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<!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 id="docContent" class="container-fluid col-10"><div 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 class="acronym">JIT</acronym>)</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.4 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 /></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="20.17. Developer Options">Section 20.17</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" title="32.2. When to JIT?">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="jit.html" title="Chapter 32. Just-in-Time Compilation (JIT)">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="jit-extensibility.html" title="32.4. Extensibility">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" title="PostgreSQL 15.4 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 32.4. Extensibility</td></tr></table></div></body></html>
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