28 Jan
2009
28 Jan
'09
8:37 p.m.
On Wed, 2009-01-28 at 20:23 -0500, Ross Mellgren wrote:
Duncan, I think you must have some magics -- on my machine the original code also takes forever. Running with +RTS -S indicates it's allocating several gig of memory or more.
It runs in a tiny heap for me: ./circ2 +RTS -A10k -M20k -RTS 3141592653589764829 +RTS -S indicates it allocated 8,512 bytes.
Applying some bang patterns gives me ~8s for 10^8 and somewhat more than a minute for 10^9:
I wonder if it is the 64 vs 32 bit machine difference. I recall some ghc ticket about Int64 having rather poor performance on 32bit x86 machines. I don't have a 32bit x86 machine to hand so I cannot easily test it. Duncan