[erlang-questions] OSX: binding schedulers to processor cores doesn't work

[Zabrane Mickael]

Hi guys,

Trying to bind schedulers to processor cores simply fail on my MacOSX (10.7.4) using R15B01 and R15B02:
$ erl +sbt db
setting scheduler bind type 'db' failed: not supported
[...]

All other binding options failed too. Why?

How one can use "+sbt db", now that the call to "erlang:system_flag(scheduler_bind_type,default_bind)" is deprecated?

Regards,
Zabrane

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[Rickard Green]

Binding of schedulers has never been supported on MacOSX. I've not put much effort into it, but when I last looked into it (a long time ago) I couldn't find any functionality in MacOSX that could be used for this. This might have changed, thought. If you want to look into it, a patch implementing this is welcome.

Regards,
Rickard Green, Erlang/OTP, Ericsson AB

[Zabrane Mickael]

Hi Richard,

Spent time looking for "set_affinity" equivalent on OSX today.

Referring to this (page 3) http://images.apple.com/media/us/osx/2012/docs/OSX_for_UNIX_Users_TB_July2011.pdf 

it looks like OSX' scheduler (Snow, Lion, Mountain) still doesn't implement processor affinity for processes nor threads. 

Grrrrrrr !

Regards,

Zabrane