java -XshowSettings -version
java -XshowSettings:vm --version
jps
jstack -e -l 7 > jstack-$(date -u +"%Y-%m-%dT%H:%M:%SZ")
jstat -gc 7 2000
java -XX:+UnlockDiagnosticVMOptions -XX:+PrintFlagsFinal -version
Use showSettings:vm
to display JVM decisions :
java -XshowSettings:vm -version
java -Xms1500m -Xmx1600m -XshowSettings:vm -version
java -XX:MinRAMPercentage=50.0 -XX:MaxRAMPercentage=85.0 -XshowSettings:vm -version
Dump/stats mémoire :
jmap -histo 7
jmap -dump:live,format=b,file=heap.bin 7
java -verbose:gc -XX:+PrintGC -XX:+PrintGCDetails
java -Xlog:gc*