Is UseGCOverheadLimit supported by ZGC?

Question

we are currently using G1GC which does not honour/support UseGCOverheadLimit, so our app is sometimes completely stuck in GC-thrashing and the jvm never aborts/crashes.

Just checking which options we do have, according to this overview the latest GC is ZGC but I can't find anything whether ZGC actually supports the overhead limit?

Answer 1

Use this simple command to verify if that JVM option is enabled:

java -XX:+PrintFlagsFinal -XX:+UseZGC -version | grep -i Overhead
     bool UseGCOverheadLimit                       = true                                      {product} {default}
java version "17.0.3.1" 2022-04-22 LTS
Java(TM) SE Runtime Environment (build 17.0.3.1+2-LTS-6)
Java HotSpot(TM) 64-Bit Server VM (build 17.0.3.1+2-LTS-6, mixed mode, sharing)