Slower than Python

[cvk012c]

On Friday, 1 March 2013 at 20:58:09 UTC, simendsjo wrote:
> On Friday, 1 March 2013 at 20:50:15 UTC, Andrei Alexandrescu 
> wrote:
>> On 3/1/13 3:30 PM, cvk012c wrote:
>>> Tried to port my SIP parser from Python to D to boost 
>>> performance
>>> but got opposite result.
>>> I created a simple test script which splits SIP REGISTER 
>>> message
>>> 10 million times. Python version takes about 14 seconds to
>>> execute, D version is about 23 seconds which is 1.6 times 
>>> slower.
>>> I used DMD 2.062 and compiled my script with options -release 
>>> and
>>> -O. I used Python 3.3 64 bit.
>>> I ran both scripts on the same hardware with Windows 7 64.
>>
>> Add -inline to the options.
>>
>> Andrei
>
> --noboundscheck can also help if you don't mind missing the 
> safety net.
>
> $ rdmd -O -release sip
> 22 secs, 977 ms, 299 μs, and 8 hnsecs
> $ rdmd -O -release -inline sip
> 12 secs, 245 ms, 567 μs, and 9 hnsecs
> $ rdmd -O -release -inline -noboundscheck sip
> 10 secs, 171 ms, 209 μs, and 9 hnsecs


On my hardware with -inline options it now takes about 15 secs 
which is still slower than Python but with both -inline and 
-noboundscheck it takes 13 secs and finally beats Python.
But I still kind of disappointed because I expected a much better 
performance boost and got only 7%. Counting that Python is not 
the fastest scripting language I think that similar Perl and Java 
scripts will outperform D easily.
Thanks Andrei and simendsjo for a quick response though.