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Using SRUN to Submit Jobs

Note

Usually, if you have to run a single application multiple times, or if you are trying to run a non-interactive application, you should use sbatch instead of srun, since sbatch allows you to specify parameters in the file, and is non-blocking (see below).

SRUN is a so-called blocking command, as in it will not let you execute other commands until this command is finished (not necessarily the job, just the allocation). For example, if you run srun /bin/hostname and resources are available right away, the job will be sent out and the result saved into a file. If resources are not available, you will be stuck in the command while you are pending in the queue.

Please note that like sbatch, you can run a batch file using srun.

The command syntax is srun <options> [executable] <args>

Options is where you can specify the resources you want for the executable, or define. The following are some of the options available; to see all available parameters run man srun.

  • -c <num> Number of CPUs (threads) to allocate to the job per task
  • -n <num> The number of tasks to allocate (for MPI)
  • -G <num> Number of GPUs to allocate to the job
  • --mem <num>[K|M|G|T] Memory to allocate to the job (in MB by default)
  • -p <partition> Partition to submit the job to

To run an interacitve job (in this case a bash prompt), the command might look like this (--pty is the important option):

srun -c 6 -p cpu --pty bash

To run an application on the cluster that uses a GUI, you must use an interactive job, in addition to the --x11 argument:

srun -c 6 -p cpu --pty --x11 xclock

Note

You cannot run an interactive/gui job using the sbatch command, you must use srun.