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@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: [email protected]
> To: [email protected]
> CC: [email protected]
> 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...
>
_______________________________________________
Haskell-Cafe mailing list
[email protected]
http://www.haskell.org/mailman/listinfo/haskell-cafe
