Questions tagged [jit]

Just-In-Time (JIT) compilation is a way of executing computer code that involves compilation during execution of a program – at run time – rather than prior to execution. Used in some database systems to accelerate performance.

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Postgres 13/14 JIT execution increase execution time of query considerably

I have a complex DB query that I run on different systems with identical specs, but different OS (CentOS7 vs. Debian 11). The Postgres version is 13.7, but I also tried with 14.4. I get vastly ...
spa's user avatar
  • 193
2 votes
0 answers

pg_jit_available showing 'false' and jit not working, but config file seems set up properly

I am trying to turn on JIT for testing purposes on a Postgresql 12 server, it was off before. My postgresql.conf has the following properties activated (basically all default values): jit = on ...
bakamitai666's user avatar
10 votes
1 answer

Handling performance problems with jit in postgres 12

tl;dr: What is the best way to handle performance decrease caused by jit? Background: Lately I have migrated from postgres 11 to 12 and noticed, that some queries / procedures run considerably ...
Andronicus's user avatar
2 votes
2 answers

Queries on large database kill connection to the server, works with LIMIT

I'm trying to run queries on a large-ish database without killing the connection to the server. I'm using Postgres 12.1 on a mac with 16gb of memory, and about 40gb of free disk. The database is ...
doeeehunt's user avatar
7 votes
1 answer

How to tell if Postgres was built with the option to include LLVM technology for JIT?

Postgres 11 gained the ability to perform Just-in-Time Compilation (JIT) based on LLVM technology. The manual notes that this feature depends on Postgres having been built with the --with-llvm ...
Basil Bourque's user avatar