[cyberpunk]

You can get into difficulty with kubernetes here, as your jvm will detect all cores on the node but you may have set a resources limit on the pod/whatever, so it’ll assume it can spend more time doing stuff than it actually can, so often times it’s quite necessary to tune some things to prevent excessive switching etc.

[dpratt]

Modern JVMs will detect orchestrator-set cgroup limits and size themselves accordingly. If you, for example, set a cpu limit for a pod to “1”, the JVM will size itself as if it was running on a single core machine.

[cyberpunk]

TIL, this is great. Thanks, saved me some yaml :}

[EdwardDiego]

Nah they fixed the JVM to be container aware some versions ago - I do remember dealing with this in early Java 8 days, think Java 10 is when it got fixed, and then it was backported to later releases of Java 8.

[vips7L]

Afaik this was fixed a long time ago.