Hello and happy new year,
> -l [...]
My 0.02€:
> There are at least three ways we could fix it:
>
> 1. Switch over to printing the timestamp in the form of elapsed seconds
> since the pgbench run start, [...] About the only reason I can see for
> liking the current definition is that it makes it possible to correlate
> the pgbench log with external events, and I'm not sure whether that's
> especially useful.
I have found that the ability to correlate different logs, esp. pgbench
and postgres, is "sometimes" useful.
> 2. Have pgbench save both the INSTR_TIME_SET_CURRENT() and
> gettimeofday() results for the run start instant. However, it's got a
> nasty problem [...]
I'm not sure how wide the problem would be. I would not expect the
correlation to be perfect, as there are various protocol/client overheads
here and there anyway.
> 3. Forget about using the instr_time result and just have doLog() execute
> gettimeofday() to obtain the timestamp to print. This is kind of
> conceptually ugly, but realistically the added overhead is probably
> insignificant. A larger objection might be that on Windows, the result
> of gettimeofday() isn't very high precision ... but it'd still be a huge
> improvement over the non-answer you get now.
Yep.
> I'm inclined to think that #2 isn't a very good choice; it appears to
> preserve the current behavior but really doesn't. So we should either
> change the behavior as in #1 or expend an extra system call as in #3.
> Preferences?
Marginal preference for #3 for KIS? Otherwise any three options seems
better than the current status.
--
Fabien.
