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README.JPP
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README
Java Performance Pack for Win32
Version 1.1.5 (Early-access release)
-----------------------------------------------------------------------
CONTENTS
Overview of the Performance Pack
System requirements
Installing the Performance Pack
Using the JIT compiler
- Using the JIT compiler in conjunction with the JDK
- Using the JIT compiler in conjunction with the JRE
Uninstalling the JIT compiler
-----------------------------------------------------------------------
OVERVIEW OF THE JAVA PERFORMANCE PACK
-----------------------------------------------------------------------
The Java Performance Pack for Win32, version 1.1.5, contains an early-
access version of a JIT compiler. When installed, the Performance
Pack's JIT compiler should provide an increase in the speed with which
your Java applications and applets run. In some cases, up to 10X
improvement in performance can be realized.
BECAUSE THIS IS A TECHNOLOGY PREVIEW RELEASE ONLY, THE PERFORMANCE
PACK'S JIT COMPILER SHOULD NOT BE USED FOR MISSION-CRITICAL
APPLICATIONS.
If you encounter any problems or bugs with the Performance Pack,
please report them via the JavaSoft bug submission web page at
http://java.sun.com/cgi-bin/bugreport.cgi
-----------------------------------------------------------------------
SYSTEM REQUIREMENTS
-----------------------------------------------------------------------
The Performance Pack JIT compiler is available only for Win32
platforms. The Performance Pack JIT compiler requires that JDK 1.1.5 or
JRE 1.1.5 be installed on your machine. Note that JDK 1.1.5 and
JRE 1.1.5 will not work on Windows NT 3.51.
----------------------------------------------------------------------
INSTALLING THE PERFORMANCE PACK
-----------------------------------------------------------------------
To install the Performance Pack, double click on the Performance Pack
file that you downloaded from the JavaSoft web site. This will open an
InstallShield script that will step you through the installation
process.
Note that some browsers give you the option of executing the download
file directly from the JavaSoft web site without saving a copy of the
download file to your disk.
-----------------------------------------------------------------------
USING THE JIT COMPILER
-----------------------------------------------------------------------
USING THE JIT COMPILER IN CONJUNCTION WITH THE JDK --------------------
To use the JIT compiler in conjuction with the JDK's java, javac or
appletviewer command-line tools, you must set the JAVA_COMPILER
environment variable to the value "symcjit". Use the following command
from the DOS prompt:
set JAVA_COMPILER=symcjit
When the JAVA_COMPILER environment variable is set, the JIT compiler
will be the default compiler invoked by the command-line tools.
An alternative way of invoking the JIT compiler is to set the value of
the java.compiler property to "symcjit". With the javac and
appletviewer tools, you can do this as follows:
appletviewer -J-Djava.compiler=symcjit MyApplet.html
javac -J-Djava.compiler=symcjit MyApp.java
When using the java command-line tool, you can set java.compiler as
follows:
java -Djava.compiler=symcjit MyApp
If you don't want the JIT compiler to be invoked by default, unset
the JAVA_COMPILER environment variable. You do this by setting
JAVA_COMPILER to no value:
set JAVA_COMPILER=
USING THE JIT COMPILER IN CONJUNCTION WITH THE JRE --------------------
If JRE 1.1.5 and the JIT compiler are both installed, the JIT compiler
is the default compiler invoked by the jre command-line tool. If you
want to run an application using only the default interpreter, without
invoking the JIT compiler, you can use the jre command with the -nojit
option.
-----------------------------------------------------------------------
UNINSTALLING THE JIT COMPILER
-----------------------------------------------------------------------
If for any reason you wish to uninstall the JIT compiler, you may do
so from the Add/Remove Programs control panel of Windows 95/NT.
-----------------------------------------------------------------------
Copyright ⌐ 1997, 1998 Sun Microsystems, Inc.
901 San Antonio Road, Palo Alto, CA 94303-4900 USA
All rights reserved.