programming

Java

→ Heap dump

→ Generate a Heap dump

→ On demand

The jcmd tool produce a binary heap dump

jcmd <pid> GC.heap_dump <file-path>

→ On crash

The below option does not add overhead, and using it in production is a good idea.

java -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=<file-or-dir-path>

→ Analyse a thread dump

Eclipse Memory Annalyser allows to analyse the resulting dump files. this tutorial explains well how to use the tool.