Profiling

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This document discusses Java profiling and provides an overview of Java memory, garbage collection, common memory problems, profiling tools, and a live demo. It begins with introductions and then covers JVM basics like memory areas, object layout, and garbage collection before discussing issues like memory leaks, I/O problems, and deadlocks. Tools covered include Linux utilities as well as JDK tools and profilers. The document concludes with a thank you and a link to view a live demo on GitHub.

JAVA
PROFILING
Jakub Kubrynski
jkubrynski@gmail.com
www.kubrynski.com

- jvm basics
- problems
- tools
- demo
- questions

--------------------------------------------------------------------------------------
MEMORY MEMORIESMEMORY MEMORIES
EDEN
SURVIV.
FROM
SURVIV.
TO
TENURED
PERM
GEN
CODE
CACHE
YOUNG GENERATION
OLD
GEN
METHOD
AREA
NATIVE
AREA
HEAP NON-HEAP
CALL
STACK

-shallowshallow
-deepdeep
-retainedretained

-------------------------------------------
SIZE MATTERS
Obj 1
Obj 3
Obj 4
Obj 2
GC
root

- NEW
- RUNNABLE
- BLOCKED
- WAITING
- TIMED_WAITING
- TERMINATED

-------------------------------------------
*NIX TOOLS
- top/htop
- iostat
- netstat
- free

-------------------------------------------
JDK TOOLS
- jps
- jinfo
- jmap
- jstat
- jhat
- jstack
- VisualVM (jvisualvm)

LIVE DEMO
github.com/jkubrynski/profiling

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