[Haskell-cafe] #haskell works
andrewcoppin at btinternet.com
Sat Dec 15 07:15:28 EST 2007
Paul Johnson wrote:
> Andrew Coppin wrote:
>> Program with no particular optimisations: 0.35 seconds.
>> Program with stream fusion [and GHC HEAD]: 0.25 seconds.
>> Program with stream fusion and ByteString: 0.05 seconds.
>> Surely you'd have to work pretty hard to get that kind of speed even
>> in C. ;-)
>> ...erm, actually no. Somebody sat down and wrote something in five
>> minutes that takes 0.005 seconds. Oops!
> You may also be paying a fixed cost penalty in GHC run-time
> initialization. Try increasing N and see what happens.
Yeah. Hence the "we should use something that takes tens of seconds". ;-)
(I suppose I could try writing a nop program and timing it. But
personally I don't have any way of timing things to that degree of
accuracy. I understand there are command line tools on Unix that will do
it, but not here.)
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