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Unlike my old Windows Boxes and Linux Boxes, I do not have access of something similar to a BIOS on my MacBook Pro.

I want to disable Intel i7's HyperThreading (so 4 cores look like 4 cores and don't try to simulate extra ones).

There are solutions for disable HT via developer tools temporarily, but I need something to do it permanently (one that does not reset on reboots).

This is for a MacBook Pro 15" Retina.

CyberSkull
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Sid
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2 Answers2

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Download and install Xcode. It includes a Processor.prefPane (not sure where it's located exactly) that allows you to disable hyperthreading.

With Xcode installed, you can also disable hyperthreading using the following terminal command:

hwprefs cpu_ht=false

I don't believe this setting is retained after restarting your Mac, so you might want to create an AppleScript to run that command on startup.

Kale Muscarella
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Any luck with the following? Requires a reboot to take.

$ sudo nvram SMT=0

Might be something you can put in boot-args as well but I couldn't find it.

$ sudo nvram boot-args=""

Ref: Technical Q&A QA1141 Disabling Processor Cores on a Multi-Core System

Brian
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