[GHC] #1589: Process creation and communication doesn't scale linearly

[Don Stewart]

Great work!!

trac:
> #1589: Process creation and communication doesn't scale linearly
> ----------------------------+-----------------------------------------------
>  Reporter:  guest           |          Owner:  simonmar        
>      Type:  bug             |         Status:  closed          
>  Priority:  normal          |      Milestone:  6.10 branch     
> Component:  Runtime System  |        Version:  6.7             
>  Severity:  minor           |     Resolution:  fixed           
>  Keywords:                  |     Difficulty:  Moderate (1 day)
>  Testcase:                  |   Architecture:  Multiple        
>        Os:  Multiple        |  
> ----------------------------+-----------------------------------------------
> Changes (by simonmar):
> 
>   * status:  new => closed
>   * resolution:  => fixed
> 
> Comment:
> 
>  Here's the results with the current HEAD.  GHC doesn't even break a sweat
>  with a million threads:
> 
>  {{{
>  $ ./1589 1000000
>  Creating pipeline with 1000000 processes in it.
>  Pumping a single message through the pipeline.
>  Pumping a 100 messages through the pipeline.
>         n   create    pump1    pump2 create/n  pump1/n  pump2/n
>                  s        s        s       us       us       us
>   1000000    5.612    1.108   17.969     5.61     1.11     0.18
>  }}}
> 
>  Creation scales linearly until I run out of memory.  You can improve the
>  results even more by making stacks start a bit smaller:
> 
>  {{{
>  $ ./1589 1000000 +RTS -k500
>  Creating pipeline with 1000000 processes in it.
>  Pumping a single message through the pipeline.
>  Pumping a 100 messages through the pipeline.
>         n   create    pump1    pump2 create/n  pump1/n  pump2/n
>                  s        s        s       us       us       us
>   1000000    3.780    1.140   15.009     3.78     1.14     0.15
>  }}}
> 
> -- 
> Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1589#comment:6>
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