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<NewsItem contentIssues="false" id="96131" important="true" status="posted" url="https://beta.my.umbc.edu/groups/hpcf/posts/96131">
<Title>Scheduled Power Outage Affecting HPCF</Title>
<Body>
<![CDATA[
    <div class="html-content">Hi Everyone,<div><br></div><div>The user nodes (taki-usr1 &amp; taki-usr2) are now safely shut-down in preparation for the scheduled power outage in the data center that houses the cluster. All running jobs were stopped.</div><div><br></div><div>Please note that for those of you with access to research storage separate from the HPCF, we are bringing research storage systems down as well.</div><div><br></div><div>We expect all research storage systems to be back online tomorrow afternoon.</div><div><br></div><div>Thanks for reading and stay tuned to this myUMBC Group for further updates and related news &amp; events.</div><div><br></div><div>-Roy Prouty</div><div>System Administrator on UMBC HPCF</div></div>
]]>
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<Summary>Hi Everyone,    The user nodes (taki-usr1 &amp; taki-usr2) are now safely shut-down in preparation for the scheduled power outage in the data center that houses the cluster. All running jobs were...</Summary>
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<PostedAt>Mon, 28 Sep 2020 20:14:09 -0400</PostedAt>
<EditAt>Mon, 28 Sep 2020 20:14:34 -0400</EditAt>
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<NewsItem contentIssues="false" id="95981" important="true" status="posted" url="https://beta.my.umbc.edu/groups/hpcf/posts/95981">
<Title>Taki Shutting Down 9/28 for a Day</Title>
<Tagline>Power repair work required at Taki location</Tagline>
<Body>
<![CDATA[
    <div class="html-content">Taki will be shutdown for some power work at the Research Park Computer room. Taki will be offline from 9/28 at 8 pm to 9/29 at 5 pm. All jobs will be terminated when Taki is shutdown, so please plan according. Let us know if you have any questions.</div>
]]>
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<Summary>Taki will be shutdown for some power work at the Research Park Computer room. Taki will be offline from 9/28 at 8 pm to 9/29 at 5 pm. All jobs will be terminated when Taki is shutdown, so please...</Summary>
<Website>http://hpcf.umbc.edu/</Website>
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<PostedAt>Tue, 22 Sep 2020 11:37:57 -0400</PostedAt>
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<NewsItem contentIssues="true" id="95634" important="false" status="posted" url="https://beta.my.umbc.edu/groups/hpcf/posts/95634">
<Title>Oklahoma Supercomputing Symposium 2020</Title>
<Tagline>Free-of-charge all-videoconferencing edition on Wed Sept 30</Tagline>
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<![CDATA[
    <div class="html-content"><pre>OKLAHOMA SUPERCOMPUTING SYMPOSIUM 2020&#x000A;    Wed Sep 30 2020, 9:00am-5:00pm Central Time&#x000A;    Our first all-videoconferencing edition!&#x000A;    Contact: Henry Neeman (<a href="https://webmail.umbc.edu/webmail/src/compose.php?send_to=hneeman%40ou.edu" rel="nofollow external" class="bo">hneeman@ou.edu</a>)&#x000A;    &#x000A;    <a href="http://symposium2020.oscer.ou.edu/" rel="nofollow external" class="bo">http://symposium2020.oscer.ou.edu/</a>&#x000A;    &#x000A;    Please feel free to forward this to anyone who might be&#x000A;    interested -- undergraduates, graduate students, faculty,&#x000A;    staff, professionals, colleagues etc.&#x000A;    &#x000A;    If you've received this note in error, or you've&#x000A;    already registered, please ignore it, or forward it to others.&#x000A;    &#x000A;    DETAILS:&#x000A;    &#x000A;    Are you interested in the FREE Oklahoma Supercomputing&#x000A;    Symposium 2020 on Wed Sep 30, live via videoconferencing&#x000A;    all day?&#x000A;    &#x000A;    SPEAKERS WILL INCLUDE:&#x000A;    &#x000A;    * Amy Friedlander, National Science Foundation&#x000A;    Office Director (Acting), Office of Advanced Cyberinfrastructure&#x000A;    &#x000A;    * John Shalf, Lawrence Berkeley National Laboratory&#x000A;    Department Head for Computer Science&#x000A;    &#x000A;    * Dan Stanzione, Texas Advanced Computing Center, U Texas Austin&#x000A;    Executive Director&#x000A;    &#x000A;    * Tom Lange, Technology Optimization &amp; Management LLC&#x000A;    &#x000A;    For the 2020 Symposium, we've already had:&#x000A;    &#x000A;    * 50 registrations in under 15 hours;&#x000A;    &#x000A;    * 100 registrations in under 19 hours;&#x000A;    &#x000A;    * 150 registrations in less than a week;&#x000A;    &#x000A;    * 200 registrations in less than a month!