Fair-share scheduling policies

The AWS Batch scheduler evaluates when, where, and how to run jobs that are submitted to a job queue. If you don’t specify a scheduling policy when you create a job queue, the AWS Batch job scheduler defaults to a first-in, first-out (FIFO) strategy. A FIFO strategy might cause important jobs to get “stuck” behind jobs that were submitted earlier. By specifying a different scheduling policy, you can allocate compute resources according to your specific needs.

If you create a scheduling policy and attach it to a job queue, fair-share scheduling is turned on. If the job queue has a scheduling policy, the scheduling policy determines the order that jobs are run in. For more information, see Use fair-share scheduling policies to assign share identifiers.