#5259: Heap used by compacting collector larger than heap used without.
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Reporter: r6 | Owner: simonmar
Type: bug | Status: closed
Priority: high | Milestone: 7.2.1
Component: Runtime System | Version: 6.12.3
Resolution: worksforme | Keywords:
Testcase: | Blockedby:
Difficulty: | Os: Linux
Blocking: | Architecture: x86
Failure: None/Unknown |
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Changes (by simonmar):
* status: new => closed
* resolution: => worksforme
Comment:
I suspect this is fixed. Your program didn't work, because `[0..]` has
type `[Word8]` and thus only has 256 elements, so I had to modify it
slightly:
{{{
l = map (BS.replicate (1024^2 `div` 2) . fromIntegral) [(0::Int)..]
}}}
with this change, I get the same behaviour with and without `-c`. First,
with `+RTS -M100m -c -s`:
{{{
eap exhausted;
Current maximum heap size is 104857600 bytes (100 MB);
use `+RTS -M<size>' to increase it.
155,883,256 bytes allocated in the heap
103,920,168 bytes copied during GC
103,930,080 bytes maximum residency (9 sample(s))
878,368 bytes maximum slop
105 MB total memory in use (0 MB lost due to fragmentation)
}}}
and with `+RTS -M100m -s`:
{{{
Heap exhausted;
Current maximum heap size is 104857600 bytes (100 MB);
use `+RTS -M<size>' to increase it.
155,883,256 bytes allocated in the heap
162,745,832 bytes copied during GC
103,930,064 bytes maximum residency (9 sample(s))
1,046,320 bytes maximum slop
105 MB total memory in use (0 MB lost due to fragmentation)
}}}
I got the same results with 7.0.3 and the current master.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5259#comment:4>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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