Platform & DevOps·Placement, resources and the pod lifecycle
you promise the scheduler the workload needs half a core, and that half core is subtracted from the node whether or not you ever use it.
Resource request
Also calledrequest, CPU request, memory request, reservation
The amount of CPU and memory a workload reserves, used by the scheduler to decide which nodes can hold it. It is a claim on capacity rather than a cap on usage, which is the distinction almost everyone gets wrong first. Requests set far above real usage are how a cluster ends up at thirty percent utilisation and a full bin at the same time, and requests set far below are how a node ends up oversubscribed and thrashing.