Eclipse startup is controlled by the options in $ECLIPSE_HOME/eclipse.ini. If $ECLIPSE_HOME is not defined, the default eclipse.ini in your Eclipse installation directory (or in the case of Mac, theEclipse.app/Contents/MacOS directory) is used.
eclipse.ini 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 here.
Each option and each argument to an option must be on its own line.
All lines after -vmargs are passed as arguments to the JVM, so all arguments and options for eclipse must be specified before -vmargs (just like when you use arguments on the command-line)
Any use of -vmargs on the command-line replaces all -vmargs settings in the .ini file unless --launcher.appendVmargs is specified either in the .ini file or on the command-line. (doc)
By default, eclipse.ini looks something like this (the exact contents will vary based on operating system and which Eclipse package you have):
-startup ../../../plugins/org.eclipse.equinox.launcher_1.2.0.v20110502.jar --launcher.library ../../../plugins/org.eclipse.equinox.launcher.cocoa.macosx.x86_64_1.1.100.v20110502 -product org.eclipse.epp.package.jee.product --launcher.defaultAction openFile -showsplash org.eclipse.platform --launcher.XXMaxPermSize 256m --launcher.defaultAction openFile -vmargs -Dosgi.requiredJavaVersion=1.5 -XX:MaxPermSize=256m -Xms40m -Xmx512m
Among other things, this sets the heap space to 40MB initially and a maximum of 512MB, and also specifies a maximum PermGen size of 256MB. A max heap of 512MB might be OK for some users, but it's often necessary to bump that value up for large project sets or when some third-party plugins are installed.
3、Specifying the JVM 指定jvm：
One of the most recommended options to use is to 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 eclipse.ini 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 or relative path to the Java executable, not just to the Java home directory.
The -vm option must occur before the -vmargs option, since everything after -vmargs is passed directly to the JVM.
For the 32-bit Eclipse executable (eclipse.exe on Windows) a 32-bit JVM must be used and for the 64-bit Eclipse executable a 64-bit JVM must be used. 32-bit Eclipse will not work with a 64-bit JVM.
Here is an example of what eclipse.ini might look like on a Windows system after you've added the -vm argument and increased the maximum heap space:
-startup plugins/org.eclipse.equinox.launcher_1.2.0.v20110502.jar --launcher.library plugins/org.eclipse.equinox.launcher.win32.win32.x86_1.1.100.v20110502 -product org.eclipse.epp.package.java.product --launcher.defaultAction openFile --launcher.XXMaxPermSize 256M -showsplash org.eclipse.platform --launcher.XXMaxPermSize 256m --launcher.defaultAction openFile -vm C:\Java\JDK\1.6\bin\javaw.exe -vmargs -Dosgi.requiredJavaVersion=1.5 -Xms40m -Xmx1024m
Remember that the exact values will differ slightly depending on operating system and Eclipse package.
4、-vm value: Windows Example
This is how the -vm argument might look on Windows (your exact path to javaw.exe could be different, of course):
-vm C:\jdk1.7.0_21\bin\javaw.exe An alternative way is to insert the following VM option before the -vmargs option in the Eclipse shortcut properties(edit the field Target inside the "Shortcut" tab): -vm C:\jdk1.7.0_21\bin\javaw.exe or -vm C:\jdk1.7.0_21\jre\bin\java.exe
This might not work on all systems. If you encounter "Java was started but returned exit code=1" error while starting the eclipse, modify the -vm argument to point to jvm.dll (exact path could be different):
5、-vm value: Linux Example
This is how the -vm argument might look on Linux (your exact path to java could be different, of course):
6、-vm value: 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 eclipse.ini in the MacOS folder underContents.
To specify Java 6 for OS X:
For versions of Mac OS X 10.7+ the location has changed to
To be safer, determine the location for the JDK you intend to use via the utility /usr/libexec/java_home and put this value with .../bin/java appended into the Eclipse.ini file.