&#x000A;    &#x000A;    Over the past 18 Symposia, we've had over 4500 attendees from&#x000A;    127 academic institutions from 28 US states and territories,&#x000A;    178 private companies, 36 government agencies (federal, state,&#x000A;    municipal, foreign) and 21 non-governmental organizations.&#x000A;    &#x000A;    The 2019 Symposium had 175 attendees, from l7 academic&#x000A;    institutions in 5 states, 11 private companies,&#x000A;    8 government agencies and 3 non-governmental organizations.&#x000A;    &#x000A;    We'd be delighted to have you participate. It's a great way to&#x000A;    learn what's happening on the advanced computing side of your&#x000A;    research, teaching and professional areas.&#x000A;    &#x000A;    And, if you know of students -- graduate, undergraduate, community&#x000A;    college, career tech, high school -- who are interested in these&#x000A;    areas, this is a great opportunity to introduce them to&#x000A;    conferences, especially because it's FREE.&#x000A;    &#x000A;    Contact:&#x000A;    &#x000A;    Henry Neeman (<a href="https://webmail.umbc.edu/webmail/src/compose.php?send_to=hneeman%40ou.edu" rel="nofollow external" class="bo">hneeman@ou.edu</a>)&#x000A;    Director, OU Supercomputing Center for Education &amp; Research (OSCER)&#x000A;    Associate Professor, Gallogly College of Engineering&#x000A;    Adjunct Associate Professor, School of Computer Science&#x000A;    OU Information Technology&#x000A;    The University of Oklahoma&#x000A;    </pre><div><br></div></div>
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<Summary>OKLAHOMA SUPERCOMPUTING SYMPOSIUM 2020 Wed Sep 30 2020, 9:00am-5:00pm Central Time Our first all-videoconferencing edition! Contact: Henry Neeman (hneeman@ou.edu)...</Summary>
<Website>http://symposium2020.oscer.ou.edu/</Website>
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<PostedAt>Thu, 10 Sep 2020 08:54:11 -0400</PostedAt>
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<NewsItem contentIssues="true" id="95589" important="false" status="posted" url="https://beta.my.umbc.edu/groups/hpcf/posts/95589">
<Title>HPCF Update</Title>
<Tagline>Request for publications</Tagline>
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<![CDATA[
    <div class="html-content"><div>Dear Researchers, Colleagues, and Students,</div><div><br></div><div>This is my regular reminder, coming from the HPCF Governance Committee as well as from the PI/co-PIs of the NSF MRI grant that funded a lot of the nodes of HPCF, that you please send me citations for all publications that used HPCF resources!</div><div><br></div><div>We want to post them to the HPCF webpage, see hpcf.umbc.edu/publications, for NSF reporting, but even more importantly in some ways, we want to impress on the UMBC administration how vital HPCF is to so many researchers and students doing their research.</div><div><br></div><div>To this end, please also particularly send me information on student theses (senior/undergraduate, MS, PhD)! Feel free to go back a year in checking if we have the information. If in doubt, send again.</div><div><br></div><div>Also update previously reported submissions, if they have been accepted or appeared now. You can always search the publications page for your own name to see what information we have. Also let me know any mistakes we might have (typos, etc.)</div><div><br></div><div>Matthias Gobbert</div><div>Department of Mathematics and Statistics</div><div>Chair Governance Committee and PI MRI grant</div><div><br></div></div>
]]>
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<Summary>Dear Researchers, Colleagues, and Students,     This is my regular reminder, coming from the HPCF Governance Committee as well as from the PI/co-PIs of the NSF MRI grant that funded a lot of the...</Summary>
<Website>https://hpcf.umbc.edu/</Website>
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<NewsItem contentIssues="true" id="94622" important="false" status="posted" url="https://beta.my.umbc.edu/groups/hpcf/posts/94622">
<Title>Mothur is now Installed on Taki</Title>
<Tagline>New Bioinformatics Software is available</Tagline>
<Body>
<![CDATA[
    <div class="html-content">We have installed the Mothur software on the Taki cluster. Documentation on the software is available <a href="https://mothur.org/wiki/mothur_manual/" rel="nofollow external" class="bo">here</a>. This is available as a module on Taki.<div><br></div><div><br></div></div>
