Could you please file this as a bug at this address,
http://hackage.haskell.org/trac/ghc/newticket?type=bug
Cheers,
Don
ales.bizjak0:
> Hello,
>
> I'm experiencing some strange behaviour with GHC 6.10 and would like an
> explanation why.
>
> Here's the problem. With GHC 6.8.[23] memory usage of a program was about
> 250mb (computing pi to 10^6 decimals).
> Now I tried recompiling and running with GHC 6.10 and I got more than
> 1.4gb before I killed it, so naturally I tried profiling but
> here's the strangeness. When I compile for profiling with -prof -auto-all
> and run with +RTS -p -RTS memory use is
> still about the same as before (> 1.4gb), but when I try running with +RTS
> -hc -RTS memory only reaches about 250mb.
>
> What is the explanation for this behaviour?
>
> I would send a program but it requires HERA, which is not on hackage ...
>
> Here is the output of -s
>
> ./Test 100000 +RTS -s
> 47,467,176 bytes allocated in the heap
> 18,046,776 bytes copied during GC
> 9,215,104 bytes maximum residency (6 sample(s))
> 711,520 bytes maximum slop
> 80 MB total memory in use (11 MB lost due to fragmentation)
>
> Generation 0: 84 collections, 0 parallel, 0.01s, 0.01s elapsed
> Generation 1: 6 collections, 0 parallel, 0.01s, 0.01s elapsed
>
> INIT time 0.00s ( 0.00s elapsed)
> MUT time 3.66s ( 3.71s elapsed)
> GC time 0.02s ( 0.02s elapsed)
> RP time 0.00s ( 0.00s elapsed)
> PROF time 0.00s ( 0.00s elapsed)
> EXIT time 0.00s ( 0.00s elapsed)
> Total time 3.68s ( 3.73s elapsed)
>
> %GC time 0.5% (0.6% elapsed)
>
> Alloc rate 12,982,553 bytes per MUT second
>
> Productivity 99.5% of total user, 97.9% of total elapsed
>
>
>
>
> ./Test 100000 +RTS -s -hc
> 47,471,160 bytes allocated in the heap
> 18,637,752 bytes copied during GC
> 13,580,144 bytes maximum residency (37 sample(s))
> 810,712 bytes maximum slop
> 33 MB total memory in use (7 MB lost due to fragmentation)
>
> Generation 0: 85 collections, 0 parallel, 0.02s, 0.02s elapsed
> Generation 1: 37 collections, 0 parallel, 0.00s, 0.01s elapsed
>
> INIT time 0.00s ( 0.00s elapsed)
> MUT time 3.67s ( 3.73s elapsed)
> GC time 0.02s ( 0.03s elapsed)
> RP time 0.00s ( 0.00s elapsed)
> PROF time 0.00s ( 0.00s elapsed)
> EXIT time 0.00s ( 0.00s elapsed)
> Total time 3.70s ( 3.77s elapsed)
>
> %GC time 0.6% (0.8% elapsed)
>
> Alloc rate 12,941,165 bytes per MUT second
>
> Productivity 99.2% of total user, 97.4% of total elapsed
>
>
>
>
> --
> Best regards, Aleš
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