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There is no overhead involved unless a OOM actually occurs. If you run your application with the VM flag -XX:+HeapDumpOnOutOfMemoryError a heap dump is written on the first Out Of Memory Error. Depending on your scenario, your OS platform and your JDK version, you have different options to acquire a heap dump. Those heap dumps are written by Sun HotSpot and any VM derived from HotSpot. The Memory Analyzer can work with HPROF binary formatted heap dumps.

Getting a Heap Dump HPROF dumps from Sun Virtual Machines These pages Querying Heap Objects (OQL) OQL Syntax MemoryAnalyzer/OQL also explain some of the ways to use Object Query Language (OQL) You will find there a collection of presentations and web articles on Memory Analyzer, which are also a good resource for learning. See the download page for installation instructions.īoth the Basic Tutorial chapter in the MAT documentation and the Eclipse Memory Analyzer Tutorial by Lars Vogel are a good first reading, if you are just starting with MAT.Ĭheck MemoryAnalyzer/Learning Material. find memory waste, like redundant String objects, empty collection objects, etc.compute paths from the garbage collector roots to interesting objects.

explore the object graph, both inbound and outbound references.

find the biggest objects, as MAT provides reasonable accumulated size (retained size).

The Eclipse Memory Analyzer tool (MAT) is a fast and feature-rich heap dump analyzer that helps you find memory leaks and analyze high memory consumption issues.

3.3 What if the Heap Dump is NOT Written on OutOfMemoryError?.

3.2 System Dumps and Heap Dumps from IBM Virtual Machines.

3.1 HPROF dumps from Sun Virtual Machines.