Algorithm Research-CPU usage Curve

1. The CPU usage curve is a sine function curve:

Step 1: To set the CPU usage curve to a function curve, first understand the relationship between the Function Curve and the CPU usage curve. Function y = f (x ), corresponding to the CPU usage curve, x indicates the elapsed time, and y indicates the CPU usage. We know that the CPU usage is 0%-100%, that is to say, the value range of the function is [0-1], but the value range of the sine function is [-]. Therefore, the sine function must be transformed to []. after y = 1/2 + 1/2sinx transformation, the value range is.

Step 2: For CPU usage y = 1/2 + 1/2 * sinx, that is to say, at a certain time point x, the CPU usage time is the ratio of busy time to total time y;

By following these two points, the algorithm for calculating the CPU usage curve as the sine function curve can be easily solved.

 

The Code is as follows:

# Include "Windows. h"

# Include "stdlib. h"

# Include "math. h"

 

Constdouble SPLIT = 0.01;

Const int COUNT = 100;

Const double PI = 3.14159265;

Const int INTERVAL = 300;

 

Int main ()

{

DWORD busySpan [COUNT];

DWORD idleSpan [COUNT];

Int half = INTERVAL/2;

Double radian = 0.0;

For (int I = 0; I <COUNT; I ++)

{

BusySpan [I] = DWORD (half + half * sin (PI * radian); // y = 1/2 + 1/2 * (sinx)

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;

}