>are posted at
GitHub.</li>
<li>We are now<span class="Apple-converted-space"> </span><b>deleting
CCDB SQLite databases older than one year</b>.
Formerly we were never deleting the monthly files. See
the<span class="Apple-converted-space"> </span><a
href="https://halldweb.jlab.org/wiki/index.php/SQLite-form_of_the_CCDB_database#Archive_of_SQLite_Files"
title="SQLite-form of the CCDB database" style="color:
rgb(85, 34, 0); padding: 0px !important;
text-decoration: underline; background: transparent;">wiki
page</a><span class="Apple-converted-space"> </span>describing
the system for more information.</li>
<li>After filling up last week, our<span
class="Apple-converted-space"> </span><b>work disk was
expanded</b><span class="Apple-converted-space"> </span>from
14 to 15 TB. Further expansion will require movement of
the partition to a new file server.</li>
<li>Mailman.jlab.org has been blocked from off-site for
the past week or two due to cyber attacks. This
restricts access to the mail archives and list
administration pages, but does not affect the operation
of the email lists. Access is not restricted from inside
the JLab firewall.</li>
<li>Mark drew our attention to his<span
class="Apple-converted-space"> </span><a
rel="nofollow" class="external text"
href="http://argus.phys.uregina.ca/cgi-bin/public/DocDB/ShowDocument?docid=2793"
style="color: inherit !important; padding: 0px
!important; text-decoration: inherit !important;
background: transparent;">new note on GlueX builds</a>.</li>
<li>Kei gave a report on the last launch. See<span
class="Apple-converted-space"> </span><a
rel="nofollow" class="external text"
href="https://halldweb.jlab.org/wiki/images/1/10/2015-09-02-offline_monitoring.pdf"
style="color: inherit !important; padding: 0px
!important; text-decoration: inherit !important;
background: transparent;">his slides</a><span
class="Apple-converted-space"> </span>for the details.
<ul style="list-style-type: square;">
<li>There were a lot of problems this time.</li>
<li>Kei continues to feedback to Chris Larrieu on SWIF
developments.</li>
<li>The memory footprint of the jobs nearly doubled.</li>
<li>The next launch is scheduled for September 12.</li>
</ul>
</li>
</ol>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline"
id="Review_of_minutes_from_August_19">Review of minutes
from August 19</span></h3>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">We went over<span
class="Apple-converted-space"> </span><a
href="https://halldweb.jlab.org/wiki/index.php/GlueX_Offline_Meeting,_August_19,_2015#Minutes"
title="GlueX Offline Meeting, August 19, 2015"
style="color: rgb(85, 34, 0); padding: 0px !important;
text-decoration: underline; background: transparent;">the
minutes</a>.</p>
<h4 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline" id="Hall_D_Package_Manager">Hall D
Package Manager</span></h4>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">Nathan made changes to support the
use of a version.xml to create templates, as per feedback
from the meeting.</p>
<h4 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline" id="Flash_ADC_Pulse_Processing">Flash
ADC Pulse Processing</span></h4>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">David convened a meeting of the
interested parties. We will ask for a report at a future
meeting.</p>
<h4 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline"
id="Who_is_responsible_for_deleting_Git_branches.3F">Who
is responsible for deleting Git branches?</span></h4>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">Our policy of having the branch
creator delete branches after they have been merged is
still in place, though compliance has been spotty.</p>
<h4 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline" id="Clang_on_the_CUE">Clang on the
CUE</span></h4>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">Nathan reported that Clang is already
in stalled on the ifarm, but was compiled against GCC
4.8.3, whereas the default compiler there is GCC 4.4.7.
That means that all packages might have to be compiled
with the newer version. The system for supporting that for
GlueX software has not been worked out.</p>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline" id="Geant4_Update">Geant4 Update</span></h3>
<ul style="list-style-type: square;">
<li>Richard has now configured the geometry to have the
same magnetic field in all layers. This makes it
insensitive to the algorithm Geant4 uses for picking the
field-setting geometry layer. He is deferring an
evaluation of the CPU cost of keeping the field on in
the calorimeter volumes for a later stage of development
work.</li>
<li>He looked at how the current implementation performs
with multi-threading turned on in Geant4. Initially the
program was crashing. He traced the problem to a bug in
the way geometry information is shared by threads. David
had previously seen this and a fix was attempted by the
Geant4 team. Unfortunately, the fix leads to other
serious problems. Richard has put together his own patch
in user code so he can keep going. He has also
communicated his ideas for a more fundamental fix to the
Geant4 folks.</li>
<li>With multi-threading working properly, he sees perfect
scaling of performance on an 8-core machine, up to 6
threads (as high as he tried).</li>
<li>The next step is to put together an end-to-end scheme
for hit generation for a single detector system. That
way others who might want to contribute will have a
complete example to follow. He is planning on doing this
with the CDC.</li>
</ul>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline" id="Collaboration_Meeting_Agenda">Collaboration
Meeting Agenda</span></h3>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">We discussed the agenda for the
upcoming<span class="Apple-converted-space"> </span><a
href="https://halldweb.jlab.org/wiki/index.php/GlueX-Collaboration-Oct-2015"
title="GlueX-Collaboration-Oct-2015" style="color:
rgb(85, 34, 0); padding: 0px !important;
text-decoration: underline; background: transparent;">Collaboration
Meeting</a>, October 8-10, 2015 at Jefferson Lab.
