How to disable Hyper Threading on 10.7?

Discussion in 'Mac OS X Lion (10.7)' started by Oppressed, Jul 24, 2011.

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  1. Oppressed, Jul 24, 2011

    Oppressed macrumors 65816

    Oppressed

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    Aug 15, 2010
    #1
    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.
     
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  2. Madd the Sane, Jul 24, 2011

    Madd the Sane macrumors 6502

    Madd the Sane

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    Utah
    #2
    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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  3. gglockner, Oct 23, 2011

    gglockner macrumors 6502

    gglockner

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    #3
    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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