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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Good find, David. Did you file a ticket on the slowness with OSDC Support?<br>
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When you run ssh -vvv, does the timing of log output suggest where the problem is?<br>
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Can you run into some tool like typescript, or a "screen" log, that will timestamp the records, and send those to OSDC Support?<br>
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<div>- Mike </div>
<div>--</div>
<div>Michael Wilde</div>
<div>Mathematics and Computer Science Computation Institute</div>
<div>Argonne National Laboratory The University of Chicago</div>
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<div style="direction: ltr;" id="divRpF985192"><font color="#000000" face="Tahoma" size="2"><b>From:</b> swift-user-bounces@ci.uchicago.edu [swift-user-bounces@ci.uchicago.edu] on behalf of David Kelly [davidkelly@uchicago.edu]<br>
<b>Sent:</b> Monday, February 17, 2014 2:14 PM<br>
<b>To:</b> Matthew Shaxted<br>
<b>Cc:</b> swift-user@ci.uchicago.edu<br>
<b>Subject:</b> Re: [Swift-user] Coaster Service Startup Time on OSDC<br>
</font><br>
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<div>
<div dir="ltr">Hi Matthew,
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<div>I set up a test on OSDC with 10 nodes. I did notice something strange there. When I try to SSH from the Sullivan head node to one of my CentOS instances, it takes much longer than it should:</div>
<div><br>
</div>
dkelly@kg14-compute-1:~$ time ssh <a href="mailto:root@172.16.1.236" target="_blank">root@172.16.1.236</a> ls<br>
Warning: Permanently added '172.16.1.236' (RSA) to the list of known hosts.<br>
anaconda-ks.cfg<br>
install.log<br>
install.log.syslog
<div><br>
real 0m25.197s</div>
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<div>Are you running start-coaster-service from the Sullivan head node? For each node in your node list, there are three SSH commands (one to create a directory structure, one to scp the <a href="http://worker.pl/" target="_blank">worker.pl</a> script there,
and one to launch <a href="http://worker.pl/" target="_blank">worker.pl</a>). This is done serially in the 0.94 branch. I can see how this would take very long. I will make some changes to speed up start-coaster-service, but in the meantime, here are a few
suggestions:</div>
<div><br>
</div>
<div>1. The SSH slowness seems to only be from the Sullivan head node to the VMs. SSH connections from one VM to another VM is pretty quick. Are you able to run Swift and start-coaster-service on a VM?</div>
<div><br>
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<div>2. Is a persistent coasters setup needed here? OSDC has an option to launch instances as a cluster, which makes available a PBS scheduler. You could set this up and avoid the need to start and manage workers yourself. </div>
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<div>Let me know what you think. I have some example OSDC/PBS configs if you decide to go that route.</div>
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<div>Thanks,</div>
<div>David</div>
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<div class="gmail_extra"><br>
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<div class="gmail_quote">On Thu, Feb 13, 2014 at 1:04 PM, Matthew Shaxted <span dir="ltr">
<<a href="mailto:Matthew.Shaxted@som.com" target="_blank">Matthew.Shaxted@som.com</a>></span> wrote:<br>
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<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1f497d">Sure thing David,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1f497d">I have a setup.sh script that exports WORKER_HOSTS IP addresses from a txt file (see attached) – all nodes are running centOS.
