java-profiling

Thread Dump

• mvn clean install -f deadlock/pom.xml
• java -jar deadlock/target/deadlock.jar
• jcmd
• jcmd Thread.print -l > oom/target/thread-dump.txt
• load thread-dump.txt to https://fastthread.io

Heap Dump

• mvn clean install -f oom/pom.xml
• java -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=oom/target/heap-dumps -jar oom/target/oom-jar-with-dependencies.jar
• jсmd
• jcmd GC.heap_dump
• load dump to MAT(with IBM Memory Analyzer tool)
• or load dump to to https://heaphero.io/

GC Logs

• mvn clean install -f gc/pom.xml
• java -Xlog:gc:gc/target/gc.log -jar gc/target/gc-jar-with-dependencies.jar
• load log to https://gceasy.io/

VM Info

• jps -lvm
• jinfo -flags
• jinfo -sysprops
• jcmd VM.system_properties
• jcmd VM.flags

Remote Profiling

• mvn clean install -f gc/pom.xml

java \
-Dcom.sun.management.jmxremote=true \
-Dcom.sun.management.jmxremote.port=65535 \
-Dcom.sun.management.jmxremote.ssl=false \
-Dcom.sun.management.jmxremote.authenticate=false \
-Dcom.sun.management.jmxremote.local.only=false \
-Djava.rmi.server.hostname=localhost \
-jar gc/target/gc-jar-with-dependencies.jar

• connect with jconsole

Remote Debugging

• mvn clean install -f gc/pom.xml
• java -jar -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:5005 gc/target/gc-jar-with-dependencies.jar
• connect with idea