On Friday, January 16, 2026 10:29:59 AM Central European Standard Time Michael
Banck wrote:

Hi,

On Thu, Jan 15, 2026 at 12:26:23PM +0100, Álvaro Herrera wrote:

On 2026-Jan-15, Andreas Karlsson wrote:

Great find! Sadly shows how little people actually use JIT.

I disagree. Given that JIT is enabled by default, I think lots of
people use it.

Well, not sure about that - all of the three major hyperscalers disable
JIT in their managed Postgres offerings (or at least used to when I last
checked), and those are a major chunk of usage these days. Also, both
the RPM and (since recently) the Debian/Ubuntu community packages have
factored out the LLVM/jit part into their own packages and AFAIK they do
not get installed by default.

So while the GUC is on by default, a lot of users might not use JIT
these days and not know either way.

What they don't do, is realize that things are slower
than they could be -- much less try to figure out why.

Right.

People have also seen blog articles saying «JIT is bad, switch it off» that are
right if you are in the wrong use cases for JIT. Which, to be fair, is not
easy to figure out.