Advanced JVM tuning | JVM profiling

advanced-jvm-tuning

#Garbage Collection Tuning
-server 
-Xms10g 
-Xmx10g
-XX:+AlwaysPreTouch
-XX:+UseG1GC
-XX:+ScavengeBeforeFullGC
-XX:+DisableExplicitGC

#Getting Heap Dump on Out of Memory Errors
-XX:+HeapDumpOnOutOfMemoryError 
-XX:HeapDumpPath=/path/to/heapdump
-XX:OnOutOfMemoryError=“kill -9 %p” 
-XX:+ExitOnOutOfMemoryError

#Detailed Garbage Collection stats
-XX:+PrintGCDetails
-XX:+PrintGCTimeStamps
-XX:+PrintGCDateStamps
-XX:+UseGCLogFileRotation
-XX:NumberOfGCLogFiles=10
-XX:GCLogFileSize=100M
-Xloggc:/path/to/gc/logs/log.txt

#FlightRecorder Settings
-XX:+UnlockCommercialFeatures
-XX:+FlightRecorder
-XX:+UnlockDiagnosticVMOptions
-XX:+DebugNonSafepoints

#To start recording for a particular Java process use this command as an example
jcmd <PID> JFR.start name=<recordcing_name> duration=60s filename=/var/recording/recording.jfr settings=profile