#4001: Implement an atomic readMVar ----------------------------+---------------------------------------------- Reporter: | Owner: ezyang simonmar | Status: new Type: task | Milestone: 7.6.2 Priority: low | Version: 6.12.2 Component: Runtime | Keywords: System | Architecture: Unknown/Multiple Resolution: | Difficulty: Moderate (less than a day) Operating System: | Blocked By: Unknown/Multiple | Related Tickets: Type of failure: | None/Unknown | Test Case: | Blocking: | ----------------------------+---------------------------------------------- Comment (by ezyang): Performance impact of the new patch: {{{ -------------------------------------------------------------------------------- Program Size Allocs Runtime Elapsed TotalMem -------------------------------------------------------------------------------- callback001 +0.1% +0.0% +1.4% +1.6% +0.0% callback002 +0.1% +0.0% -1.0% -1.0% +0.0% chan +0.1% +0.0% +0.0% +0.2% -2.0% sieve +0.1% +0.0% -1.0% -1.5% -8.0% threads001 +0.1% +0.0% -0.4% -0.3% +0.0% threads003 +0.1% -0.0% -0.2% -0.6% +0.0% threads006 +0.1% +0.0% +0.6% +0.6% +0.0% threads007 +0.1% +0.0% +0.4% +0.1% +0.2% -------------------------------------------------------------------------------- Min +0.1% -0.0% -1.0% -1.5% -8.0% Max +0.1% +0.0% +1.4% +1.6% +0.2% Geometric Mean +0.1% -0.0% -0.0% -0.1% -1.3% }}} Looks pretty good to me :) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/4001#comment:17 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler