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# jstack | |
jstack -l <PID> > threads.txt | |
Generate Heap dump on EOM error | |
-XX:+HeapDumpOnOutOfMemoryError | |
#Heap | |
jmap -dump:file=DumpFile.dump <PID> | |
jhat DumpFile.dump | |
Eclipse MAT -> dominator tree | |
## Display the class name of all ClassLoaders | |
select classof(cl).name from instanceof java.lang.ClassLoader cl | |
Query an int array with a length greater than or equal to 256 | |
select a from [I a where a.length >= 256 | |
#async | |
java -XX:+UnlockDiagnosticVMOptions -XX:+DebugNonSafepoints -XX:+UseCountedLoopSafepoints -jar <JAR.FILE> | |
./profiler.sh -d 30 -f /tmp/flamegraph.html <PID> | |
#Linux process memory | |
pmap -x <PID> | |
#Native memoty tracking | |
java -XX:NativeMemoryTracking=summary -jar <JAR.FILE> | |
jcmd <PID> VM.native_memory | |
#Classloader statistic | |
jcmd <PID> VM.native_memory | |
#Class statistic | |
jcmd <PID> GC.class_stats | |
#LTAB allocation | |
sudo apt-get install openjdk-8-dbg | |
./profiler.sh -e alloc -d 10 -f /tmp/flamegraph.html <PID> | |
#Run application with eadger memory allocation | |
java -Xms=10G -Xmx=10Gb -XX:+AlwaysPreTouch -jar <JAR.FILE> | |
#Profile syscalls | |
profiler.sh -d 10 -e syscall:open <PID> | |
#Lock | |
profiler.sh -d 10 -e lock <PID> | |
#Start JFR | |
jcmd <PID> JFR.start duration=100s filename=flight.jfr | |
java -XX:StartFlightRecording=settings=profile.jfc -jar <JAR.FILE> | |
#Linux show process open files | |
ls -l /proc/<PID>/fd | |
#Show process listen sockets | |
netstat -tulpn | grep <PID> | |
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