#3553: parallel gc suffers badly if one thread is descheduled
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Reporter: simonmar | Owner: igloo
Type: merge | Status: new
Priority: normal | Milestone: 6.12.2
Component: Runtime System | Version: 6.10.4
Keywords: | Difficulty: Unknown
Os: Unknown/Multiple | Testcase:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Comment(by simonmar):
I tried using futexes today, and so far haven't managed to beat the
performance of the `sched_yield` spinlocks, but I might not be using them
right. I fully expect futexes to be better. (also, futexes are not
exactly a real API. The syscall isn't even exposed by glibc, you have to
define it manually, as I discovered with some help from folks on #ghc).
I can entirely believe that `sched_yield` is never the absolute right
thing, but it might be the best ''portable'' solution we have.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3553#comment:4>
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