How to check installed Eclipse version 32-bit or 64-bit

You can check what version of eclipse is being installed on your Mac OS X Operating System by going to the eclipse folder and look for the eclipse icon,



Right Click on the icon and select "Show Package Contents" now go to Content/MacOS/, here you would see eclipse.ini file, lets see what details this file contains,

-startup
../../../plugins/org.eclipse.equinox.launcher_1.1.0.v20100507.jar
--launcher.library
../../../plugins/org.eclipse.equinox.launcher.cocoa.macosx.x86_64_1.1.0.v20100503
-product
org.eclipse.epp.package.php.product
--launcher.defaultAction
openFile
-showsplash
org.eclipse.platform
--launcher.XXMaxPermSize
256m
--launcher.defaultAction
openFile
-vmargs
-Dosgi.requiredJavaVersion=1.5
-XstartOnFirstThread
-Dorg.eclipse.swt.internal.carbon.smallFonts
-XX:MaxPermSize=256m
-Xms40m
-Xmx384m
-Xdock:icon=../Resources/Eclipse.icns
-XstartOnFirstThread
-Dorg.eclipse.swt.internal.carbon.smallFonts

Check the 4rd line,
../../../plugins/org.eclipse.equinox.launcher.cocoa.macosx.x86_64_1.1.0.v20100503

If it contains x86_64 then your eclipse is 64-bit or else if it contains just x86 then it is a 32-bit setup.