#6104: Regression: space leak in HEAD vs. 7.4
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Reporter: simonmar | Owner: simonpj
Type: bug | Status: new
Priority: highest | Milestone: 7.6.1
Component: Compiler | Version: 7.5
Keywords: | Os: Unknown/Multiple
Architecture: Unknown/Multiple | Failure: Compile-time performance bug
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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Comment(by simonpj):
There doesn't seem to be much of a difference on `CopyFile`, at least not
now. Here's the size of the .o file:
{{{
text data bss dec hex filename
With 7.4.1 6480 760 0 7240 1c48 T6104.o
With HEAD 4769 704 0 5473 1561 T6104.o
}}}
So HEAD generates less code, not more. The compiler does allocate a bit
more, but not much:
{{{
-------- 7.4.1 with -O on CopyFile.hs ------------
[1 of 1] Compiling CopyFile ( T6104.hs, T6104.o )
146,131,584 bytes allocated in the heap
67,295,032 bytes copied during GC
16,663,568 bytes maximum residency (6 sample(s))
1,330,480 bytes maximum slop
33 MB total memory in use (0 MB lost due to fragmentation)
-------- HEAD with -O on CopyFile.hs ------------
[1 of 1] Compiling CopyFile ( T6104.hs, T6104.o )
156,295,232 bytes allocated in the heap
71,474,496 bytes copied during GC
16,357,872 bytes maximum residency (7 sample(s))
1,451,648 bytes maximum slop
32 MB total memory in use (0 MB lost due to fragmentation)
}}}
I suppose the next thing is to try compiling Cabal.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6104#comment:8>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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