vs2010 在函數級別設置優化

平時開發的時候,爲了方便調試,visual studio 的Configuration 設置成Release。ide

同時爲了過後調試,Optimization老是設置成Disabled。這樣作是方便查看變量的數值。函數

但遇到計算密集的功能實現,優化關閉仍是挺費時間的。性能

void calc(int nMax)
{
    int nTotal = 0;
    for (int index = 0;index < nMax;index++)
    {
        nTotal = 0;
        for (int subIndex = index;subIndex < nMax+index;subIndex++ )
        {
            nTotal += subIndex;
        }
    }
}

  

 

最初個人想法是project的優化關閉,相關文件的優化打開,測試後發現沒有什麼做用。測試

Untitled

參考visual studio的幫助後,發現能夠針對函數進行優化。優化

這樣作考慮其餘方法依舊能夠過後調試。調試

在函數先後增長  #pragma optimize便可orm

#pragma optimize( "gs", on )
void calc(int nMax)
{
    int nTotal = 0;
    for (int index = 0;index < nMax;index++)
    {
        nTotal = 0;
        for (int subIndex = index;subIndex < nMax+index;subIndex++ )
        {
            nTotal += subIndex;
        }
    }
}
#pragma optimize( "gs",  off )

  

通過測試,針對函數的優化,性能和project優化至關。blog

未優化前:0.67秒開發

優化後:0.00秒get

 

這樣之後過後調試仍是很方便的。

 

測試環境:

ide:vs2010

項目:console

Configuration :Release。

Optimization:Disabled

實現代碼:

 

#include "stdafx.h"
#include <Windows.h>

#pragma optimize( "gs", on )
void calc(int nMax)
{
    int nTotal = 0;
    for (int index = 0;index < nMax;index++)
    {
        nTotal = 0;
        for (int subIndex = index;subIndex < nMax+index;subIndex++ )
        {
            nTotal += subIndex;
        }
    }
}
#pragma optimize( "gs",  off )


void retry(int nMin)
{
    int nTry = 0;
    nTry = nMin;
}

int _tmain(int argc, _TCHAR* argv[])
{
    LARGE_INTEGER	freq				= {0};			
    LARGE_INTEGER	beginPerformanceCount	= {0};
    LARGE_INTEGER	closePerformanceCount	= {0};

    QueryPerformanceFrequency(&freq);

    QueryPerformanceCounter(&beginPerformanceCount);
    calc(10000);
    QueryPerformanceCounter(&closePerformanceCount);

    retry(2020);
    double delta_seconds = (double)(closePerformanceCount.QuadPart - beginPerformanceCount.QuadPart) / freq.QuadPart;
    printf("%f",delta_seconds);
    getchar();
	return 0;
}

  

 

相關連接:

https://msdn.microsoft.com/en-us/library/chh3fb0k(v=vs.100).aspx

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