[GHC] #8046: Make the timer management scale better across multicore

[GHC]

#8046: Make the timer management scale better across multicore
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       Reporter:  tibbe             |             Owner:
           Type:  bug               |            Status:  new
       Priority:  normal            |         Milestone:
      Component:  Compiler          |           Version:  7.6.3
       Keywords:                    |  Operating System:  Unknown/Multiple
   Architecture:  Unknown/Multiple  |   Type of failure:  None/Unknown
     Difficulty:  Unknown           |         Test Case:
     Blocked By:                    |          Blocking:
Related Tickets:                    |
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 A recent commit

 {{{
 commit e843e73690f828498f6e33bb89f47a50c3ab2ac9
 Author: Ian Lynagh <ian at well-typed.com>
 Date:   Sat Jun 8 20:19:59 2013 +0100

     IO manager: Edit the timeout queue directly, rather than using an edit
 list

     Fixes #7653.
 }}}

 undid an optimization to the management of timeouts (to fix a bug, which
 is good). We should check how much this hurt performance, but it might be
 better to rewrite the timeout management altogether. The current scheme
 scales poorly to several cores. We should probably have one priority queue
 per core and use an efficient mutable data structure.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8046>
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