#5367: Program in (-N1) runs 10 times slower than it with two threads (-N2)
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Reporter: wuxb | Owner: simonmar
Type: bug | Status: closed
Priority: high | Milestone: 7.4.1
Component: Runtime System | Version: 7.0.4
Resolution: wontfix | Keywords: thread ffi
Testcase: | Blockedby:
Difficulty: | Os: Linux
Blocking: | Architecture: x86_64 (amd64)
Failure: Runtime performance bug |
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Comment(by marlowsd@…):
commit 78e6b615329dd8ea4527b499107048693c87f895
{{{
Author: Simon Marlow <[email protected]>
Date: Wed Aug 3 13:41:33 2011 +0100
small optimisation for the program in #5367: if the worker thread
being woken already has its wakeup flag set, don't bother signalling
its condition variable again.
rts/Capability.c | 12 +++++++-----
1 files changed, 7 insertions(+), 5 deletions(-)
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5367#comment:4>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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