On Tue, Jun 25, 2019 at 11:03 AM James Coleman <jtc...@gmail.com> wrote: > No, I haven't confirmed that it's called less frequently, and I'd be > extremely surprised if it were given the diff doesn't suggest any > changes to that at all.
I must have misunderstood, then. I thought that you were suggesting that that might have happened. > If you think it's important enough to do so, I can instrument it to > confirm, but I was mostly wanting to know if there were any other > plausible explanations, and I think you've provided one: there *are* > changes in the patch to memory contexts in tuplesort.c, so if memory > fragmentation is a real concern this patch could definitely notice > changes in that regard. Sounds like it's probably fragmentation. That's generally hard to measure. -- Peter Geoghegan
