How to turn off hyperthreading in Lion?

I've read discussions about turning off hyperthreading, but none of the methodolgies suggested will work in 10.7. How can this be done in Lion?
I'd like to try turning it off because I have a number-crunching program that is called repeatedly and it hangs at different random points in the code sometimes, even when processing the same data (I have a test case that I've put into a loop--it fails after different numbers of iterations and at different points in the code but it is always running on the same data). The same code runs with no problems on my SL Mac mini and MacBook 5,1, but not on my Lion Mac mini w/ 2.7 GHz i7.
I tried copying the CPUPalette.app from my SL computer as well as the SL Processor.prefPane, but neither will run under Lion. I have the Xcode developer software (version 4.1, with updates) but can't find a version of CHUD for it (I've seen reference to stand-alone CHUD tools on the Developer site, but I can't find them and Search of the site doesn't recognize CHUD). If someone can provide a direct link, that would be great!

No, I haven't. Evidently that is not available through the free developer program. Here's what I get when I follow that link:
You do not have access to this resource based on your membership.
Access to technical resources such as pre-release software and associated documentation, and information related to distributing iOS or Mac apps on the App Store are benefits offered to Apple Developer Program members.
Either the Apple ID and password you entered is not associated with an Apple Developer Program, or the Program that you are enrolled in does not have access to this resource.

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