Tommy Liang — Sat, 01 Apr 2006 03:10:00 GMT

《windows囑�Ş�~�程》有�Ԍ��

KTimer.h

#pragma once
inline unsigned __int64 GetCycleCount( void )
{
    _asm _emit 0x0F
    _asm _emit 0x31
}

class KTimer
{
    unsigned __int64 m_startcycle;
public :
    unsigned __int64 m_overhead;     // RTSC指��o的运行时�?/span>

    KTimer()
     {
        m_overhead = 0 ;
        Start();
        m_overhead = Stop();
    }
     void Start();
    unsigned __int64 Stop();
    unsigned unsigned GetCPUSpeed();

} ;

KTimer.cpp

#include "KTimer.h"

#include <iostream>
#include <windows.h>

void KTimer::Start()
{
    m_startcycle = GetCycleCount();
}
unsigned __int64 KTimer::Stop()
{
    return GetCycleCount() - m_startcycle - m_overhead;
}
unsigned unsigned KTimer::GetCPUSpeed()
{
    cout << "开始测试 cpu速度.." << endl;
    Start();
    Sleep(1000);
    unsigned cputime = Stop();
    unsigned cpuspeed10 = (unsigned)(cputime/100000);
    cout << "CPU速度每秒:" << cputime << " clocks" << endl;
    return cpuspeed10 == 0 ? 1 : cpuspeed10;
}

用法�Q?br />

#include "stdafx.h"
#include <tchar.h>
#include <windows.h>
#include <iostream>

#include "KTimer.h"

int main(int argc, char* argv[])
{
    KTimer timer;

    unsigned cpuspeed10 = timer.GetCPUSpeed();

    timer.Start();

//做耗时操作

    unsigned time = timer.Stop();

    TCHAR mess[128];
    wsprintf(mess,_T("耗时:%d ns"), time * 10000 / cpuspeed10);
    cout << mess << endl;

    return 0;
}

Tommy Liang 2006-04-01 11:10 发表评论

Tommy Liang — Mon, 06 Feb 2006 01:49:00 GMT

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5、事�?nbsp; 如对通信�U��\的布�U�从而高效地处理通信�Q�对市场购销现金��的监测以便加强对市场实际情�늚�了解�?BR>6、匹�?nbsp; 如应聘�h员与单位机构的匹�?BR>7、网�l?nbsp; 计算机网�l�的�l�护�Q�如何调整节点以便确保某些站�Ҏ��q�接不至于处于太“要害”的��C��?BR>8、程序结�?nbsp; 如何最佛_��为程序分配资源以便做到最高效�Q?BR>

值得研究�?img src ="http://www.shnenglu.com/tommy/aggbug/3084.html" width = "1" height = "1" />

Tommy Liang 2006-02-06 09:49 发表评论

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