#6082: Program compiled with 7.4.1 runs many times slower than compiled with
7.2.2
-------------------------------------+--------------------------------------
Reporter: gchrupala | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.4.1 | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: Runtime performance bug | Testcase:
Blockedby: | Blocking:
Related: |
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The morfette program (http://hackage.haskell.org/package/morfette), when
compiled with 7.4.1 runs extremely slow: approx. 20x times slower than
when compiled with 7.2.1.
To reproduce, install morfette using both compilers, and run it on the
attached `sample' file.
{{{
morfette train sample output --iter-pos=10 --iter-lemma=3
}}}
I attach the output of the profiler for both compilers. It would seem the
performance bug is related to code from the modules
GramLab.Perceptron.Multiclass and GramLab.Perceptron.Vector
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6082>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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