Java: non-heap-memory analyzes

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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.

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