Is any high resolution timer available on a Raspberry Pi that can be used by an application (for micro-benchmarking, etc.) without having to write a kernel driver?
The resolution I'm looking for is sub-millisecond or microseconds, but microseconds or nanoseconds are preferred. For timing compiled C vs. ARM assembly language code. Added jitter to ameliorate Spectre is OK.
You should be able to check for high-resolution timer support by installing the rt-tests package and running cyclictest with the period that you're interested in. For example
cyclictest -n -p 80 -i 500 -l 5000
This does a test of
clock_nanosleep(), with priority 80, at 500 microsecond intervals, running the 5000 iterations of the test.
According to a brief search, nanosleep() is supported in Raspbian.
Another source of useful information about available timers is /proc/timer_list.
