All Your GUCs in a Row: jit and jit_provider

An in-depth look at PostgreSQL's jit and jit_provider settings explains how JIT compilation trades upfront compile time for faster execution on expensive analytical queries. It highlights a silent failure mode: if the llvmjit shared library isn't installed (common on Debian/Ubuntu packages built with --no-install-recommends, and deliberately excluded on RPM builds), jit=on has no effect, produces no error or warning, and queries simply run without JIT. The only reliable check is running pg_jit_available() with jit turned on, since the config setting alone doesn't guarantee the library actually loaded.

Source: https://postgr.es/p/9sk. 8 Sync News only summarizes and links out; content copyright belongs to the authors and original sources.