Java: non-heap-memory analyzes

Question

we have the problem that our non-heap-memory is growing all the time. so we have to restart our jee (java8) - webapp every 3rd day (as you can see in the screenshot here: sc

Answer 1

Non-heap memory usage, as provided by MemoryPoolMXBean counts the following memory pools:

• Metaspace
• Compressed Class Space
• Code Cache

In other words, standard non-heap memory statistics includes spaces occupied by compiled methods and loaded classes. Most likely, the increasing non-heap memory usage indicates a class loader leak.

Use

• jmap -clstats PID to dump class loader statistics;
• jcmd PID GC.class_stats to print the detailed information about memory usage of each loaded class. The latter requires -XX:+UnlockDiagnosticVMOptions.