[ILUG] Measuring time

[Paul Kelly]

Anthony Harrington wrote:

> Can anyone tell me a system call for measuring time in nano-seconds ?


I don't believe there is one. The overhead of a syscall will affect your 
timing anyway. Your best bet is probably the TSC - a CPU register on 
i586 class CPUs. It's a counter increments every clock cycle, so the 
resolution - and the answer you get from it - depends on the clock speed 
of the CPU. Have a look in the source of UAE for an example of how to 
use it.

Not what you'd call portable, but it gets the job done.

Paul.