java-pmap-inspector

Inspect pmap -X output of a java process, requires Java 11, likely not 100% accurate.

Usage examples

$ pmap -X pid > pmap.txt; java JavaPmapInspector.java pmap.txt
$ java JavaPmapInspector.java <(pmap -X pid)
$ pmap -X pid | java JavaPmapInspector.java -

This project comes from a Java script I created mid-2020 to understand native memory consumption. The Java Native Memory Tracking wasn’t enough to understand the growth of the Resident Set Size of some JVM workloads. It uses the output of pmap (part of the procps package), this tool extract information from the OS /proc filesystem to get the system view of the process memory mappings.

Currently JavaPmapInspector script focus is to help diagnose the considerable amount of glibc arenas.

Contributions more than welcome.

TODO

• Tests

• Make an actual project structure

• …​