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= Overview =
Eclipse startup is controlled by the options in <code>$ECLIPSE_HOME/eclipse.ini</code>. If <code>$ECLIPSE_HOME</code> is not defined, the default <code>eclipse.ini</code> in your Eclipse installation directory is used.

<code>eclipse.ini</code> is a text file containing command-line options that are added to the command line used when Eclipse is started up. There are many options available, please see [http://help.eclipse.org/stable/index.jsp?topic=/org.eclipse.platform.doc.isv/reference/misc/runtime-options.html here]. 

'''''Important:''''' 

#'''''Each option and each argument to an option must be on its own line.''''' 
#'''''All lines after <code>-vmargs</code> are passed as arguments to the JVM, so all arguments and options for eclipse must be specified before <code>-vmargs</code> (just like when you use arguments on the command-line)'''''

By default, <code>eclipse.ini</code> contains something like 

 -showsplash
 org.eclipse.platform
 --launcher.XXMaxPermSize
 256m
 -vmargs
 -Xms40m
 -Xmx256m

which sets the heap space to 40MB initially and a maximum of 256MB, and also specifies a maximum PermGen size of 256MB. 

= Specifying the JVM =
One of the most recommended options to use is to [[FAQ How do I run Eclipse?#Find_the_JRE|specify a specific JVM]] for Eclipse to run on. Doing this ensures that you are ''absolutely certain'' which JVM Eclipse will run in and insulates you from system changes that can alter the "default" JVM for your system. Many a user has been tripped up because they thought they knew what JVM would be used by default, but they thought wrong. eclipse.ini lets you be '''CERTAIN'''. 

The following examples of <code>eclipse.ini</code> demonstrate correct usage of the -vm option.

'''''Note the format of the -vm option - it is important to be exact''''': 

*The -vm option and its value (the path) must be on separate lines. 
*The value must be the full absolute path to the Java executable, not just to the Java home directory.

== Windows Example ==
 -showsplash
 org.eclipse.platform
 --launcher.XXMaxPermSize
 256m
 -vm
 C:\Java\JDK\1.5\bin\javaw.exe
 -vmargs
 -Xms40m
 -Xmx512m

== Linux Example ==
On a Linux system, the file looks quite similar: 

 -showsplash
 org.eclipse.platform
 --launcher.XXMaxPermSize
 256m
 -vm
 /opt/sun-jdk-1.6.0.02/bin/java
 -vmargs
 -Xms40m
 -Xmx512m

== Mac OS X Example ==
On a '''Mac OS X''' system, you can find eclipse.ini by right-clicking (or Ctrl+click) on the Eclipse executable in Finder, choose Show Package Contents, and then locate <code>eclipse.ini</code> in the <code>MacOS</code> folder under <code>Contents</code>. 

To specify Java 6 for OS X: 

 -showsplash
 org.eclipse.platform
 --launcher.XXMaxPermSize
 256m
 -vm
 /System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Home/bin/java
 -vmargs
 -Xms40m
 -Xmx512m

= See Also =

*[[FAQ How do I run Eclipse?]] 
*[[FAQ How do I increase the heap size available to Eclipse?]] 
*[[FAQ How do I increase the permgen size available to Eclipse?]]

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