[Haskell-cafe] Streaming bytes and performance

[Branimir Maksimovic]

Are you sure? I use ghc 7.6.2 (compiled with -O2) and without bang patternsfor 1million iterations it blows stack space.With bang patterns it runs in constant space , same as other version?
bmaxa at maxa:~/haskell$ ./state +RTS -s500000500000          52,080 bytes allocated in the heap           3,512 bytes copied during GC          44,416 bytes maximum residency (1 sample(s))          17,024 bytes maximum slop               1 MB total memory in use (0 MB lost due to fragmentation)
                                    Tot time (elapsed)  Avg pause  Max pause  Gen  0         0 colls,     0 par    0.00s    0.00s     0.0000s    0.0000s  Gen  1         1 colls,     0 par    0.00s    0.00s     0.0001s    0.0001s
  INIT    time    0.00s  (  0.00s elapsed)  MUT     time    0.00s  (  0.00s elapsed)  GC      time    0.00s  (  0.00s elapsed)  EXIT    time    0.00s  (  0.00s elapsed)  Total   time    0.00s  (  0.00s elapsed)
  %GC     time       0.0%  (6.2% elapsed)
  Alloc rate    0 bytes per MUT second
  Productivity 100.0% of total user, 0.0% of total elapsed
> Date: Wed, 20 Mar 2013 08:04:01 +0200
> From: to.darkangel at gmail.com
> To: bmaxa at hotmail.com
> CC: haskell-cafe at haskell.org
> Subject: Re: [Haskell-cafe] Streaming bytes and performance
> 
> On 03/20/2013 12:47 AM, Branimir Maksimovic wrote:
> > Your problem is that main_6 thunks 'i' and 'a' .
> > If you write (S6 !i !a) <- get
> > than there is no problem any more...
> >
> 
> Nope :( Unfortunately that doesn't change anything. Still allocating...
> 
 		 	   		  
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