<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>32.3. Configuration</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="jit-decision.html" title="32.2. When to JIT?" /><link rel="next" href="jit-extensibility.html" title="32.4. Extensibility" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">32.3. Configuration</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="jit-decision.html" title="32.2. When to JIT?">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="jit.html" title="Chapter 32. Just-in-Time Compilation (JIT)">Up</a></td><th width="60%" align="center">Chapter 32. Just-in-Time Compilation (<acronym xmlns="http://www.w3.org/1999/xhtml" class="acronym">JIT</acronym>)</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 11.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="jit-extensibility.html" title="32.4. Extensibility">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="JIT-CONFIGURATION"><div class="titlepage"><div><div><h2 class="title" style="clear: both">32.3. Configuration</h2></div></div></div><p> The configuration variable <a class="xref" href="runtime-config-query.html#GUC-JIT">jit</a> determines whether <acronym class="acronym">JIT</acronym> compilation is enabled or disabled. If it is enabled, the configuration variables <a class="xref" href="runtime-config-query.html#GUC-JIT-ABOVE-COST">jit_above_cost</a>, <a class="xref" href="runtime-config-query.html#GUC-JIT-INLINE-ABOVE-COST">jit_inline_above_cost</a>, and <a class="xref" href="runtime-config-query.html#GUC-JIT-OPTIMIZE-ABOVE-COST">jit_optimize_above_cost</a> determine whether <acronym class="acronym">JIT</acronym> compilation is performed for a query, and how much effort is spent doing so. </p><p> <a class="xref" href="runtime-config-client.html#GUC-JIT-PROVIDER">jit_provider</a> determines which <acronym class="acronym">JIT</acronym> implementation is used. It is rarely required to be changed. See <a class="xref" href="jit-extensibility.html#JIT-PLUGGABLE" title="32.4.2. Pluggable JIT Providers">Section 32.4.2</a>. </p><p> For development and debugging purposes a few additional configuration parameters exist, as described in <a class="xref" href="runtime-config-developer.html" title="19.17. Developer Options">Section 19.17</a>. </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="jit-decision.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="jit.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="jit-extensibility.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">32.2. When to <acronym class="acronym">JIT</acronym>? </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 32.4. Extensibility</td></tr></table></div></body></html>
