Re: Query performance in 9.6.24 vs 14.10

According to my tests, sometimes JIT is a little faster, and sometimes it's a little slower. Mostly within the realm of statistical noise (especially with each query having a sample size of only 13, on a VM that lives on a probably-busy host).

On Mon, Jan 29, 2024 at 9:18 AM Ron Johnson <ronljohnsonjr@gmail.com> wrote:

Yes, jit=on.

I'll test them with jit=off, to see the difference.  (The application is 3rd party, so will change it at the system level.)

On Mon, Jan 29, 2024 at 7:09 AM Bob Jolliffe <bobjolliffe@gmail.com> wrote:

Out of curiosity, is the pg14 running with the default jit=on setting?  

This is obviously entirely due to the nature of the particular queries themselves, but we found that for our workloads that pg versions greater than 11 were exacting a huge cost due to the jit compiler.  Once we explicitly turned jit=off we started to see improvements.