Perhaps I shouldn't have tried to do anything on this front, given the cross-system difficulties that especially David has battled for years. I'm surprised Aleksey is not a fan - I expected Aleksey to want a version of nanoTime more suitable for benchmarking.
I learned about the various "clocks" on linux/posix. I'm surprised the low-level CLOCKs also promise monotonicity (CLOCK_MONOTONIC). Perhaps what was really originally intended was that CLOCK_MONOTONIC was immune to the effects of sysadmin action (and also adjustments by NTP would be gradual and preserve monotonicity). Anyways, having a version of nanoTime that does not promise monotonicity is only useful if there is a significant benefit, probably in reduced overhead. No consensus - giving up.
