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--- slurm [2023/04/05 13:39]
vodrazka [gpu-ms]
+++ slurm [2024/10/02 15:22] (current)
popel
@@ Line 1: / Line 1: @@
 ====== ÚFAL Grid Engine (LRC) ======
+**IN 2024: Newly, all the documentation is at a dedicated wiki https://ufal.mff.cuni.cz/lrc (you need to use ufal and [[internal:welcome-at-ufal#small-linguistic-password|small-linguistic password]] to access the wiki from outside of the UFAL network).***
 LRC (Linguistic Research Cluster) is the name of ÚFAL's computational grid/cluster. The cluster is built on top of [[https://slurm.schedmd.com/|SLURM]] and is using [[https://www.lustre.org/|Lustre]] for [[internal:linux-network#directory-structure|data storage]].
-See Milan Straka's intro to Slurm (and Spark if you want):
+See Milan Straka's intro to Slurm (and Spark and possibly also the [[https://ufal.mff.cuni.cz/courses/npfl118#assignments|NPFL118 assingments]] if you want). Use the username=ufal and small linguistic password:
-  * https://lectures.ms.mff.cuni.cz/video/rec/npfl118/2223/npfl118-2223-winter-slurm.mp4
+  * https://lectures.ms.mff.cuni.cz/video/rec/npfl118/2324/npfl118-2324-winter-slurm.mp4
-  * https://lectures.ms.mff.cuni.cz/video/rec/npfl118/2223/npfl118-2223-winter-spark.mp4
+  * https://lectures.ms.mff.cuni.cz/video/rec/npfl118/2324/npfl118-2324-winter-spark.mp4
+  * https://lectures.ms.mff.cuni.cz/video/rec/npfl118/2324/npfl118-2324-winter-assignments.mp4
 Currently there are following partitions (queues) available for computing:
@@ Line 125: / Line 128: @@
 </code>
-==== Running jobs ====
+==== Inspecting jobs ====
 In order to inspect all running jobs on the cluster use:
@@ Line 131: / Line 134: @@
 <code>
 squeue
+</code>
+filter only my jobs
+<code>
+squeue --me
 </code>
@@ Line 206: / Line 215: @@
 In the example above you can see comments at all lines relevant to CPU allocation.
+=== Priority ====
+When running srun or sbatch, you can pass ''-q high/normal/low/preempt-low''. These represent priorities 300/200/100/100, with ''normal'' (200) being the default. Furthermore, the ''preempt-low'' QOS is actually preemptible -- if there is a job with normal or high QOS, they can interrupt your ''preempt-low'' job.
+The preemption has probably not been used by anyone yet; some documentation about it is on https://slurm.schedmd.com/preempt.html, we use the REQUEUE regime (so your job is killed, very likely with some signal, so you could monitor it and for example save a checkpoint; but currently I do not know any details), and then started again when there are resources.
 ==== Interactive mode ====
@@ Line 238: / Line 250: @@
   * ''-''''-constraint="gpuram48G|gpuram40G"'' only consider nodes that have either ''gpuram48G'' or ''gpuram40G'' feature defined
+\\
+**Unexpected Behavior of ''srun -c1''**
+When you execute a command using ''srun'' and pass ''-c1'' like
+<code>srun -c1 date</code>
+then the command is actually executed **twice in parallel**. To avoid it, you have to either **remove the ''-c1''** or also **add explicit ''-n1''.**
 ==== Delete Job ====
 <code>scancel <job_id> </code>
+<code>scancel -n <job_name> </code>
 To see all the available options type:
-<code>man srun</code>
+<code>man scancel</code>
 ==== Basic commands on cluster machines ====

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