About

This project is intended as a playground for memory consumption investigation of java-based apps.

How-to run the project

gradlew shadowJar - build executable jar
docker build -t spark-build . && docker run -p 4567:4567 -p 9999:9999 -p 9998:9998 --name spark-build -m 70m spark-build - start docker container

Useful commands:

docker stats - container's resource consumption
docker exec -it <container name> sh - run sh session inside a container
jcmd 1 VM.native_memory summary - get native memory stats
java -XX:+PrintFlagsFinal -version |grep ThreadStackSize - print stack size

Articles

jcmd stats interpritation: https://docs.oracle.com/javase/8/docs/technotes/guides/troubleshoot/tooldescr007.html
java inside Docker. Pitfalls: https://developers.redhat.com/blog/2017/03/14/java-inside-docker/
8u131 cgroups support: https://bugs.openjdk.java.net/browse/JDK-8170888
Metaspace in Java 8: https://dzone.com/articles/java-8-permgen-metaspace
jstat documentation: https://docs.oracle.com/javase/8/docs/technotes/tools/unix/jstat.html
Investigation on memory consumption: http://trustmeiamadeveloper.com/2016/03/18/where-is-my-memory-java/

Tools:

visualvm: https://visualvm.github.io/download.html