How to check the working time of application?

Question

How can I check the evaluation processing time of my application. For example how many time it needs to do A, B, C, A+C, B+C, ...

Keep a set of counter variables and increment them whenever you do an operation you want to track? — millimoose, Sep 18 '13 at 15:00
Are you actually looking to measure the time of the whole application, a part of the application, or do you want to measure how many times it does a certain thing (function or instruction)? — Mats Petersson, Sep 18 '13 at 15:02
@Mats Petersson as you can see from my question I want to measure time for every combination of operations I am interested in. The whole working time is just combination off everything. — Mike, Sep 18 '13 at 15:07
Parts of program - for example let A be the time that program spends to load a file, B - the time that program spends to apply some algorithm on the loaded file, C - the time to execute — Mike, Sep 18 '13 at 15:14

score 0 · Answer 1 · edited May 23 '17 at 10:25

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You could use gettimeofday() and use the timersub() function to get the difference.
You could use clock() and subtract the two times. Remember to #include .

-Referenced from:

How to subtract two gettimeofday instances?

http://www.cplusplus.com/forum/unices/50561/

What is the best, most accurate timer in C++?

EDIT: Another option is chrono i/o. Gives very high precision. http://howardhinnant.github.io/duration_io/chrono_io.html

edited May 23 '17 at 10:25

Community

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answered Sep 18 '13 at 15:28

philhan

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What if I need accuracy with milliseconds? – Mike Sep 18 '13 at 17:37
another option for more resolution is chrono i/o. http://home.roadrunner.com/~hinnant/duration_io/chrono_io.html – philhan Sep 18 '13 at 19:08
@philhan just updated that link to its new home – sehe Jan 10 '15 at 21:38

score 0 · Answer 2 · answered Sep 18 '13 at 15:47

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If you use linux. Command 'time' can help you:

$time ./a.out 

real    0m0.137s
user    0m0.001s
sys     0m0.001s

answered Sep 18 '13 at 15:47

Spoonwalker Highwater

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Then you should read this: http://stackoverflow.com/questions/673523/how-to-measure-execution-time-of-command-in-windows-command-line – Spoonwalker Highwater Sep 19 '13 at 02:37

score 0 · Answer 3 · answered Sep 18 '13 at 19:20

Use QueryPerformanceCounter().

LARGE_INTEGER s, e, f;

QueryPerformanceFrequency( &f );
QueryPerformanceCounter( &s );

// TO DO: add your code here

QueryPerformanceCounter( &e );


const __int64 durationMilliseconds = ( e.QuadPart - s.QuadPart ) * 1000 / f.QuadPart;

How to check the working time of application?

3 Answers3