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<p>You shouldn't have to change any parameters if you have it
configured in the defaults. Just systemctl stop/start slurmd as
needed.</p>
<p><br>
</p>
<p>something like:</p>
<p>scontrol update state=drain nodename=<node_to_change>
reason="MIG reconfig"</p>
<p><wait for it to be drained></p>
<p>ssh <node_to_change> "systemctl stop slurmd"</p>
<p><run reconfig stuff></p>
<p>ssh <node_to_change> "systemctl start slurmd"</p>
<p><br>
</p>
<p></p>
<p>Not sure what would make you feel slurmd cannot run as a service
on a dynamic node. As long as you added the options to the systemd
defaults file for it, you should be fine (usually
/etc/defaults/slurmd)<br>
</p>
<p><br>
</p>
<p>Brian<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 9/23/2022 7:40 AM, Groner, Rob
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:BL0PR02MB449998D4369EBD2D924608AD80519@BL0PR02MB4499.namprd02.prod.outlook.com">
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<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255,
255, 255);" class="elementToProof">
Ya, we're still working out the mechanism for taking the node
out, making the changes, and bringing it back. But the part I
can't figure out is slurmd running on the remote node. What do
I do with it? Do I run it standalone, and when I need to
reconfigure, I kill -9 it and execute it again with the new
configuration? Or what if slurmd is running as a service (as it
does on all our non-dynamic nodes)? Do I stop it, change its
service parameters and then restart it to reconfigure the node?
The docs on slurm for dynamic nodes don't give any indication of
how you handle slurmd running on the dynamic node. What is the
preferred method? </div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255,
255, 255);" class="elementToProof">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255,
255, 255);" class="elementToProof">
Rob</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255,
255, 255);" class="elementToProof">
<br>
</div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt"
face="Calibri, sans-serif" color="#000000"><b>From:</b>
slurm-users <a class="moz-txt-link-rfc2396E" href="mailto:slurm-users-bounces@lists.schedmd.com"><slurm-users-bounces@lists.schedmd.com></a> on
behalf of Brian Andrus <a class="moz-txt-link-rfc2396E" href="mailto:toomuchit@gmail.com"><toomuchit@gmail.com></a><br>
<b>Sent:</b> Friday, September 23, 2022 10:24 AM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:slurm-users@lists.schedmd.com">slurm-users@lists.schedmd.com</a>
<a class="moz-txt-link-rfc2396E" href="mailto:slurm-users@lists.schedmd.com"><slurm-users@lists.schedmd.com></a><br>
<b>Subject:</b> Re: [slurm-users] slurmd and dynamic nodes</font>
<div> </div>
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<p><br>
</p>
<p>Just off the top of my head here.</p>
<p>I would expect you need to have no jobs currently running
on the node, so you could could submit a job to the node
that sets the node to drain, does any local things needed,
then exits. As part of the EpilogSlurmctld script, you could
check for drained nodes based on some reason (like 'MIG
reconfig') and do the head node steps there, with a final
bit of bringing it back online.
<br>
</p>
<p><br>
</p>
<p>Or just do all those steps from a script outside slurm
itself, on the head node. You can use ssh/pdsh to connect to
a node and execute things there while it is out of the mix.<br>
</p>
<p><br>
</p>
<p>Brian Andrus<br>
</p>
<p><br>
</p>
<div class="x_moz-cite-prefix">On 9/23/2022 7:09 AM, Groner,
Rob wrote:<br>
</div>
<blockquote type="cite">
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<br>
</div>
<div dir="ltr">
<div class="x_x_elementToProof"
style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0);
background-color:rgb(255,255,255)">
I'm working through how to use the new dynamic node
features in order to take down a particular node,
reconfigure it <span class="x_x_ContentPasted0"
style="color:rgb(0,0,0);
background-color:rgb(255,255,255);
display:inline!important">(using nvidia MIG to change
the number of graphic cores available)</span> and give
it back to slurm.</div>
<div class="x_x_elementToProof"
style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0);
background-color:rgb(255,255,255)">
<br>
</div>
<div class="x_x_elementToProof"
style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0);
background-color:rgb(255,255,255)">
I'm at the point where I can take a node out of slurm's
control from the master node (scontrol delete
nodename....), make the nvidia-smi change, and then
execute slurmd on the node with the changed
configuration parameters. It then does show up again in
the sinfo output on the master node, with the correct
new resources.</div>
<div class="x_x_elementToProof"
style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0);
background-color:rgb(255,255,255)">
<br>
</div>
<div class="x_x_elementToProof"
style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0);
background-color:rgb(255,255,255)">
What I'm not sure about is...when I want to reconfigure
the <span class="x_x_ContentPasted1"
style="color:rgb(0,0,0);
background-color:rgb(255,255,255);
display:inline!important">
dynamic </span>node AGAIN, how do I do that on the
target node? I can use "scontrol delete" again on the
scheduler node, but on the
<span style="color:rgb(0,0,0);
background-color:rgb(255,255,255);
display:inline!important">
dynamic</span> node, slurmd will still be running.
Currently, for testing purposes, I just find the process
ID and kill -9 it. Then I change the node configuration
and execute "slurmd -Z --conf=...." again. </div>
<div class="x_x_elementToProof"
style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0);
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<br>
</div>
<div class="x_x_elementToProof"
style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0);
background-color:rgb(255,255,255)">
Is there a more elegant way to change the configuration
on the <span style="color:rgb(0,0,0);
background-color:rgb(255,255,255);
display:inline!important">
dynamic</span> node than by killing the existing
slurmd process and starting it again? </div>
<div class="x_x_elementToProof"
style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0);
background-color:rgb(255,255,255)">
<br>
</div>
<div class="x_x_elementToProof"
style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0);
background-color:rgb(255,255,255)">
I'll note that I tried doing everything from the master
(slurmctld) node, since there is an option of creating
the node there with "scontrol create" instead of using
slurmd on the dynamic node. But when i tried that, the
dynamic node I created showed up in sinfo output with a
~ next to it (powered off). The dynamic node docs page
online did not mention what, if anything, slurmd was
supposed to be running as on the dynamic node if
attempting to handle delete and create only on the
master node. </div>
<div class="x_x_elementToProof"
style="font-family:Calibri,Arial,Helvetica,sans-serif;
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<br>
</div>
<div class="x_x_elementToProof"
style="font-family:Calibri,Arial,Helvetica,sans-serif;
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Thanks.</div>
<div class="x_x_elementToProof"
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<br>
</div>
<div class="x_x_elementToProof"
style="font-family:Calibri,Arial,Helvetica,sans-serif;
font-size:12pt; color:rgb(0,0,0);
background-color:rgb(255,255,255)">
Rob</div>
<div class="x_x_elementToProof"
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<br>
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