Configure admission fair sharing in Red Hat build of Kueue 1.4

Summary

Red Hat build of Kueue 1.4 provides admission fair sharing for shared CPU, GPU, and high-performance computing clusters where FIFO admission can starve later workloads. The guide configures the feature through the Kueue custom resource, using either default values—30-minute usage half-life, five-minute sampling interval, and resource weights of 1—or custom settings, then creates a ResourceFlavor, a ClusterQueue using UsageBasedAdmissionFairSharing, and two LocalQueues. Kueue tracks each LocalQueue's historical consumption, adds a temporary penalty when a workload is admitted, and compares usage adjusted by queue weight to choose the lowest-use pending workload when quota returns. In the example, lq-a receives the first job, lq-b is admitted after job1 is deleted, and usage decays or grows on sampling ticks; usage ordering takes precedence over priority classes, which only break ties.

Takeaways

1. 1

   Admission fair sharing reorders workloads at admission time without evicting running workloads; fair sharing-based preemption can evict them.

2. 2

   The default configuration uses a 30-minute usage half-life, a five-minute sampling interval, and a resource weight of 1 for each resource; these defaults may change.

3. 3

   Usage-based ordering across LocalQueues takes precedence over priority classes, with priority used as a tiebreaker when usage is equal.