On 2/20/24 06:38, David Rowley wrote: > On Tue, 20 Feb 2024 at 18:31, Tom Lane <t...@sss.pgh.pa.us> wrote: >> FWIW, I seriously doubt that an extra walk of the plan tree is even >> measurable compared to the number of cycles JIT compilation will >> expend if it's called. So I don't buy your argument here. >> We would be better off to do this in a way that's clean and doesn't >> add overhead for non-JIT-enabled builds. > > The extra walk of the tree would need to be done for every plan, not > just the ones where we do JIT. I'd rather find a way to not add this > extra plan tree walk, especially since the vast majority of cases on > an average instance won't be doing any JIT. >
I believe Tom was talking about non-JIT-enabled-builds, i.e. builds that either don't support JIT at all, or where jit=off. Those would certainly not need the extra walk. regards -- Tomas Vondra EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company
