On 6/5/19 2:33 PM, Vitaly Davidovich wrote: > Does anyone have ideas on pinpointing this further? I have the educated guess: https://bugs.openjdk.java.net/browse/JDK-8181859 Which means you can try if -XX:MonitorUsedDeflationThreshold=0 reduces the number of "guaranteed" safepoints. -- Thanks, -Aleksey