Application to turn off cores?

[powerbook911]

I used to have an Apple application that sat in the menu bar. It gave you the option to select how many processors/cores you wanted to utilize. You could turn off the others.

Does anyone know what's it called and where to find it? Thanks.

 

[kainjow]

I think it's CHUD:
http://developer.apple.com/mac/library/qa/qa2001/qa1141.html