Possible talks and speakers are:</p>
<ul style="list-style-type: square;">
<li>Overview talk in including data challenge 3 report
(Mark)</li>
<li>Geant4 Development Update (Richard)</li>
<li>Version Management System (Mark)</li>
<li>Offline Monitoring and SWIF (Kei)</li>
<li>Calibration Overview (Sean Dobbs)</li>
</ul>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline" id="Data_Challenge_3_update">Data
Challenge 3 update</span></h3>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">Mark has run through the fake raw
data set twice now. He showed<span
class="Apple-converted-space"> </span><a
href="https://halldweb.jlab.org/wiki/index.php/Data_Challenge_3"
title="Data Challenge 3" style="color: rgb(85, 34, 0);
padding: 0px !important; text-decoration: underline;
background: transparent;">plots</a><span
class="Apple-converted-space"> </span>of the number of
jobs in various stages of batch farm progress as a
function of time. The fluctuations are large and depend
largely on what other users on the farm are doing.</p>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">He is currently working on converting
the job submission process to use SWIF to see if that
helps throughput.</p>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline" id="Commissioning_Simulations">Commissioning
Simulations</span></h3>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">Mark transmitted some thoughts from
Sean, sent in an email.</p>
<ul style="list-style-type: square;">
<li><b><a
href="https://halldweb.jlab.org/wiki/index.php/Spring_2015_Commissioning_Simulations"
title="Spring 2015 Commissioning Simulations"
style="color: rgb(85, 34, 0); padding: 0px
!important; text-decoration: underline; background:
transparent;">Spring 2015 Commissioning Simulations</a></b>.
The plan is to generate a few thousand files with the
latest tagged sim-recon version only for run 9306.</li>
<li><b>Fall 2015 Commissioning Simulations</b>. Sean
thought we should start a discussion about how to set
conditions for simulations for a possible Fall run. The
Calibration Group has already decided to require a
separate CCDB variation name.
<ul style="list-style-type: square;">
<li>Justin thought that we should have production
underway by the time of the collaboration meeting so
people can estimate yields for the run.</li>
<li>Given the uncertainty in the conditions we might
have, we thought that we will probably have to just
pick some parameters and simulate those, say a 9 GeV
coherent edge and 1300 A magnet current.</li>
</ul>
</li>
</ul>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline"
id="Some_problems_with_F125_algorithms.3F">Some problems
with F125 algorithms?</span></h3>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">Mike led us through<span
class="Apple-converted-space"> </span><a rel="nofollow"
class="external text"
href="https://mailman.jlab.org/pipermail/halld-offline/2015-August/002138.html"
style="color: inherit !important; padding: 0px
!important; text-decoration: inherit !important;
background: transparent;">his recent email</a><span
class="Apple-converted-space"> </span>describing
problems related to FADC hit in the BCAL with negative
pulse integrals. The problem occurs for Mode 7 data and
can be understood by looking at Mode 8 data where the
read-out threshold is greater than 1/2 the peak amplitude.
The result is early times for pulses late in the window.</p>
<p style="widows: 3; orphans: 3; margin: 1em 0px;
line-height: 1.2em;">We noted that there are two
approaches on could take for Mode 8 data: emulated the
Mode 7 algorithm, bugs and all, or modify the algorithm to
give rational results in the problematic cases. There is a
group meeting (see Review of Minutes above) on the
emulation and we thought that they would very likely be
working on an formulating an approach to the problem.</p>
<h3 style="page-break-after: avoid; font-weight: bold;"><span
class="mw-headline" id="Action_Items">Action Items</span></h3>
<ul style="list-style-type: square;">
<li>Convert DC3 to use SWIF (Mark)</li>
<li>Re-do Spring simulation with new release (Mark)</li>
<li>Implement a complete hit generation scheme for the CDC
in Geant4 (Richard)</li>
</ul>
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