Introductory example - Job Submit API¶
This example will show how to submit a job using the Flux Python bindings.
import os import flux from flux.job import JobspecV1
Here we instantiate a flux handle. This will connect to the running flux instance. If you were running this on a cluster with Flux, you’d likely already be able to connect. If you are testing out on your own, you might need to do flux start –test-size=4
handle = flux.Flux()
This is a new jobspec, or a recipe for a flux job. You’ll notice we are providing a command directly, along with tasks, nodes, and cores per task. You could also provide a script here. If we were doing this on the command line, it would be equivalent to what is generated by: flux submit –ntasks=4 –nodes=2 –cores-per-task=2 sleep 10
jobspec = JobspecV1.from_command( command=["sleep", "10"], num_tasks=4, num_nodes=2, cores_per_task=2 )
This is how we set the “current working directory” (cwd) for the job
jobspec.cwd = os.getcwd()
This is how we set the job environment
jobspec.environment = dict(os.environ)
Let’s submit the job! We will get the job id.
This could have easily been a script, e.g., ./compute.py 120 You can continue submitting jobs to your same handle, even the same job.
Total running time of the script: ( 0 minutes 0.232 seconds)