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I'm at the beginning with C++ and sometimes I don't know how much my compiler will like two different implementation of an alghoritm. Is there a simple tool I can use to see how much time takes my code to execute?
EDIT: Im using gcc compiler
If you want to mesure how long the entire program run's, then Code-Blocks/Visual studio should tell you when the program closes. It should be in the log at the bottom.
If you want to mesure how long a specific line, or function takes, I would suggjest researching
clock() or QueryPerformanceFrequency() and how to use them.
the clock() function is slow, but it's easyer to use. an example:
float start_time = clock()/CLOCKS_PER_SEC;
func();
float end_time = clock()/CLOCKS_PER_SEC;
float dtime = start_time - end_time;
I have had very good experience with AQtime from Smart Bear, it is not free, but you can get a free trial. It integrates really well into Visual C++ and RAD Studio from Embarcardero.
http://smartbear.com/products/qa-tools/application-performance-profiling
The data is easily accessible in the IDE, and especially the hit count and time spent numbers in the gutter section, next to the line numbers is useful.
来源：https://stackoverflow.com/questions/15167544/c-profiler-on-windows