#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 simonmar):
One more tip: when using `-threaded`, never use the main thread to do the
real work. Communication between the main thread and other `forkIO`'d
threads is much much slower than between two `forkIO`'d threads, because
the main thread is a "bound thread" (i.e. it has an OS thread to itself).
This is perhaps the main reason that turning on `-threaded` will make the
version of `threadring` above go much slower.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1889#comment:5>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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