From: Sarah Hoffmann <lonvia@denofr.de>
Date: Wed, 22 Dec 2021 07:59:31 +0000 (+0100)
Subject: disable JIT and parallel workers on search frontend
X-Git-Tag: v4.1.0~103^2
X-Git-Url: https://git.openstreetmap.org./nominatim.git/commitdiff_plain/042df4198a11da8456a3c192d3fe3f4726041612

disable JIT and parallel workers on search frontend

Bad query planning now also interferes with queries for search and
reverse.
---

diff --git a/lib-php/DB.php b/lib-php/DB.php
index 03ee6f1b..8e307b19 100644
--- a/lib-php/DB.php
+++ b/lib-php/DB.php
@@ -38,6 +38,9 @@ class DB
 
         $conn->exec("SET DateStyle TO 'sql,european'");
         $conn->exec("SET client_encoding TO 'utf-8'");
+        // Disable JIT and parallel workers. They interfere badly with search SQL.
+        $conn->exec("UPDATE pg_settings SET setting = -1 WHERE name = 'jit_above_cost'");
+        $conn->exec("UPDATE pg_settings SET setting = 0 WHERE name = 'max_parallel_workers_per_gather'");
         $iMaxExecution = ini_get('max_execution_time');
         if ($iMaxExecution > 0) {
             $conn->setAttribute(\PDO::ATTR_TIMEOUT, $iMaxExecution); // seconds