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<p>Is there a reason to run them as a single job?</p>
<p>It may be easier to just have 2 separate jobs of 16 cores each.</p>
<p>If there are dependency requirements, that is addressed by adding
any dependencies to the job submission.</p>
<p>Brian Andrus<br>
</p>
<div class="moz-cite-prefix">On 7/25/2020 2:50 AM, Даниил Вахрамеев
wrote:<br>
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<p>I have SLURM cluster with several nodes with 16 vcpus per
node. I've tried to run the following code:</p>
<pre><code>#SBATCH --nodes 2
#SBATCH --ntasks 2
#SBATCH -c 16
srun --exclusive --nodes=1 program1 &
srun --exclusive --nodes=1 program2 &
wait
</code></pre>
<p><code>program1</code> and <code>program2</code> needs
16cpus each and I expected that 2 nodes with 32 cores
would be allocated and <code>program1</code> would be ran
on the first node and <code>program2</code> on the second
one, but I got the following error message:</p>
<pre><code>srun: error: Unable to create step for job 364966: Requested node configuration is not available
</code></pre>
<p>If I use only <code>--nodes</code> and <code>--ntasks</code>
keys, sbatch allocates 2 nodes with 2 cpus and if I use <code>--nodes</code>
and <code>-c</code> options, I get message that <code>--ntasks</code>
should be defined.</p>
<p>If I set <code>--ntasks=1</code>, SLURM set nnodes to 1.</p>
<p>How can I run this two programs in one batch, each on one
node and 16 vcpus?</p>
<p>------</p>
<p>Kind regards,</p>
<p>Daniil Vakhrameev<br>
</p>
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