estimating processing time

[astromonkey]

I'm trying to estimate the processing time of a set of functions written in C. Are there any hints out there for counting flops?

Thanks,
astromonkey

[Valmont]

How accurate do you want it to be?

You can have my code. It is up to 10 micro-seconds accurate, meant to replace the standard profiling utilites usually found on IDE's.

Made for win32 systems, but not all too hard to port.

I can do better, up to about 100 cpu instructions. But you have to give me a reason to invest time. I'm busy and moving away from C++ and assembly.

[astromonkey]

Valmont,

That's the real question isn't it!

I am currently counting it by hand by adding up all of the *,/,++,--,+,-,cos,sin,sqrt operations. It doesn't count any time required to step into and out of functions and it's quite tedious. I have a fairly safe margin of error in terms of a processing budget so a relatively accurate guess is all that is needed.


Thanks,
astromonkey

[Valmont]

Oopsy, I forgot to send the code. It contains a sample as well. Have fun with it.
*edit*
Erratic behaviour by site.

http://home.tiscali.nl/~valmont/cpp/...s/profiler.zip

[Valmont]

Valmont,

That's the real question isn't it!

Yes, that's the question indeed. If you are interested in testing then make a plan. You'll notice you will find the answers, instead of bouncing the question back.

[astromonkey]

Thank you for your quick responses.

[Valmont]

Uhm. I suddenly realize my code might be a tad too much. I didn't know where you stood from reading the first post.
Start with this:

#include <iostream>
#include <ctime>
using namespace std;

int main(int argc, char* argv[])
{
	clock_t start, end;
	long double duration;
	start=clock();
	//TODO: code to test here.
	end=clock();
	duration=(long double)(end-start)/CLOCKS_PER_SEC;
	cout<<"Elapsed time: "<<duration<<endl;

	return 0;	
}