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Description and Overview

(Note that qdo is not actively supported or maintained by NERSC, but is available on our systems)

QDO (kew-doo) is a toolkit for managing many many small tasks within a larger batch framework. QDO separates the queue of tasks to perform from the batch jobs that actually perform the tasks. This simplifies managing tasks as a group, and provides greater flexibility for scaling batch worker jobs up and down or adding additional tasks to the queue even after workers have started processing them.

QDO was designed by the astrophysics community to manage queues of high throughput jobs.  It supports task dependencies, priorities, management of tasks in aggregate, and flexibility such as adding additional tasks to a queue even after the batch worker jobs have started.

The qdo module provides an API for interacting with task queues. The qdo script uses this same API to provide a command line interface that can be used interchangeably with the python API. Run "qdo -h" to see the task line options.

How to Access qdo on Edison/Cori

#- On Edison or Cori
module use /project/projectdirs/cosmo/software/modules/$NERSC_HOST
module load qdo/0.7



Further Information

qdo was developed to support workflows in processing images for cosmological surveys. For more information please contact Stephen Bailey in the Cosmology Group at Lawrence Berkeley Lab.