On Thu, Jan 25, 2024 at 10:53:58AM +0800, jian he wrote: > apply your patch: > COPY data TO '/dev/null' WITH (FORMAT csv) \watch count=5 > Time: 668.996 ms > Time: 596.254 ms > Time: 592.723 ms > Time: 591.663 ms > Time: 590.803 ms > > not apply your patch, at git 729439607ad210dbb446e31754e8627d7e3f7dda > COPY data TO '/dev/null' WITH (FORMAT csv) \watch count=5 > Time: 644.246 ms > Time: 583.075 ms > Time: 568.670 ms > Time: 569.463 ms > Time: 569.201 ms > > I forgot to test other formats.
There can be some variance in the tests, so you'd better run much more tests so as you can get a better idea of the mean. Discarding the N highest and lowest values also reduces slightly the effects of the noise you would get across single runs. -- Michael
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