CODEWITHSUNDEEP
visual-studio-2010visual-studiovisual-c++mfcvisual-c++-2010
user13267
user13267

Reputation: 7193

determine the time taken for my code to execute in MFC

I need a way to find out the amount of time taken by a function, and a section of my code inside a function, to execute
Does Visual Studio provide any mechanism for doing this, or is it possible to do so from the program using MFC functions? I am new to MFC so I am not sure how this can be done. I thought this should be a pretty straight forward operation but I cannot find any examples on how this may be done either

Upvotes: 0

Views: 1197

Answers (2)

MikMik
MikMik

Reputation: 3466

A quick way, but quite imprecise, is by using GetTickCount():

DWORD time1 = GetTickCount();

// Code to profile

DWORD time2 = GetTickCount();

DWORD timeElapsed = time2-time1;

The problem is GetTickCount() uses the system timer, which has a typical resolution of 10 - 15 ms. So it is only useful with long computations.

It can't tell the difference between a function that takes 2 ms to run and one that takes 9 ms. But if you are in the seconds range, it may well be enough.

If you need more resolution, you can use the performance counter, as RedEye explains.

Or you can try a profiler (maybe this is what you were looking for?). See this question.

Upvotes: 3

Redeye
Redeye

Reputation: 1602

There may be better ways, but I do it like this :

// At the start of the function
LARGE_INTEGER lStart;
QueryPerformanceCounter(&lStart);
LARGE_INTEGER lFreq;
QueryPerformanceFrequency(&lFreq);

// At the en of the function
LARGE_INTEGER lEnd;
QueryPerformanceCounter(&lEnd);
TRACE("FunctionName t = %dms\n", (1000*(lEnd.LowPart - lStart.LowPart))/lFreq.LowPart);

I use this method quite a lot for optimising graphics code, finding time taken for screen updates etc. There are other methods of doing the same or similar, but this is quick and simple.

Upvotes: 2

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