[Haskell-cafe] speed: ghc vs gcc

[Miguel Mitrofanov]

Forget it, my bad.

On 20 Feb 2009, at 16:48, Miguel Mitrofanov wrote:

> 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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>
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