#650: Improve interaction between mutable arrays and GC
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Reporter: simonmar | Owner: simonmar
Type: bug | Status: new
Priority: normal | Milestone: 6.14.1
Component: Runtime System | Version: 6.4.1
Resolution: | Keywords:
Difficulty: Difficult (2-5 days) | Os: Unknown/Multiple
Testcase: | Architecture: Unknown/Multiple
Failure: Runtime performance bug |
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Comment (by simonmar):
cmpxchg is also only atomic with a LOCK prefix. Typically a LOCK prefix
adds on the order of 100 cycles, even without contention. Apprently it's
better on Nehalem CPUs, but still we need something that works well across
a variety of hardware. I don't think using byte writes are a big problem
in practice.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/650#comment:22>
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