#4005: paraffins: slowdown of ca 2 with -O2
-----------------------------+----------------------------------------------
Reporter: hwloidl | Owner:
Type: bug | Status: new
Priority: high | Milestone: 6.12.3
Component: Compiler | Version: 6.12.1 RC1
Keywords: optimisation | Difficulty:
Os: Linux | Testcase: see attached (compile and run) log
Architecture: x86 | Failure: Runtime performance bug
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Changes (by igloo):
* priority: normal => high
* milestone: => 6.12.3
Comment:
Looks like GCer time is where the time is going:
No `-O`:
{{{
INIT time 0.00s ( 0.00s elapsed)
MUT time 44.11s ( 44.33s elapsed)
GC time 1.30s ( 1.32s elapsed)
EXIT time 0.00s ( 0.00s elapsed)
Total time 45.41s ( 45.65s elapsed)
%GC time 2.9% (2.9% elapsed)
}}}
With `-O`:
{{{
INIT time 0.00s ( 0.00s elapsed)
MUT time 45.39s ( 45.99s elapsed)
GC time 83.81s ( 83.53s elapsed)
EXIT time 0.00s ( 0.00s elapsed)
Total time 129.20s (129.52s elapsed)
%GC time 64.9% (64.5% elapsed)
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4005#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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