Test technical training: How to test disk write Speed 2

5. The program is implemented as follows (very simple, no longer explained):

WriteFileDemo.cpp: Defines the entry point of the console application.

//

#include "stdafx.h"

#include <iostream>

#include <fstream>

using namespace Std;

#include <windows.h>

#include <WinBase.h>

#include <ctime>

Target Write file

Const char* G_psoutfile = "D:\\test_file\\1.txt";

Buffer size for one write

Const long write_buff_size = 10*1024*1024; 300MB bytes

Number of writes

#define MAX_WRITE_CNT 5

Buffer each byte is initialized to the ' a ' character

void Initbuf (char* pszbuf, int icnt)

{

for (int i = 0; i < icnt; ++i)

{

Pszbuf[i] = 97;

}

}

Loop Write file

void Writefilefun (char* szbuf)

{

Ofstream ofout (G_psoutfile);

int i = 0;

while (I < max_write_cnt)

{

Ofout << szbuf << Endl;

++i;

}

}

Test Write disk speed

void Writefiletestfun ()

{

Heap memory request, obviously stack memory inappropriate

char* sztenmbbuf = (char*) malloc (write_buff_size);

(void) Initbuf (sztenmbbuf, write_buff_size);

size_t nbeginticks = GetTickCount ();

cout << "BeginTime =" << nbeginticks << Endl;

(void) Writefilefun (SZTENMBBUF);

size_t nendticks = GetTickCount ();

cout << "EndTime =" << nendticks << Endl;

size_t Nspan = nendticks-nbeginticks;

cout << "nspantime =" << nspan << "MS" << Endl; Ms

float ntotalbytes = write_buff_size*max_write_cnt; Total number of bytes written

float ntotaltimes = (float) (nspan)/1000.0f; Total time spent, unit s

cout << "ntotalwritebytes =" << ntotalbytes << Endl;

cout << "ntotaltimes =" << ntotaltimes << Endl;

float fspeed = ntotalbytes/ntotaltimes;

cout << "Speed =" << fspeed << "byte/s" << Endl; Write Speed byte/s

cout << "Speed =" << fspeed/1024.0f/1024.0f << "MB/S" << Endl; Write Speed mbyte/s

if (NULL! = sztenmbbuf)

{

Free (SZTENMBBUF);

Sztenmbbuf = NULL;

}

}

int _tmain (int argc, _tchar* argv[])

{

(void) writefiletestfun ();

return 0;

}

Test technical training: How to test disk write Speed 2