Horton

Re: is JIT available

David Rowley <dgrowleyml@gmail.com>

View thread View on postgr.es
From: David Rowley <dgrowleyml@gmail.com>
To: Scott Ribe <scott_ribe@elevated-dev.com>
Cc: Christoph Moench-Tegeder <cmt@burggraben.net>, PostgreSQL General <pgsql-general@lists.postgresql.org>
Date: 2020-07-29T01:19:55Z
Lists: pgsql-general 
On Wed, 29 Jul 2020 at 00:26, Scott Ribe <scott_ribe@elevated-dev.com> wrote:
> But does compilation with JIT enable and LLVM dev tools mean that all the LLVM compilation/optimization is built into the PG binaries, or does it require LLVM presence on the machine where deployed? And if so, does the function take that into account as well?

It's not enough for just the build to have been built with jit
enabled. The jit extension must also be present on the machine. I
think the new wording in
https://www.postgresql.org/docs/devel/functions-info.html conveys
that:

"Returns true if a JIT compiler extension is available (see Chapter
31) and the jit configuration parameter is set to on."

David

Commits

  1. Doc: Improve documentation for pg_jit_available()