Is clock_gettime() adequate for submicrosecond timing?

Question

I need a high-resolution timer for the embedded profiler in the Linux build of our application. Our profiler measures scopes as small as individual functions, so it needs a

Answer 1

I need a high-resolution timer for the embedded profiler in the Linux build of our application. Our profiler measures scopes as small as individual functions, so it needs a timer precision of better than 25 nanoseconds.

Have you considered oprofile or perf? You can use the performance counter hardware on your CPU to get profiling data without adding instrumentation to the code itself. You can see data per-function, or even per-line-of-code. The "only" drawback is that it won't measure wall clock time consumed, it will measure CPU time consumed, so it's not appropriate for all investigations.