]]>
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<Summary>We have installed the Mothur software on the Taki cluster. Documentation on the software is available here. This is available as a module on Taki.</Summary>
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<PostedAt>Mon, 03 Aug 2020 17:13:07 -0400</PostedAt>
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<NewsItem contentIssues="false" id="88762" important="false" status="posted" url="https://beta.my.umbc.edu/groups/hpcf/posts/88762">
<Title>Slurm Slow to Respond on Taki</Title>
<Body>
<![CDATA[
    <div class="html-content">Good morning,<div><br></div><div>We are aware that slurm commands such as squeue and sacct are running slowly or even timing-out this morning. We are investigating the issue. Slurm documentation seems to indicate that this may be due to a large number of concurrent jobs in addition to frequent queries to the slurm database. </div><div><br></div><div>Running jobs seem to be unaffected by this issue. Though some may need to be cancelled to resolve the apparent load on slurm.</div><div><br></div><div>I will follow up by editing this post with the resolution.</div><div><br></div><div>----------------------</div><div>Update #1</div><div><br></div><div>I can confirm that the issue is a high number of jobs (near 50K, total) pending in the slurm queue. This generated a high load for the database when queries were made such that the remote calls over the network (from any node to the management node) timed-out before they could be completed. </div><div><br></div><div><div>----------------------</div><div> Update #2</div></div><div><br></div><div>By increasing the time the network considers for a 'time-out' I was able to finally gather information from the slurm database and administratively cancel a few tens of thousands of jobs. I am working now with slurm support to determine the best way to limit the total number of jobs on the queue. This will mean that future sbatch submissions will generate errors when attempting to submit a number of jobs that would put the slurm queue above the limit. This is preferable to squeue being unavailable to all users due to high load.</div><div><br></div><div><br></div><div>Happy Monday!</div><div>Roy Prouty</div><div><br></div><div><div>HPC System Administrator</div><div>Research Computing Specialist, UMBC DoIT</div><div>Office: (410) 455-6351</div></div></div>
]]>
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<Summary>Good morning,    We are aware that slurm commands such as squeue and sacct are running slowly or even timing-out this morning. We are investigating the issue. Slurm documentation seems to indicate...</Summary>
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<PostedAt>Mon, 25 Nov 2019 08:12:05 -0500</PostedAt>
<EditAt>Thu, 06 Aug 2020 13:47:39 -0400</EditAt>
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<NewsItem contentIssues="false" id="88408" important="true" status="posted" url="https://beta.my.umbc.edu/groups/hpcf/posts/88408">
<Title>Reboot of taki-usr1</Title>
<Body>
<![CDATA[
    <div class="html-content">Good morning!<div><br></div><div>Due to memory consumption on the taki login node, `taki-usr1`, we are rebooting the node to clear associated errors.</div><div><br></div><div>When free memory on one of our machines drops below a certain threshold, a special system process starts to kill processes based on a set of industry-set heuristics. The demise of these processes could lead to unexpected machine behavior, necessitating a reboot of the machine.</div><div><br></div><div>I'd like to take this opportunity to remind all taki users that the login node is used by all taki users. This node should be used to access files, write and compile code, and submit jobs to the slurm scheduler. Tests of code or workflows should be delegated to the develop partition. More information on how to use these nodes is located on the HPCF Website (<a href="https://hpcf.umbc.edu/cpu/how-to-run-programs-on-taki/" rel="nofollow external" class="bo">https://hpcf.umbc.edu/cpu/how-to-run-programs-on-taki/</a><span>).</span></div><div><span><br></span></div><div><span><br></span></div><div>---------------------</div><div><span>Update #1:</span></div><div><span><br></span></div><div><span>Choosing to look at `squeue` as an indicator on this issue. Squeue is now responding but with an added me</span>ssage that "MessageTimeout is too high for effective fault-tolerance". This is expected. I increased the MessageTimeout configuration parameter in an attempt to give more time for the slurm database to respond. This seems to be working, but it leaving us with an authentication issue. </div><div><br></div><div>Looking at the output of squeue, there are many tens of thousands of similar jobs being run by some users. I am cancelling these and will follow-up with the users and PIs (where necessary). I will also discuss with our slurm support how to configure slurm to avoid this situation in the future.</div><div><br></div><div>---------------------</div>
    
    
    
    
    
    
    
