[GHC] #14407: rts: Threads/caps affinity

[GHC]

#14407: rts: Threads/caps affinity
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        Reporter:  pacak             |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Runtime System    |              Version:  8.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D4143
       Wiki Page:                    |
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Comment (by pacak):

 > How does this relate to the `setThreadAfinity` mentioned in #10229, that
 was implemented 3 years ago in GHC 7.10?

 They serve slightly different purpose. #10229 deals with distributing
 Haskell OS thread between underlying CPU cores in order to avoid when
 possible running code on different logical CPUs that gets mapped to the
 same physical CPU, while this `setAffinity` deals with distributing
 Haskell light threads between different capabilities - to allow giving
 some threads priority over some other threads but without having to
 manually pin them to specific capabilities.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14407#comment:4>
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