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perf_counter_ns
def perf_counter_ns() -> Int
Return the value (in nanoseconds) of a performance counter, i.e. a clock with the highest available resolution to measure a short duration. It does include time elapsed during sleep and is system-wide. The reference point of the returned value is undefined, so that only the difference between the results of two calls is valid.
Returns:
Int: The current time in ns.