A quick guide to HTCondor
Basic commands
Firstly, some basic HTCondor commands are as follows. To submit a job, type:
condor_submit <file>
To list your running and idle jobs, type:
condor_q
To list completed jobs, type:
condor_history
Job submission
Create a file called simplejob.sub
containing:
cmd=script.sh arguments=10 output=job.$(cluster).$(process).out error=job.$(cluster).$(process).err log=job.$(cluster).$(process).log should_transfer_files = YES when_to_transfer_output = ON_EXIT RequestMemory=100 queue
and a script called script.sh
containing:
#!/bin/sh sleep $1 hostname
Make sure it's executable:
chmod 755 script.sh
Submit the job:
-bash-4.1$ condor_submit simplejob.sub Submitting job(s). 1 job(s) submitted to cluster 91959.
Checking the status of the job:
-bash-4.1$ condor_q -- Schedd: lcgui03.gridpp.rl.ac.uk : <130.246.180.41:33754?... ID OWNER SUBMITTED RUN_TIME ST PRI SIZE CMD 91959.0 alahiff 2/26 13:08 0+00:00:07 R 0 0.0 script.sh 10 1 jobs; 0 completed, 0 removed, 0 idle, 1 running, 0 held, 0 suspended
The job will:
- run the script "script.sh" with argument "10"
- 100 MB of memory will be requested
- the executable (script.sh in this case) will be automatically transferred to the worker nodes
- stdout from the job will end up in the file job.91959.0.out (once it completes)
- stderr from the job will end up in the file job.91959.0.err (once it completes)
- the log file job.91959.0.log will give some information about the status of the job
Checking the status:
Once the job is completed
-bash-4.1$ ls -lt *91959* -rw-r--r-- 1 alahiff esc 1032 Feb 26 13:09 job.91959.0.log -rw-r--r-- 1 alahiff esc 24 Feb 26 13:09 job.91959.0.out -rw-r--r-- 1 alahiff esc 0 Feb 26 13:08 job.91959.0.err
Note that with this example job description file, all files generated by the job will be automatically transferred back to the machine where you submitted the job (i.e. lcgui03 or lcgui04). You can prevent this from happening by adding:
+TransferOutput=""
If the job needs additional files, you can add a line something like this:
transfer_input_files = input1.dat,input2.dat
and they will be copied.
The official documentation is here:
http://research.cs.wisc.edu/htcondor/manual/v8.4/index.html
Regards, Andrew.