1. `clock_gettime()` is not meant to be precise, and it shouldn't be,
because the extra accuracy is useless. (It may make some sense for
logging, as mentioned in another message; but in logs only the order
of writes matters, while timestamps don't matter.)
I don't agree with this. First: precision and accuracy are two entirely
different things so it's important not to use them interchangeably. It
is true that the absolute value of the wall clock time is not likely to
be very accurate. If you are interested in the absolute value then
increasing precision in clock_gettime() is not going to help you. But
if you are interested in the relative difference between two consecutive
wall clock times then high precision is useful. Log timestamps are an
excellent example of this. I probably won't care if event 1 happened at
exactly 10:28:16.594. However I will likely care very much about the
precision of the interval between event 1 and event 2. I don't
understand your claim that only the order of writes matters in logs. If
that were true then we wouldn't use timestamps at all.
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