Qt字符串和java字符串的split方法比较和python的解析比较

        早起闲的没事，做了一个测试，有关Qt string 与java string 性能比较的测试，测试的数据源是RFC 3261的一个报文，把其按照"\r\n"进行解析。分别用了java的String.split方法和QString的split方法，当然这个测试可能比较片面，无法反应真实的2者性能差距，但测试结果也是很有意思 

硬件平台 I5 2.3 GHz DDR3 1600MHz

Mac OS 10.7.2

java 1.6.0_33

Qt: 4.7.4

代码如下：

public class myClass

{

    public static String recvMsg = "INVITE sip:[e-mail] SIP/2.0\r\n" +

            "Via: SIP/2.0/UDP pc33.atlanta.com;branch=z9hG4bK776asdhds\r\n" +

            "Max-Forwards: 70\r\n" +

            "To: Bob <sip:[e-mail]>\r\n" +

            "From: Alice <sip:[e-mail]>;tag=1928301774\r\n" +

            "Call-ID: [e-mail]\r\n" +

            "CSeq: 314159 INVITE\r\n" +

            "Contact: <sip:[e-mail]>\r\n" +

            "Content-Type: application/sdp\r\n" +

            "Content-Length: 142\r\n";

    public static void main(String [] args)

    {

        System.out.println("main function called");

        long startTime = System.currentTimeMillis();

        for ( int i = 0 ; i < 10000 * 1000 ; i ++ )

        {

            String [] result = recvMsg.split("\r\n");

            if ( result.length != 10 )

            {

                System.out.println("not 10 ");

                break;

            }

        }

        long endTime = System.currentTimeMillis();

        System.out.println("alltime  " + (endTime - startTime));

    }

}

测试的几次结果如下：

1） 40795 ms

2)   34476 ms

3)  32886 ms

4)  41293 ms

#include <QtCore/QCoreApplication>

#include <QtCore/QTime>

#include <QtCore/QStringList>

#include <QtCore/QDebug>

int main(int argc, char *argv[])

{

    QCoreApplication a(argc, argv);

    QString recvMsg =  "INVITE sip:[e-mail] SIP/2.0\r\n"\

            "Via: SIP/2.0/UDP pc33.atlanta.com;branch=z9hG4bK776asdhds\r\n"\

            "Max-Forwards: 70\r\n" \

            "To: Bob <sip:[e-mail]>\r\n" \

            "From: Alice <sip:[e-mail]>;tag=1928301774\r\n"\

            "Call-ID: [e-mail]\r\n" \

            "CSeq: 314159 INVITE\r\n" \

            "Contact: <sip:[e-mail]>\r\n" \

            "Content-Type: application/sdp\r\n" \

            "Content-Length: 142\r\n";

    QTime startTime = QTime::currentTime();

    for ( int i = 0 ; i < 1000*10000; i ++ )

    {

        const QStringList & result = recvMsg.split("\r\n"); //为了提高效率，采用引用

        if ( result.size() != 11 ) //QString.split会有一个空白字符被解析出来，所以数组内多一个value

        {

            qDebug()<< "decode error"<<result.size();

            break;

        }

    }

     QTime endTime = QTime::currentTime();

     qDebug()<<" all time "<< startTime.msecsTo(endTime);

    return a.exec();

}

编译为release版本，测试结果如下：

1） 39132 ms

2)    41153 ms

3)    40572 ms

4)    39043 ms

    直观上看，QString的性能比java String的性能要差 

from PyQt4.QtCore import *


sipMsg = "INVITE sip:[e-mail] SIP/2.0\r\n" \
         "Via: SIP/2.0/UDP pc33.atlanta.com;branch=z9hG4bK776asdhds\r\n" \
         "Max-Forwards: 70\r\n" \
         "To: Bob <sip:[e-mail]>\r\n" \
         "From: Alice <sip:[e-mail]>;tag=1928301774\r\n" \
         "Call-ID: [e-mail]\r\n" \
         "CSeq: 314159 INVITE\r\n" \
         "Contact: <sip:[e-mail]>\r\n" \
         "Content-Type: application/sdp\r\n" \
         "Content-Length: 142\r\n"


if __name__ == "__main__":
    import sys
    startTime = QTime.currentTime()
    count = 1000*1000
    while count > 0:
        count = count - 1
        result = sipMsg.split("\r\n")
        if len(result) != 11:
            print "error"
    endTime = QTime.currentTime()
    print startTime.msecsTo(endTime)

最后测试了一下python,速度很快阿

/usr/local/bin/python /t2/main.py
1730