sysctl -w vm.max_map_count=131072
and restart WCS.
1. CPU load average is higher when ZGC is used, especially in JDK 15
Symptoms: CPU load average measured at system level (using htop for example) grows after update from JDK 12 or 14 to 15 if ZGC is used
Solution: use ZGC in JDK 12 or 14 only fro high loaded servers if GC pauses minimizing is required