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<p class="MsoNormal">I’ll second that – we have a cluster with 4 generations of nodes. We assign a processor type feature to each node and require the users to ask for at least one of those features in their jobs via job_submit.lua – see the code below. For
a job that can run on any processor type, you can use this:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">#SBATCH --constraint=[wes|san|has|bro]<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">See the constraint section of “man sbatch” for more details but this will constrain the job to any processor type but all nodes of one type. It really works great from a utilization standpoint – jobs will run on the first processor type
that is free. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:Courier"> local feature_count = 0<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Courier"> if job_desc ~= nil and job_desc.features ~= nil then<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Courier"> if string.match(job_desc.features, "wes") then feature_count=feature_count+1 end<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Courier"> if string.match(job_desc.features, "san") then feature_count=feature_count+1 end<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Courier"> if string.match(job_desc.features, "has") then feature_count=feature_count+1 end<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Courier"> if string.match(job_desc.features, "bro") then feature_count=feature_count+1 end<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Courier"> end<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Courier"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:Courier"> if feature_count > 0 then<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Courier"> slurm.log_info("Found %s valid cpu features",feature_count)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Courier"> else<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Courier"> slurm.log_user("Invalid features - aerolab policy requires specifying one or more of wes,san,has,bro.")<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Courier"> slurm.log_error("Found %s cpu features from %s",feature_count,submit_uid)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Courier"> -- See slurm/slurm_errno.h and src/common/slurm_errno.c<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Courier"> -- for the list of error codes and messages.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Courier"> return 2002<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Courier"> end<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Of course, the user can leave off the square brackets and get any mix of processor types. We have some codes that run fine across different processor types so we allow this. Our group is small enough that we can easily educate and police
the users to do the right thing. But you could add more logic to job_submit.lua to require the brackets if you wanted to.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Darby<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">slurm-users <slurm-users-bounces@lists.schedmd.com> on behalf of Hadrian Djohari <hxd58@case.edu><br>
<b>Reply-To: </b>Slurm User Community List <slurm-users@lists.schedmd.com><br>
<b>Date: </b>Friday, May 11, 2018 at 5:22 AM<br>
<b>To: </b>Slurm User Community List <slurm-users@lists.schedmd.com><br>
<b>Cc: </b>"slurm-users@schedmd.com" <slurm-users@schedmd.com><br>
<b>Subject: </b>Re: [slurm-users] Distribute jobs in similar nodes in the same partition<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">You can use node feature in defining the node types in slurm.conf.
<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Then when requesting for the job, use -C <feature name> toy just use those node type.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Fri, May 11, 2018, 5:38 AM Antonio Lara <<a href="mailto:antonio.lara@uam.es">antonio.lara@uam.es</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Hello everyone,<br>
<br>
Hopefully someone can help me with this, I cannot find in the manual if <br>
this is even possible:<br>
<br>
I'm a system administrator, and the following question is from the <br>
administrator point of view, not the user's point of view:<br>
<br>
I work with a cluster which has a partition containing many nodes. These <br>
nodes belong to "different categories". This is, we bought at once <br>
several machines that are of the same type, and we did this several <br>
times. So, for example, we have 10 machines of type A, 20 machines of <br>
type B and 15 machines of type C. Machines of type A are more powerful <br>
than machines of type B, which are more powerful than machines of type C.<br>
<br>
What I am trying to achieve is that Slurm "forces" parallelized jobs to <br>
be allocated in machines of the same type, if possible. That is, that <br>
there is some type of priority which tries to allocate only machines of <br>
type A, or only machines of type B, or only of type C, and only <br>
distribute jobs among machines of different types when there are not <br>
enough nodes of the same type available.<br>
<br>
Does anyone know if this is possible? The idea behind this is that <br>
slower machines are not delaying the calculations in faster machines <br>
when a job is distributed among them, and all machines work more or less <br>
at the same pace.<br>
<br>
I've been told that It is NOT an option to create different partitions, <br>
each containing only one type of machine.<br>
<br>
Please, note that I'm not looking for a way to choose as a user which <br>
nodes to use for a job, what I need is that slurm does that, and decides <br>
what nodes to use, using similar nodes if available.<br>
<br>
The closest that I could find in the manual was using consumable <br>
resources, but I think this is not what I need, there are several <br>
examples, but they don't seem to fit with this.<br>
<br>
Thank you for your help!<br>
<br>
<o:p></o:p></p>
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