On Tue, Dec 29, 2020 at 04:16:06PM -0500, Tom Lane wrote: > Hmph, no, a look at explain.c shows that the "Execution Time" is just > based on the difference of INSTR_TIME_SET_CURRENT measurements taken > within the current process. It's difficult to conclude anything except > that the clock went backwards. Which is weird, because according to [1] > that system does have clock_gettime(CLOCK_MONOTONIC), which'd be our > preferred choice of INSTR_TIME time base; and such clocks are not > supposed to go backwards ever.
I was looking at that, and I agree that this looks like a monotonic clock going backwards. Or could it be possible that it gave 0.0 as result, still a minus sign was appended? That would mean an execution that took less than 1us per the system clock. -- Michael
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