Difference in accuracy between gettickcount and queryperformancecounter

Source: Internet
Author: User

In fact, the difference is not big. I wrote two classes for testing:

 

Class timecounter

{

PRIVATE:

DWORD start;

Public:

Timecounter () {start ();}

Void start () {start = gettickcount ();}

DWORD now ()

{

DWORD end = gettickcount ();

Return (end-Start); // return miliseconds

}

};

 

 

Class highresolutiontimecounter

{

Large_integer start;

Large_integer freq;

Public:

Highresolutiontimecounter () {queryperformancefrequency (& freq); Start ();}

Void start () {queryperformancecounter (& START );}

_ Int64 now () // return miliseconds

{

Large_integer end = {0 };

Queryperformancecounter (& End );

Return (end. quadpart-start. quadpart) * 1000/freq. quadpart;

}

};

 

Test code:

Timecounter TC;

Highresolutiontimecounter hrtc;

 

Sleep (10*1000 );

 

Cout <TC. Now () <Endl;

Cout

 

The final result is slightly different.

 

 

 

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