[Haskell-cafe] Re[2]: [Haskell] Google Summer of Code

[Bulat Ziganshin]

Hello John,

Wednesday, February 11, 2009, 8:54:35 PM, you wrote:

> I know you've talked about performance in the past, and I don't want
> to start a huge argument, but do you have recent data to back this up?
>  IIRC you're using ghc 6.6, yes?

i don't seen examples of high-performance code written by anyone else
which would be as simple and as fast as C analogue. afaik ghc now can
generate good code for tight loops, but gcc optimizations goes far
beyond this. if you know specialists writing HP code in haskell and
results of their work - please point us to these code

> I haven't looked at H.264 (and I realize it's compressed, so the
> situation is different from my work), however ghc can generate very
> fast code for binary I/O

it's exactly example of tight loop. and let's compare HP code written
for this task with analogous code written in C. i expect that haskell
code is much more complex

> .    Check out (shameless self-promotion)
> http://johnlato.blogspot.com for my recent writeup on creating a
> high-performance, pure-Haskell, Iteratee-based WAVE file reader.

afaiu, it's 20-line equivalent of 2-line C code:

for (i=...)
  a[i] = b[i]

does this need any more comments?

unfortunately, your post doesn't contain equivalent C code and its
performance measurements, so i can't consider this as argument for
ghc/gcc comparison. all that i see there is large complex code that
proves that HP haskell programming is much more complex than C one

> Sincerely,
> John Lato

>>
>> anyway it's impossible due to slow code generated by ghc
>>
>>
>> --
>> Best regards,
>>  Bulat                            mailto:Bulat.Ziganshin at gmail.com
>>


-- 
Best regards,
 Bulat                            mailto:Bulat.Ziganshin at gmail.com