On 2/9/09, Bulat Ziganshin
Hello Tim,
Monday, February 9, 2009, 11:16:22 PM, you wrote:
So is the PPC backend really this bad, or should I be looking for something weird with the hardware or configuration on the Mac?
check GC times too. one possibility is that GC takes much more time due to smaller L2 cache
Hmm, doesn't seem to be happening with this example. On the Mac, I get (running with +RTS -s -RTS): 11.86 MUT time (13.95s elapsed) 0.08s GC time (0.15s elapsed) %GC time 0.6% (1.1% elapsed) and on the PC: 1.07s MUT time (1.34s elapsed) 0.01s GC time (0.02s elapsed) %GC time 1.1% (1.6% elapsed) so GC doesn't seem to explain the large difference in running times. Cheers, Tim -- Tim Chevalier * http://cs.pdx.edu/~tjc * Often in error, never in doubt "Maybe I don't want to meet someone who shares my interests. I hate my interests." -- Ghost World