Is it possible to set pthread CPU affinity in OS X?

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Asked 31/5, 2011 at 6:42 Answered 31/5, 2011 at 7:31

Solved linux multithreading macos pthreads affinity

In Linux there is a sched_setaffinity() function defined in sched.h, but I can't seem to find anything like that in Mac OS X 10.6 pthreads implementation... If it is not possible to set affinity, what is the default policy in OS X?

Hamite answered 31/5, 2011 at 6:42 Comment(1)

See this blog: yyshen.github.io/2015/01/18/binding_threads_to_cores_osx.html – Westernism 8/4, 2016 at 17:45

Mac OS X has Thread Affinity API and you can use it with pthread ID as thread_policy_set(pthread_mach_thread_np(pthreadId), but, as far as I know, there are no APIs like sched_setaffinity.

Golfer answered 31/5, 2011 at 7:31 Comment(2)

What the hell? I took a look at Mac OS X 10.6 SDK's /usr/include/mach/thread_policy.h and found out that the thread_policy_set() / thread_policy_get() functions are commented out! What is the meaning of this?! – Hamite 31/5, 2011 at 8:1

It is really compatible with pthread. Please take a look at /Developer/Extras/CoreAudio/PublicUtility/CAPThread.cpp or google "thread_policy_set pthread_mach_thread_np". And thread_policy_set/thread_policy_get are in /Developer/SDKs/MacOSX10.6.sdk/usr/include/mach/x86_64/thread_act.h . Anyway, these API are not same as sched_setaffinity. – Golfer 31/5, 2011 at 11:28

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