#2328: Compiling DoCon with 6.8.3 has 3x slow-down compared with 6.8.2
------------------------------------------+---------------------------------
Reporter: simonpj | Owner:
Type: compile-time performance bug | Status: new
Priority: normal | Milestone: 6.8.3
Component: Compiler | Version: 6.8.2
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Architecture: Unknown
Os: Unknown |
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Changes (by igloo):
* milestone: => 6.8.3
Comment:
Here's where I am so far, using
http://haskell.org/docon/distrib/2.11/docon-2.11.zip
With 6.8.3 RC:
{{{
$ ghc -O -fglasgow-exts -fallow-overlapping-instances -fallow-undecidable-
instances -O --make RsePol_.hs -fforce-recomp +RTS -M400M
[...]
$ ghc -O -fglasgow-exts -fallow-overlapping-instances -fallow-undecidable-
instances -O -c RsePol_.hs -fforce-recomp -v +RTS -M400M
[...]
*** Parser:
*** Renamer/typechecker:
*** Desugar:
Result size = 3830
*** Simplify:
Result size = 2895
Result size = 2691
Result size = 2689
Result size = 2689
*** Specialise:
Result size = 2689
*** Float out (not lambdas, not constants):
Result size = 2751
*** Float inwards:
Result size = 2751
*** Simplify:
Heap exhausted;
Current maximum heap size is 399998976 bytes (381 Mb);
}}}
while 6.8.2 goes:
{{{
[...]
*** Parser:
*** Renamer/typechecker:
*** Desugar:
Result size = 3827
*** Simplify:
Result size = 2899
Result size = 2701
Result size = 2699
Result size = 2699
*** Specialise:
Result size = 2699
*** Float out (not lambdas, not constants):
Result size = 2768
*** Float inwards:
Result size = 2768
*** Simplify:
Result size = 309049
Result size = 216314
Result size = 81507
[...]
}}}
(and is also happy with a 200M heap).
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2328#comment:1>
GHC <http://www.haskell.org/ghc/>
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