Programming

Hi,

I need to time a certain function in my C/C++ code and I am experiencing some difficulties. I timed it using wallclock time so I know that it takes approximately 500-600 microseconds with

gettimeofday(&start, NULL);
// my function call
gettimeofday(&end, NULL);
answer = (end.tv_sec - start.tv_sec)*1000000 + (end.tv_usec - start.tv_usec);

What I actually need is to get the CPU time used for this function. Unfortunately, the widely used clock() function does not give me a good precision because well... clock_t/CLOCKS_PER_SEC is in seconds.

Anyone had a similar problem? Thank you in advance.

Note: I couldn't find anything relevant on the Unix man pages or anywhere on this forum but it's always possible that I have overlooked...

man getitimer
I think this will do what you want. But I've never used it except with ITIMER_REAL.

Thanks for the quick pointer. I will look into it.