#3629: Code compiled WITHOUT profiling many times slower than compiled WITH
profiling on
-----------------------------+----------------------------------------------
Reporter: gchrupala | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.13 | Severity: major
Keywords: | Testcase:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
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I have a program which runs extremely slow when I compile it with
profiling disabled. It only becomes usable when compiled with profiling
options on (-prof -auto-all).
I reproduced it with GHC 6.10, 6.12 and 6.13.
The source is attached.
I compiled and ran like this:
{{{
ghc-6.13.20091027 --make -O2 runST.hs -fforce-recomp
time ./runST > /dev/null
real 5m9.670s
user 5m7.627s
sys 0m0.468s
ghc-6.13.20091027 --make -O2 runST.hs -fforce-recomp -prof -auto-all
real 0m39.544s
user 0m39.050s
sys 0m0.148s
}}}
In the meantime, is there is a workaround other than compiling with
profiling options on? I would prefer to modify the source rather than ask
users to install profiling libraries and mess with compiler options.
Best,
--
Grzegorz Chrupala
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3629>
GHC <http://www.haskell.org/ghc/>
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