On Thu, Apr 07, 2022 at 03:14:01PM +0800, Julien Rouhaud wrote: > Sure, but gettimeofday() has been implemented in vDSO for quite some time on > most platforms, so it shouldn't hurt that much on mainstream platforms > especially compared to the cost of whatever operation is actually using that > temporary file. > > I don't think that having an extra GUC for temp IO is sensible, if that's why > you're suggesting? Or are you just asking to do some benchmarking on some > platform where getting the time is known to be slow (Windows?).
I am asking about the latter, but the former could be one solution if the latter proves to be a problem, and this has not been discussed on the thread yet. So, with some kind of worst-case scenario, how much worse the performance gets once you add those extra calls when compared to HEAD? I think that we'd better be careful with any additions of INSTR_TIME_SET_CURRENT(). -- Michael
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