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  • Created by John Rose, last modified on Mar 13, 2008
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HotSpot Internals

This wiki is written by and for programmers working on the HotSpot JVM system.

Intentions and non-intentions

This wiki contains:

  • An architectural guide to the Runtime, Compiler, GC, Serviceability, etc.
  • Details on performance techniques.
  • A place to document likely future work (major refactorings or cleanups, new optimizations, etc.).
  • Quick links to similar information in other places on the web.
    • http://java.sun.com/javase/technologies/hotspot ("Java SE HotSpot at a Glance")
    • http://openjdk.java.net/groups/hotspot/ (OpenJDK HotSpot Project home)
    • http://www.ssw.uni-linz.ac.at/Research/Papers/ (HotSpot-related research at the University of Linz)
  • Information which, once written, is expected to remain accurate and relevant, as long as the related code remains stable.

Please look for the following types of information elsewhere:

  • Not non-architectural or non-technical developer notes.
  • Not an introduction or quick-start for working on the JVM. (TO DO: Put links here.)
  • Not build instructions.
  • Not a substitute for comments in the source code.
  • Not a list of bugs or tasks.
  • Not a blog, forum, or the comments section thereof.

Interesting tasks to do

  • Extract links and info. from messages and blog postings, especially via hotspot-dev@openjdk.
  • Extract links and info. from historical Sun mailing lists and wikis. (Sun engineers have to do this!)
  • Write down understandings of major modules as they are (re-)acquired from trips through the code.
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