[GHC] #9233: Compiler performance regression

[GHC]

#9233: Compiler performance regression
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        Reporter:  augustss      |            Owner:
            Type:  bug           |           Status:  new
        Priority:  low           |        Milestone:
       Component:  Compiler      |          Version:  7.8.2
      Resolution:                |         Keywords:
Operating System:  Windows       |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown  |       Difficulty:  Unknown
       Test Case:                |       Blocked By:
        Blocking:                |  Related Tickets:
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Old description:

> Compiling all of our Haskell modules (about 1300 modules, 310 kLOC) takes
> about 30% longer with ghc 7.8 than it did with ghc 7.2.  (Using 32-bit
> Windows.)
>
> Sorry, I can't really provide any simple test case.

New description:

 Compiling all of our Haskell modules (about 1300 modules, 310 kLOC) takes
 about 30% longer with ghc 7.8 than it did with ghc 7.6.  (Using 32-bit
 Windows.)

 Sorry, I can't really provide any simple test case.

--

Comment (by augustss):

 Oops, I meant to say ghc 7.6, not 7.2 in my bug report.

 If I have some time I'll try to find a single module where the compilation
 has slowed down, and see if I can profile that.  Is there a way to get
 hold of a profiling ghc binary?  Compiling ghc on Windows always takes a
 few days to get working.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9233#comment:2>
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