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1f497d">The conf file I am using is also attached. I’m using swift-0.94.1.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1f497d">Many thanks,<u></u><u></u></span></p>
<div class="">
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1f497d">Matthew<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:7.5pt; font-family:"Microsoft Sans Serif","sans-serif"; color:red; text-transform:uppercase">MATTHEW SHAXTED</span><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1f497d; text-transform:uppercase"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1f497d"> <u></u><u></u></span></p>
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</span><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1f497d; text-transform:uppercase"><u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:7.5pt; font-family:"Microsoft Sans Serif","sans-serif"; color:#1f497d">The information contained in this communication may be confidential, is intended only for the use of the recipient(s) named above, and may be
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<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1f497d"> <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1f497d"><img src="cid:image002.png@01CF28BC.0C826AB0" alt="cid:image93798a.gif@f078f826.ddd94773" border="0" height="17" width="392"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1f497d"><u></u> <u></u></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif""> David Kelly [mailto:<a href="mailto:davidkelly@uchicago.edu" target="_blank">davidkelly@uchicago.edu</a>]
<br>
<b>Sent:</b> Thursday, February 13, 2014 12:53 PM<br>
<b>To:</b> Matthew Shaxted<br>
<b>Cc:</b> <a href="mailto:swift-user@ci.uchicago.edu" target="_blank">swift-user@ci.uchicago.edu</a><br>
<b>Subject:</b> Re: [Swift-user] Coaster Service Startup Time on OSDC<u></u><u></u></span></p>
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<div>
<div class="h5">
<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Hi Matthew,<u></u><u></u></p>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
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<div>
<p class="MsoNormal">Could you please explain a little more about how you're starting the coaster-service and workers? Are you using the start-coaster-service script? If you are, could you please send the coaster-service.conf file you're using? Which version
of Swift is this? <u></u><u></u></p>
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<div>
<p class="MsoNormal"><u></u> <u></u></p>
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<div>
<p class="MsoNormal">There may be some things we can do to speed up the process - just need to get a better understanding of how things are set up and where the delays are coming from. Thanks!<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Regards,<u></u><u></u></p>
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<p class="MsoNormal">David<u></u><u></u></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><u></u> <u></u></p>
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<p class="MsoNormal">On Thu, Feb 13, 2014 at 12:23 PM, Matthew Shaxted <<a href="mailto:Matthew.Shaxted@som.com" target="_blank">Matthew.Shaxted@som.com</a>> wrote:<u></u><u></u></p>
<div>
<div>
<p class="MsoNormal">Dear Swift User Group:<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">I working with a 60-node cluster running on OSDC now, and when I try to start the Swift coaster-service for these nodes, it takes about 30 seconds (or more) per node to successfully start.
<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">This is an issue for me as it limits how often I want to shut down the coaster-service - for this 60 node cluster it could take up to 30 min to start up again.<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">Is this starting coaster behavior normal? Is there anything I can do to make the coaster-service start faster?<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">Thanks,<br>
Matthew<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:7.5pt; font-family:"Microsoft Sans Serif","sans-serif"; color:red; text-transform:uppercase">MATTHEW SHAXTED</span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:7.5pt; font-family:"Microsoft Sans Serif","sans-serif"; text-transform:uppercase">SKIDMORE, OWINGS & MERRILL LLP <span style="color:#1f497d">
</span></span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:7.5pt; font-family:"Microsoft Sans Serif","sans-serif"; color:#736f6e; text-transform:uppercase">224 South Michigan Ave.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:7.5pt; font-family:"Microsoft Sans Serif","sans-serif"; color:#736f6e; text-transform:uppercase">Chicago, IL 60604</span><u></u><u></u></p>
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<a href="tel:312.360.4368" target="_blank">312.360.4368</a></span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:7.5pt; font-family:"Microsoft Sans Serif","sans-serif"; color:#736f6e; text-transform:uppercase">FAX:
<a href="tel:312.360.4545" target="_blank">312.360.4545</a></span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d"><a href="mailto:matthew.shaxted@som.com" target="_blank"><span style="font-size:7.5pt; text-transform:uppercase">matthew.shaxted@som.com</span></a></span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d"><img src="cid:image001.png@01CF28BC.0C826AB0" alt="cid:image9d6458.png@2965c709.c87949ac" border="0" height="40" width="78"></span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d"><a href="http://www.som.com/" target="_blank"><span style="font-size:7.5pt">WWW.SOM.COM</span></a></span><span style="font-size:5.5pt; color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="color:#1f497d"> </span><u></u><u></u></p>
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