How to trigger screensaver on mac right away (osx maverick)

(1) In Maverick, the screen saver app is located at
/System/Library/Frameworks/ScreenSaver.framework/Versions/A/Resources/ScreenSaverEngine.app/Contents/MacOS/ScreenSaverEngine.

(2) Browse to that file in Finder, then right-click it to make alias.

(3) Next simply click the alias icon.