1th Chapter Game Music let the CPU occupancy curve listen to your command. Controlling CPU Utilization

1.1 Let the CPU usage curve listen to your command:

Solution One: Code Listing 1-1

int main ()

{

for (;;

{

The number of seconds a CPU executes

for (int i = 0; I <9600000; i++)

;

Sleep (10);

}

return 0;

}

Solution Two: Code Listing 1-2:

int busyTime = 10; Ten MS

int IdleTime =busytime; Same ratio'll lead to50% CPU usage

Int64 starttime = 0;

while (true)

{

StartTime = GetTickCount ();

Busy loop

while ((GetTickCount ()-starttime) <= busyTime)

;

Idle loop

Sleep (IdleTime);

Solution Three: The solution that can adapt dynamically

C # code

static void Makeusage (float level)

{

PerformanceCounter p = new PerformanceCounter ("Processor", "%processor Time", "_total");

if (p==null)

{

Return

}

while (true)

{

if (P.nextvalue () > Level)

System.Threading.Thread.Sleep (10);

}

Solution Four: Let the CPU appear as a sine curve

C + + code to Maketask Manager generate sine graph

#include "Windows.h"

#include "Stdlib.h"

#include "math.h"

const double split= 0.01;

const int COUNT = 200;

Const double PI = 3.14159265;

const int interval= 300;

int _tmain (INTARGC, _tchar* argv[])

{

DWORD Busyspan[count]; Array of busy times

DWORD Idlespan[count]; Array of idle times

int half = INTERVAL/2;

Double radian = 0.0;

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

{

Busyspan[i] = (DWORD) (Half + (sin (PI * radian) * half));

Idlespan[i] = Interval-busyspan[i];

Radian + = SPLIT;

}

DWORD starttime = 0;

int j = 0;

while (true)

{

j = j% COUNT;

StartTime = GetTickCount ();

while ((GetTickCount ()-StartTime) <= Busyspan[j])

;

Sleep (Idlespan[j]);

j + +;

}

return 0;

Summary: Invoke the Windows API implementation program to control CPU usage