#7923: Optimization for takeMVar/putMVar when MVar left empty
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Reporter: ezyang | Owner: ezyang
Type: task | Status: new
Priority: normal | Component: Runtime System
Version: 7.7 | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: Runtime performance bug | Blockedby:
Blocking: | Related:
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Right now, we always add an MVar to the mutable list when we
takeMVar/putMVar. However, this is unnecessary when the MVar is left
empty. This patch arranges that we don't add the MVar to the mutable list
in those cases. I've validated the patch but haven't checked performance
changes yet.
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7923>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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