JVM Profiling refers to the process of analyzing the performance and behavior of applications running on the Java Virtual Machine (JVM).
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Heap Memory Issue
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Eclipse Memory Analyzer Tool (MAT)
A powerful Java heap analyzer that helps you identify memory leaks and optimize memory usage in Java applications.
- Heap Dump Analysis
- Leak Suspects Report
- Retained Sizes Calculation
- Memory Consumption Patterns
Shallow Heap: The shallow heap of an object is the amount of memory that is directly allocated for that object.
Retained Heap: The retained heap of an object is the amount of memory that will be freed when the object is garbage collected. It includes the shallow heap of the object and the shallow heap of all objects that are reachable only from that object.
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Dominator Tree
A dominator tree is a representation of the object graph where each node (object) is dominated by its parent. An object X is said to dominate an object Y if every path from the root to Y must pass through X1.
Purpose: The dominator tree helps you identify the largest chunks of retained memory and understand the keep-alive dependencies among objects.
Path to GC
Eclipse MAT configuration
How to create Heap Dump
Configure below VM argument while running the java application
-XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=C:/Users/xxxx/myapps/perf/heapdump -Xmx512m
Important Reports in MAT
Leak Report
Histogram Report
Dominator Report
Details on analysis can be found below
Heap Exhaustion – Memory Leak
Heap Exhaustion – High Volume of Objects
Heap Space Exhaustion- Large Data Structures
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