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Robert SpeicherandRobert Speicher
a64b7cd3ba
Use clock_gettime for all performance timestamps
This MR adjusts the performance monitoring code to use `Process.clock_gettime` (thus `clock_gettime(3)`) instead of `Time.now`.
Using `Time.now` / `Time.new` adds more overhead than `Process.clock_gettime`, it also doesn't provide a way of getting timestamps in nanoseconds (which `Process.clock_gettime` does allow).
See merge request !4899
(cherry picked from commit 53ad9522c4)