Disable JIT in Postgres settings

[relicode]

Use of PostgreSQL JIT is not recommended. It is enabled by default in PostgreSQL 12 and higher. JIT is benifitial for slow queries where executing the SQL takes substantial time and that time is not spent in function calls. This is not the case for rendering, where most time is spent either fetching from disk, in PostGIS functions, or the query is fast. In theory, the query planner will only use JIT on slower queries, but it is known to get the type of queries map rendering requires wrong.

More info

[docentYT]

You should use off, not false.

See boot_val and reset_val below.

# sudo -u postgres psql -d gis -c "select * from pg_settings where name like '%jit%';"
          name           | setting | unit |                        category                        |                         short_desc                          |          extra_desc          |      context      | vartype |       source       | min_val |   max_val    | enumvals | boot_val | reset_val |                      sourcefile                       | sourceline | pending_restart 
-------------------------+---------+------+--------------------------------------------------------+-------------------------------------------------------------+------------------------------+-------------------+---------+--------------------+---------+--------------+----------+----------+-----------+-------------------------------------------------------+------------+-----------------
 jit                     | off     |      | Query Tuning / Other Planner Options                   | Allow JIT compilation.                                      |                              | user              | bool    | configuration file |         |              |          | on       | off       | /etc/postgresql/15/main/conf.d/postgresql.custom.conf |         27 | f