[GHC] #11054: GHC on Windows could not use more than 64 logical processors

[GHC]

#11054: GHC on Windows could not use more than 64 logical processors
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        Reporter:  varosi            |                Owner:  Phyx-
            Type:  feature request   |               Status:  closed
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Runtime System    |              Version:  7.10.2
      Resolution:  fixed             |             Keywords:
Operating System:  Windows           |         Architecture:  x86_64
 Type of failure:  Runtime           |  (amd64)
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #12602            |  Differential Rev(s):  Phab:D2533
       Wiki Page:                    |
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Comment (by Phyx-):

 Ah ok, the first version (the one on the diff) spawns only 9 threads the
 one here 88 threads. In any case I'll add some more debugging info to the
 build and send a new one.

 Also how are you measuring this, just using task manager? When I was
 testing this I noticed task manager wasn't cpu group aware (at least for
 my test setup). Only resource monitor and Windows performance analyzer
 were able to give me accurate information.

 I assume the system is a production system which doesn't have Windows
 Performance analyzer? That would give an accurate view of what each thread
 is doing.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11054#comment:37>
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