computing

h1. Introduction to Condor for users

Condor is a job submission system that creates a high throughput computing environments.

h2. Getting started

After gaining ssh accesh to a condor frontend, a user can see what resources are available by running

<code>
condor_status
</code>

and check the status of the queue by running

<code>
condor_q
</code>

In order to submit jobs, one needs to create a submit script that defines the requirements and a few options. A simple example to get started would be

h3. Example job submission script helloworld.submit

<code>
executable = helloworld.sh
universe = vanilla

should_transfer_files = YES
when_to_transfer_output = ON_EXIT
stream_output = true

transfer_input_files = helloworld.dat

request_cpus = 1
request_memory = 8000

requirements = (target.Arch == "X86_64")

input = /dev/null
output = out
error = error
log = log

queue
</code>

h3. Example additional file helloworld.dat

<code>
Hello World!
</code>

h3. Example executable script helloworld.sh

<code>
#!/bin/bash
echo "----------------------"
hostname
echo "----------------------"
date
echo "----------------------"
echo "Sleeping 20s"
sleep 20
echo "----------------------"
cat helloworld.dat
</code>

After creating these 3 files, the job would be submitted by running

condor_submit helloworld.submit

h2. Checking status

To see details about the status of each job in the queue, one would run

<code>
condor_q -b
</code>

When a job is running, it is also possible to access the node it is using, by identifying the jobid with condor_q and then running

<code>
condor_ssh_to_job jobid
</code>

h2. More Information

http://research.cs.wisc.edu/condor/manual/v7.4/ref.html