By Robert Stober | November 20, 2012 | workload manager, HPC job scheduler, Slurm
Here is an easy way to submit an interactive job to Slurm, using srun. You can even submit a job to a cloud node this way.
Let's get started.
Here are some common examples of srun usage.
$ srun sleep 30
srun: Job step created
The job was submitted but where is it running? Use the scontrol command to get detailed job output. First use squeue to get the jobid.
$ squeue
JOBID PARTITION NAME USER ST TIME NODES NODELIST(REASON)
1877 defq sleep rstober R 0:06 1 atom01
The squeue output shows that the job id is 1877. The scontrol output shows detailed job output. For example the NodeList parameters shows that the job is running on the host "atom01".
$ scontrol show job 1877
JobId=1877 Name=sleep
UserId=rstober(1001) GroupId=rstober(1001)
Priority=4294901754 Account=(null) QOS=normal
JobState=RUNNING Reason=None Dependency=(null)
Requeue=1 Restarts=0 BatchFlag=0 ExitCode=0:0
RunTime=00:00:15 TimeLimit=UNLIMITED TimeMin=N/A
SubmitTime=2012-06-28T16:52:10 EligibleTime=2012-06-28T16:52:10
StartTime=2012-06-28T16:52:10 EndTime=Unknown
PreemptTime=None SuspendTime=None SecsPreSuspend=0
Partition=defq AllocNode:Sid=atom-head1:8298
ReqNodeList=(null) ExcNodeList=(null)
NodeList=atom01
BatchHost=atom01
NumNodes=1 NumCPUs=2 CPUs/Task=1 ReqS:C:T=*:*:*
MinCPUsNode=1 MinMemoryNode=0 MinTmpDiskNode=0
Features=(null) Gres=(null) Reservation=(null)
Shared=0 Contiguous=0 Licenses=(null) Network=(null)
Command=/bin/sleep
WorkDir=/home/rstober
Let's specify the cloud partition this time. This job will run on a cloud node.
$ srun -p cloud sleep 30
srun: Job step created
To direct the job output to a file specify the -o filename option. This job will execute the hostname command, and SLURM will save the jobs STDOUT and STDERR in the file "hostname.out" in the current directory
$ srun -p defq -o hostname.out hostname
srun: Job step created
The contents of the hostname.out file show that this job also ran on atom01
$ cat hostname.out
atom01
