How to disable Hyper Threading on 10.7?

Oppressed

macrumors 65816
Original poster
Aug 15, 2010
1,265
10
Reaching out to all the developers out there. I'm interested in finding the CPUPallet preference panel that use to be either located under /Library/Application Support/HWPrefs/CPUPalette or under the extras folder in the developer tools. Both locations are gone.

If anyone knows where I can find this preference panel again I would greatly appreciate it.
 

Madd the Sane

macrumors 6502a
Nov 8, 2010
508
40
Utah
Wirelessly posted (Mozilla/5.0 (iPod; U; CPU iPhone OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5)

Why do you want to disable hyperthreading?
 
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gglockner

macrumors 6502
Nov 25, 2007
403
3
Bellevue, WA
Sorry for the long delay in replying...

In Snow Leopard, there were three ways to disable HT on-the-fly. As far as I can tell, none of these work in Lion. However, you can permanently disable hyperthreading by issuing the following command in the Terminal:

sudo nvram SMT=0

To re-enable hyperthreading, use the command:

sudo nvram -d SMT

Changes will take effect when you reboot.
 
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