Slower than Python

[Andrei Alexandrescu]

On 3/1/13 3:58 PM, 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

Also, the D version has a different string to parse (~ is not a line 
continuation character). The fixed version:

    auto message = "REGISTER sip:example.com SIP/2.0\r
Content-Length: 0\r
Contact:
<sip:12345 at 10.1.3.114:59788;transport=tls>;expires=4294967295;events=\"message-summaryq\";q=0.9\r
To: <sip:12345 at comm.example.com>\r
User-Agent: (\"VENDOR=MyCompany\" \"My User Agent\")\r
Max-Forwards: 70\r
CSeq: 1 REGISTER\r
Via: SIP/2.0/TLS
10.1.3.114:59788;branch=z9hG4bK2910497772630690\r
Call-ID: 2910497622026445\r
From: <sip:12345 at comm.example.com>;tag=2910497618150713\r\n\r\n";

That shaves one extra second bringing it down to 9.


Andrei