[GHC] #14981: GHC parallel GC is not doing well on modern many-core machine

[GHC]

#14981: GHC parallel GC is not doing well on modern many-core machine
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        Reporter:  varosi            |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Runtime System    |              Version:  8.4.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by varosi):

 I tried different nursery sizes. Even up to 300Mb, but the problem is that
 memory bandwidth has a cost and even with 128Gb of RAM, using more memory
 just slows down total run times/throughput. btw, I have written more on
 what I tried here:
 https://www.reddit.com/r/haskell/comments/85vwlq/our_lovely_ghc_parallel_gc_on_96_core_arm/

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14981#comment:9>
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