#1889: Regression in concurrency performance from ghc 6.6 to 6.8
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Reporter: dons | Owner: simonmar
Type: bug | Status: new
Priority: normal | Milestone: 6.8.3
Component: Runtime System | Version: 6.8.1
Severity: normal | Resolution:
Keywords: threads, concurrency, performance | Difficulty: Unknown
Testcase: | Architecture: Multiple
Os: Multiple |
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Comment (by j.waldmann):
I noticed another strange behaviour (for threadring.hs from above):
when I compile (with 6.8) with -threaded and run with +RTS -N1,
runtime roughly doubles (w.r.t. omitting -threaded).
when I run with +RTS -N2, runtime again doubles (or more).
(this is on a dual core machine, x86 opensuse-10.3)
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1889#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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