Chart 1. Submitting a simple two-layer workflow with PerQueue, where two separate tasks depend on the same task, can be done by running this script with Python. This script checks that the 3 python scripts (“step_*.py”) exist and then runs them in the correct order as subprocesses. The arguments dictionaries are serialized with JSON and saved in the backing database. The code script for each “step_*.py” can be found in the ESI.†.
