Hi Noah, On Wed, May 1, 2024 at 5:24 AM Noah Misch <n...@leadboat.com> wrote: > On Thu, Apr 25, 2024 at 04:59:54PM +0400, Pavel Borisov wrote: > > 0001: Optimize speed by avoiding heap visibility checking for different > > non-deduplicated index tuples as proposed by Noah Misch > > > > Speed measurements on my laptop using the exact method recommended by Noah > > upthread: > > Current master branch: checkunique off: 144s, checkunique on: 419s > > With patch 0001: checkunique off: 141s, checkunique on: 171s > > Where is the CPU time going to make it still be 21% slower w/ checkunique on? > It's a great improvement vs. current master, but I don't have an obvious > explanation for the remaining +21%.
I think there is at least extra index tuples comparison. ------ Regards, Alexander Korotkov