<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<p>Container Launchers,</p>
<p>Please find the notes below and at</p>
<p>
<a class="moz-txt-link-freetext" href="https://halldweb.jlab.org/wiki/index.php/GlueX_Containers_Meeting,_March_30,_2018">https://halldweb.jlab.org/wiki/index.php/GlueX_Containers_Meeting,_March_30,_2018</a></p>
<p> -- Mark</p>
<p>________________</p>
<p>
</p>
<div id="globalWrapper">
<div id="column-content">
<div id="content" class="mw-body" role="main">
<h1 id="firstHeading" class="firstHeading" lang="en"><span
dir="auto">GlueX Containers Meeting, March 30, 2018</span></h1>
<div id="bodyContent" class="mw-body-content">
<div id="mw-content-text" dir="ltr" class="mw-content-ltr"
lang="en">
<h3><span class="mw-headline" id="Notes">Notes</span></h3>
<p>Present: Sean Dobbs, Mark Ito, Thomas Britton, Beni
Zihlmann, Zisis Papandreau, David Lawrence, Richard
Jones
</p>
<ul>
<li> Atlas and CMS and OSG et al. designed a grid to do
raw data reconstruction.
<ul>
<li> MC was not considered a problem</li>
<li> The tiered system has as a component the raw
data distribution system</li>
<li> software and databases were staged as "image
files"</li>
</ul>
</li>
<li> XROOTD
<ul>
<li> originally developed at SLAC</li>
<li> redirector: directory service, contains meta
data (file locations)</li>
<li> on the local host open a file just like a local
file except file name is replaced with a URL like
root://<name of catalog><IP name of
redirector><file name>, triggers an open
over network</li>
<li> redirector refers opener to site, a data
connection is opened on site, data streamed over
connection</li>
<li> our bandwidth requirements should be OK</li>
<li> David: at NERSC, 64 threads on a single node,
reconstruction, 4 MB/s read rate</li>
<li> there is a caching system, if everything is
mostly working cache, is not heavily used</li>
</ul>
</li>
<li> UConn demo system
<ul>
<li> redirector service started</li>
<li> 50 servers, each serving a few files</li>
<li> 10 Gb pipe</li>
</ul>
</li>
<li> Client side responsibilities
<ul>
<li> download and build XROOTD</li>
<li> set-up ld_preload[?]</li>
<li> open calls get intercepted and redirected to
XROOTD system</li>
</ul>
</li>
<li> Sean has also messed with setting up an XROOTD
server</li>
<li> David mentioned the XROOTD idea to Amber Boehnlein,
she seems supportive
<ul>
<li> Consensus that it would be best if
infrastructure supported at JLab on the submit
host</li>
<li> Could be used for both raw data and random
trigger files</li>
<li> Richard and Thomas will work on staging random
triggers on UConn demo system</li>
</ul>
</li>
<li> David: Chip may allow Physics to use 5% of future
LQCD KNL cluster</li>
<li> David: planning for summer campaign at NERSC,
reconstruction
<ul>
<li> Sean: candidates for off-site resource
campaigns:
<ul>
<li> ρ and ω yield measurements with 10 or 20
files per run</li>
<li> 2017 data: 2 periods, low intensity and
high intensity</li>
<li> 2018 data: 4 periods</li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
<div class="printfooter">
Retrieved from "<a dir="ltr"
href="https://halldweb.jlab.org/wiki/index.php?title=GlueX_Containers_Meeting,_March_30,_2018&oldid=86291">https://halldweb.jlab.org/wiki/index.php?title=GlueX_Containers_Meeting,_March_30,_2018&oldid=86291</a>"</div>
</div>
</div>
</div>
<div id="footer" role="contentinfo">
<ul id="f-list">
<li id="lastmod"> This page was last modified on 7 April 2018,
at 21:52.</li>
</ul>
</div>
</div>
</body>
</html>