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Java Virtual Machine
====================
This document gathers technical informations about the Java VM to help
Java/Scala developers tuning their runtime settings on the Java VM.
VM Options
----------
* -Xmx option (maximum heap size)
Heaps larger than 2GB are available starting with J2SE 1.3.1
Default: 64M (32-bit UNIX and Windows)
* -Xms option (initial heap size)
Minimum: 1025K (Linux-i586, Solaris-i586), etc.. (see [vm08])
Default: 2M (32-bit UNIX and Windows)
* -Xss option (thread stack size)
Minimum: 48K (Linux-i586), 64K (Solaris-i586), etc.. (see [vm08])
Default: 256K (32-bit UNIX and Windows)
NB. Stack size under Windows is a link-time setting, so the executable
(java.exe) as created by Sun has this 256K limit built in. Windows
however, has a simple utility to modify the stack space of an
executable (see [vm03]).
In a command window (or Cygwin shell), use the EDITBIN command to
permanently modify the executable (WARNING! Do not reduce the stack
size below 32K, see [vm04])
EDITBIN /STACK:16000000 C:\Path\To\java.exe
Resources
=========
VM Options and Tools
--------------------
[vm01] Some useful -XX options
http://java.sun.com/javase/technologies/hotspot/vmoptions.jsp
[vm02] jvmstat 3.0
http://java.sun.com/performance/jvmstat/
[vm03] Modify the actual java.exe executable on Windows
http://www.eyesopen.com/docs/html/javaprog/node7.html
[vm04] Configuring server stack size
https://ssa.usyd.edu.au/docs/eassag/eassag20.htm
[vm06] Tuning the Java Runtime System
http://docs.sun.com/source/817-2180-10/pt_chap5.html
[vm07] JVM Tuning
http://www.caucho.com/resin-3.0/performance/jvm-tuning.xtp
[vm08] Java HotSpot: load the VM from a non-primordial thread and effects
on stack and heap limits.
http://blogs.sun.com/ksrini/entry/hotspot_primordial_thread_jni_stack
Garbage Collection
------------------
[gc01] Tuning Garbage Collection with the 5.0 Java[tm] Virtual Machine
http://java.sun.com/docs/hotspot/gc5.0/gc_tuning_5.html
[gc02] Tuning Garbage Collection with the 1.4.2 Java[tm] Virtual Machine
http://java.sun.com/docs/hotspot/gc1.4.2/
[gc03] Tuning Garbage Collection with the 1.3.1 Java[tm] Virtual Machine
http://java.sun.com/docs/hotspot/gc/
[gc04] Garbage Collector Ergonomics
http://java.sun.com/j2se/1.5.0/docs/guide/vm/gc-ergonomics.html
mics/20-Apr-2007
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