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--- reserve [2022/08/30 09:44] – mimbert
+++ reserve [2022/08/30 10:39] – mimbert
@@ Line 67: / Line 67: @@
 This is useful in particular if you want to go physically in the room for experimenting with specific hardware, because it avoids waking any node if they are in energy saving mode.
+==== A note on OAR job scheduling ====
+Be aware that OAR behaviour may sometimes be counter-intuitive: You may think that just because you ran oarsub successfuly and it returns a job id, your job is running, but this assumption is wrong: OAR tells you that it accepts your job submission but it may schedule it later for various reasons:
+  * because the nodes are currently shutdown, so it needs to wake them up, which may take some time
+  * because another job is running
+  * because the resources you ask are currently not available but oar expects them to be available in the future
+  * etc.
+So, the only reliable way to be sure that your job is actually running is to check that the job's state is "Running" with command:
+<code>oarstat -fj <JOBID></code>
+Tasks submitted to minus will never start unless the job is "Running" anyway.
 ==== A note on energy saving ====