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How can I disable hyperthreading in 10.9.3?

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BrockJon

macrumors newbie
Original poster
May 18, 2014
19
0
Calling All OSX Wizards....

How can I disable hyperthreading in OSX (10.9.3)? I have Xcode. Went Open Developer Tools > Instruments > Preferences > CPUs > Uncheck Hardware Multi-Threading. From there I've restarted; I've also invoked sleep mode and then woke the computer up. Either way, I'm still seeing 24 processors in Activity Monitor.

What do I need to do to get it to take?? :confused: And if I end up preferring it, what do I need to do to make the computer keep that preference (after reboots, et al)?

Thanks!!
 
BrockJon said:
Calling All OSX Wizards....

How can I disable hyperthreading in OSX (10.9.3)? I have Xcode. Went Open Developer Tools > Instruments > Preferences > CPUs > Uncheck Hardware Multi-Threading. From there I've restarted; I've also invoked sleep mode and then woke the computer up. Either way, I'm still seeing 24 processors in Activity Monitor.

What do I need to do to get it to take?? :confused: And if I end up preferring it, what do I need to do to make the computer keep that preference (after reboots, et al)?

Thanks!!
Click to expand...

AFAIK, it won't stick. In earlier versions of OSX there were Terminal commands that would "toggle" this. Now, invoking sleep or a restart will reset your setting change.
 
Downloaded from Apple's site and got the same error: "The installation failed. The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance."

This time I was able to open the Processor Pane but I don't think it's working correctly as it's showing "Core Freq: 0 Hz". I unchecked Hyperthreading, invoked Sleep - no change. Same with restarting.
 
Thank you!

That's interesting. Following the above Xcode/Instrument process, CPUPalette shows "thread B" disappearing as soon as I uncheck Hardware Multi-Threading. No sleep or restart.

Does this mean hyperthreading is actually disabled even though Activity Monitor still shows 24 processor windows?

And if I find the system to run better this way, is there a way to make hyperthreading disabled as the default?

Side note: CPUPalette can't fit all my processors on the screen. It cuts off at the header of CPU 11. There's no scroll bar or anything. Odd.
 
Most likely CPUPalette won't work. I'd try that before. It can't diable any core nor hyperthreading on my 4,1 (flashed 5,1).

Anyway, if your thread B disappear, you may use GeekBench to stress your CPU and see if the virtual core stay at zero loading in activity monitor.
 
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