    <div><span><br></span></div><div><span>Thanks!</span></div><div><span>Roy Prouty</span></div><div><span><br></span></div><div>HPC System Administrator</div><div>Research Computing Specialist, UMBC DoIT</div><div>Office: <span>(410) 455-6351</span></div></div>
]]>
</Body>
<Summary>Good morning!    Due to memory consumption on the taki login node, `taki-usr1`, we are rebooting the node to clear associated errors.     When free memory on one of our machines drops below a...</Summary>
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<PostedAt>Wed, 13 Nov 2019 09:32:49 -0500</PostedAt>
<EditAt>Mon, 25 Nov 2019 08:28:18 -0500</EditAt>
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<NewsItem contentIssues="false" id="87913" important="false" status="posted" url="https://beta.my.umbc.edu/groups/hpcf/posts/87913">
<Title>Intel Compilers Updated</Title>
<Tagline>We have the latest Intel compilers now available on Taki</Tagline>
<Body>
<![CDATA[
    <div class="html-content">The Intel compilers have been updated to the latest version. You may notice a message during login about a change. Just follow the instructions you get at login, and this should resolve these messages.</div>
]]>
</Body>
<Summary>The Intel compilers have been updated to the latest version. You may notice a message during login about a change. Just follow the instructions you get at login, and this should resolve these...</Summary>
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<PostedAt>Fri, 25 Oct 2019 11:00:38 -0400</PostedAt>
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<NewsItem contentIssues="false" id="86990" important="false" status="posted" url="https://beta.my.umbc.edu/groups/hpcf/posts/86990">
<Title>Taki back online (9/24/2019 12:10pm)</Title>
<Body>
<![CDATA[
    <div class="html-content">Hello all.<br><br>Thank you for your patience while we sorted through the issues with Taki.  We believe the cluster is now back online and working normally.  The source of the issue was with bad connectivity on the Infiniband network. We've been able to narrow down and replace the bad line that prevented use of various nodes and storage.<div><br></div><div>If you notice any issues moving forward, please do let us know.  We will be keeping a close eye on the cluster and jobs to ensure the problem does not again crop up.  <br><br>Tim Champ</div><div>Manager of Unix Infrastructure</div><div>DoIT</div></div>
]]>
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<Summary>Hello all.  Thank you for your patience while we sorted through the issues with Taki.  We believe the cluster is now back online and working normally.  The source of the issue was with bad...</Summary>
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<PostedAt>Tue, 24 Sep 2019 12:11:20 -0400</PostedAt>
<EditAt>Thu, 06 Aug 2020 13:47:18 -0400</EditAt>
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<NewsItem contentIssues="false" id="86972" important="true" status="posted" url="https://beta.my.umbc.edu/groups/hpcf/posts/86972">
<Title>Taki update (09/23/2019 7:30pm)</Title>
<Body>
<![CDATA[
    <div class="html-content">Hello all.<br><br>We are continuing to work on sorting out the issues with networking on taki.  We believe we're having hardware issue with the infiniband switch and are working on solutions.  <div><br></div><div>As of now, we aren't sure that taki will be back online tonight, but we will send another update if we do get it back online tonight.  If not, we plan to update tomorrow as we continue to work toward a solution.</div><div><br>Thank you for your patience, and we do apologize for the inconvenience this is causing.  <br><br>Tim </div></div>
]]>
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<Summary>Hello all.  We are continuing to work on sorting out the issues with networking on taki.  We believe we're having hardware issue with the infiniband switch and are working on solutions.      As of...</Summary>
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