#5272: Performance regression
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Reporter: augustss | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.0.4 | Keywords:
Testcase: | Blockedby:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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The code generated by ghc 7.0.4 is significantly slower than the one for
ghc 6.12.4 for one of our large programs.
For a typical benchmark, with ghc-6.12.4 the compiled code ran in 110s and
with ghc-7.0.4 it runs in 125s. This is 14% slower. The program was
compiled with the same flags in both cases, notably -O2.
It's difficult to pin down the difference, because when compiled for
profiling they run at about the same speed. And as usual the profiling
information from ghc is wildly inaccurate (with both versions, but in
different ways).
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5272>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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