[Haskell-cafe] speed: ghc vs gcc

[Miguel Mitrofanov]

Ahem. Seems like you've included time spent on the runtime loading.

My results:

MigMit:~ MigMit$ gcc -o test -O3 -funroll-loops test.c && time ./test
-1243309312
real	0m0.066s
user	0m0.063s
sys	0m0.002s
MigMit:~ MigMit$ rm test; ghc -O2 --make test.hs && time ./test
Linking test ...
-243309312

real	0m3.201s
user	0m3.165s
sys	0m0.017s

While 3.201 vs. 0.066 seem to be a huge difference, 0.017 vs. 0.002 is  
not that bad.

On 20 Feb 2009, at 16:29, Bulat Ziganshin wrote:

> Hello haskell-cafe,
>
> since there are no objective tests comparing ghc to gcc, i made my own
> one. these are 3 programs, calculating sum in c++ and haskell:
>
> main = print $ sum[1..10^9::Int]
>
>
> main = print $ sum0 (10^9) 0
>
> sum0 :: Int -> Int -> Int
> sum0 0  !acc = acc
> sum0 !x !acc = sum0 (x-1) (acc+x)
>
>
> main()
> {
>  int sum=0;
>  //for(int j=0; j<100;j++)
>    for(int i=0; i<1000*1000*1000;i++)
>      sum += i;
>  return sum;
> }
>
> execution times:
> sum:
>   ghc 6.6.1 -O2               : 12.433 secs
>   ghc 6.10.1 -O2              : 12.792 secs
> sum-fast:
>   ghc 6.6.1 -O2               :  1.919 secs
>   ghc 6.10.1 -O2              :  1.856 secs
>   ghc 6.10.1 -O2 -fvia-C      :  1.966 secs
> C++:
>   gcc 3.4.5 -O3 -funroll-loops:  0.062 secs
>
>
> -- 
> Best regards,
> Bulat                          mailto:Bulat.Ziganshin at gmail.com
>
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