Job Interactive

Interactive Jobs

More info

Interactive job sessions can be used on Talon if you need to compile or test software. An example command of starting an interactive sessions is shown below:

 $ srun -p public --qos general -N 1  --pty bash
 

This launches an interactive job session and lanches a bash shell to a compute node. From there, you can execute software and shell commands that would otherwise not be allowed on the Talon login nodes.

You can use same Slurm Commands:

• Defines the partition which may be used to execute this job (Always keep public).

  -p public

• Defines the job name - it can be any name you want

 -J job_name

• Defines the output file name. %j will add the JOBID to the output_name.o file

  -o output_name.o%j

• Defines the error file name. %j will add the JOBID to the error_name.o file

 -e error_name.e%j

• Defines the Quality of Service (QOS) the job will be executed. Options to use: (debug, general, large)

  • debug - 2 hour and 2 node limit with high priority
  • general - 72 hour and 560 CPU cores limit with default partition
  • large - limit to 20 nodes, unlimited hours, allow exclusive jobs and low priority

     --qos general

• Defines the total number CPU cores:

 -n 84

• Defines the number of compute nodes requested:

 -N 3

• Defines the number of tasks per node:

 --ntasks-per-node 28

• Requests the c6320 compute nodes. (Also can request r420, r720, and r730 compute nodes). More Info

 -C c6320

• Sets up email notification.

 [email protected]

• Email user when:

  • node gets allocated begins:

   --mail-type=begin
  

  • node gets released finishes:

   --mail-type=end
  

  • or both:

  --mail-type=ALL
  

• Use GPUs.

--gres=gpu: NUM_GPUS

Login to your node:

Find out your node name:

 $ squeue -u euid123

$NODE_NAME can be seen under NODELIST column

To login your node:

 slogin $NODE_NAME

Get job details:

Find out your job id:

 $ squeue -u euid123

$JOB_ID can be seen under JOBID column

 $ scontrol show job $JOB_ID

Kill a job. Users can kill their own jobs, root can kill any job.

 $ scancel $JOB_ID

Hold a job:

 $ scontrol hold $JOB_ID

Release a job:

 $ scontrol release $JOB_ID

Example of requesting 1 node with email notificaiton:

 $ srun -p public --qos general [email protected] --mail-type=ALL -N 1 --pty bash

This is very useful because it notifies you when your node has been allocated to you so you can start work!