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<p>I just set this up a couple of weeks ago myself. Creating two
partitions is definitely the way to go. I created one partition,
"general" for normal, general-access jobs, and another,
"interruptible" for general-access jobs that can be interrupted,
and then set PriorityTier accordingly in my slurm.conf file (Node
names omitted for clarity/brevity). <br>
</p>
<p>PartitionName=general Nodes=... MaxTime=48:00:00 State=Up
PriorityTier=10 QOS=general<br>
PartitionName=interruptible Nodes=... MaxTime=48:00:00 State=Up
PriorityTier=1 QOS=interruptible</p>
<p>I then set PreemptMode=Requeue, because I'd rather have jobs
requeued than suspended. And it's been working great. There are
few other settings I had to change. The best documentation for all
the settings you need to change is
<a class="moz-txt-link-freetext" href="https://slurm.schedmd.com/preempt.html">https://slurm.schedmd.com/preempt.html</a></p>
<p>Everything has been working exactly as desired and advertised. My
users who needed the ability to run low-priority, long-running
jobs are very happy. <br>
</p>
<p>The one caveat is that jobs that will be killed and requeued need
to support checkpoint/restart. So when this becomes a production
thing, users are going to have to acknowledge that they will only
use this partition for jobs that have some sort of
checkpoint/restart capability. <br>
</p>
<pre class="moz-signature" cols="72">Prentice </pre>
<div class="moz-cite-prefix">On 2/15/19 11:56 AM, david baker wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAGFmSwEemXQCeOV=UDaCYJ6Qvf6DKQxfqJ+6=5YphmKih1GejQ@mail.gmail.com">
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<div dir="ltr">Hi Paul, Marcus,
<div><br>
</div>
<div>Thank you for your replies. Using partition priority all
makes sense. I was thinking of doing something similar with a
set of nodes purchased by another group. That is, having a
private high priority partition and a lower priority
"scavenger" partition for the public. In this case scavenger
jobs will get killed when preempted. </div>
<div><br>
</div>
<div>In the present case , I did wonder if it would be possible
to do something with just a single partition -- hence my
question.Your replies have convinced me that two partitions
will work -- with preemption leading to re-queued jobs. </div>
<div><br>
</div>
<div>Best regards,</div>
<div>David </div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, Feb 15, 2019 at 3:09
PM Paul Edmon <<a href="mailto:pedmon@cfa.harvard.edu"
moz-do-not-send="true">pedmon@cfa.harvard.edu</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p>Yup, PriorityTier is what we use to do exactly that
here. That said unless you turn on preemption jobs may
still pend if there is no space. We run with REQUEUE on
which has worked well.</p>
<p><br>
</p>
<p>-Paul Edmon-</p>
<p><br>
</p>
<div class="gmail-m_8153567423438616633moz-cite-prefix">On
2/15/19 7:19 AM, Marcus Wagner wrote:<br>
</div>
<blockquote type="cite"> Hi David,<br>
<br>
as far as I know, you can use the PriorityTier (partition
parameter) to achieve this. According to the manpages (if
I remember right) jobs from higher priority tier
partitions have precedence over jobs from lower priority
tier partitions, without taking the normal fairshare
priority into consideration.<br>
<br>
Best<br>
Marcus<br>
<br>
<div class="gmail-m_8153567423438616633moz-cite-prefix">On
2/15/19 10:07 AM, David Baker wrote:<br>
</div>
<blockquote type="cite">
<div
id="gmail-m_8153567423438616633divtagdefaultwrapper"
dir="ltr">
<p style="margin-top:0px;margin-bottom:0px">Hello.</p>
<p style="margin-top:0px;margin-bottom:0px"><br>
</p>
<p style="margin-top:0px;margin-bottom:0px">We have a
small set of compute nodes owned by a group. The
group has agreed that the rest of the HPC community
can use these nodes providing that they (the owners)
can always have priority access to the nodes. The
four nodes are well provisioned (1 TByte memory each
plus 2 GRID K2 graphics cards) and so there is no
need to worry about preemption. In fact I'm happy
for the nodes to be used as well as possible by all
users. It's just that jobs from the owners must take
priority if resources are scarce. </p>
<p style="margin-top:0px;margin-bottom:0px"><br>
</p>
<p style="margin-top:0px;margin-bottom:0px">What is
the best way to achieve the above in slurm? I'm
planning to place the nodes in their own partition.
The node owners will have priority access to the
nodes in that partition, but will have no advantage
when submitting jobs to the public resources. Does
anyone please have any ideas how to deal with this?</p>
<p style="margin-top:0px;margin-bottom:0px"><br>
</p>
<p style="margin-top:0px;margin-bottom:0px">Best
regards,</p>
<p style="margin-top:0px;margin-bottom:0px">David</p>
<p style="margin-top:0px;margin-bottom:0px"><br>
</p>
</div>
</blockquote>
<br>
<pre class="gmail-m_8153567423438616633moz-signature" cols="72">--
Marcus Wagner, Dipl.-Inf.
IT Center
Abteilung: Systeme und Betrieb
RWTH Aachen University
Seffenter Weg 23
52074 Aachen
Tel: +49 241 80-24383
Fax: +49 241 80-624383
<a class="gmail-m_8153567423438616633moz-txt-link-abbreviated" href="mailto:wagner@itc.rwth-aachen.de" target="_blank" moz-do-not-send="true">wagner@itc.rwth-aachen.de</a>
<a class="gmail-m_8153567423438616633moz-txt-link-abbreviated" href="http://www.itc.rwth-aachen.de" target="_blank" moz-do-not-send="true">www.itc.rwth-aachen.de</a>
</pre>
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