How to do profiling in c++

[shivamskn]

I've to measure the time taken by a c++ program to execute and also the number of clock cycles that were required to do so. Please help fast I've a deadline to meet.

Thanks in advance

[binaryHex]

Use the ctime library for clocks. The code below has not been compiled.

#include<iostream>
#include<ctime>

using namespace std;

int main()
{
    const float clk_strt = float( clock() );

    for(int i = 0; i < 100; i++ )
            cout<<i<<" ";

    const float clk_end = float ( clock() );

   cout<<"\n\nThe number of ticks is taken to execute is: " << (clk_strt - clk_end) << endl;

   return 0;

}

[Lindley]

If you're on Linux, you can compile using the -pg option to generate a gprof file.

[salehhamadeh]

Use the ctime library for clocks. The code below has not been compiled.

#include<iostream>
#include<ctime>

using namespace std;

int main()
{
    const float clk_strt = float( clock() );

    for(int i = 0; i < 100; i++ )
            cout<<i<<" ";

    const float clk_end = float ( clock() );

   cout<<"\n\nThe number of ticks is taken to execute is: " << (clk_strt - clk_end) << endl;

   return 0;

}

To get the ticks taken to execute you must use (clk_end - clk_strt) and not the opposite.

[shivamskn]

thanks guys for replying..... Am working on winxp operating system and I use turbo C++. This clock() function will give me the number of cpu clock cycles or the actual time taken to execute?..... And further when I tried compiling this program the compiler was unable to include the ctime library, I got the same error in Visual C++ as well....

[salehhamadeh]

It compiles well on code::blocks.

[shivamskn]

k.... I've also downloaded code::blocks......Can u tell me how to proceed further to run the program like which compiler to select etc etc..... Also if u kno a way to do all this in turbo c++ only then please tell.........

[shivamskn]

hey salehhamadeh pls reply dude

[Philip Nicoletti]

In old compilers (like Turbo C++), you probably have to use time.h instead of ctime

#include <time.h>

[shivamskn]

thanks a lot philip..... It did work!!!!!![]

[Lindley]

Any compiler which doesn't support the C++ standard libraries is too old to be using. Ditch it.

[shivamskn]

yeah u r right.... Mah college forces me 2 use it

[salehhamadeh]

If you're forced to use it, then learning c would be better.