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:[email protected]:59788;transport=tls>;expires=4294967295;events=\"message-summaryq\";q=0.9\r
To: <sip:[email protected]>\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:[email protected]>;tag=2910497618150713\r\n\r\n";
That shaves one extra second bringing it down to 9.
Andrei
