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** Memory shortage can cause the kernel to kill processes ("OOM kill"), which results in the same message but affects exit status differently. | ** Memory shortage can cause the kernel to kill processes ("OOM kill"), which results in the same message but affects exit status differently. | ||
** A job that reports DerivedExitStatus 0:125 indicates hitting the memory limit, but not being OOM-killed. | ** A job that reports DerivedExitStatus 0:125 indicates hitting the memory limit, but not being OOM-killed. | ||
** In the absence of any other action, a step with 0:125 will *not* enable a job which has afterok dependency. This is a Slurm bug that will be [https://bugs.schedmd.com/show_bug.cgi?id=3820 fixed in 17.11.3], so that Slurm can distinguish between the warning condition versus actual kernel OOM-kill events. Slurm will continue to limit memory usage from cgroups, so I/O memory will still be counted and be reported when exceeds the job's requested memory. | ** In the absence of any other action, a step with 0:125 will *not* enable a job which has afterok dependency. This is a Slurm bug that will be [https://bugs.schedmd.com/show_bug.cgi?id=3820 fixed in 17.11.3], so that Slurm can distinguish between the warning condition versus actual kernel OOM-kill events. Slurm will continue to limit memory usage from cgroups, so I/O memory will still be counted and be reported when it exceeds the job's requested memory. | ||
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* The CC Slurm configuration encourages whole-node jobs. When appropriate, users should request whole-node rather than per-core resources. | * The CC Slurm configuration encourages whole-node jobs. When appropriate, users should request whole-node rather than per-core resources. Read about [[Job_scheduling_policies#Whole_nodes_versus_cores|whole node scheduling]]. | ||
* By default, the job receives environment settings from the submitting shell. This can lead to irreproducible results if it's not what you expect. To force the job to run with a fresh-like login environment, you can submit with <tt>--export=none</tt> or add <tt>#SBATCH --export=NONE</tt> to your job script. | * By default, the job receives environment settings from the submitting shell. This can lead to irreproducible results if it's not what you expect. To force the job to run with a fresh-like login environment, you can submit with <tt>--export=none</tt> or add <tt>#SBATCH --export=NONE</tt> to your job script. | ||