Bug #71468 [Com]: increased memory usage with mysqli in php 7

Edit report at https://bugs.php.net/bug.php?id=71468&edit=1 ID: 71468 Comment by: ryan dot brothers at gmail dot com Reported by: ryan dot brothers at gmail dot com Summary: increased memory usage with mysqli in php 7 Status: Open Type: Bug Package: MySQLi related Operating System: Linux PHP Version: 7.0.2 Block user comment: N Private report: N New Comment: Yes, mysqlnd is used in both. PHP was compiled with --with-mysqli. Previous Comments: ------------------------------------------------------------------------ [2016-01-28 03:02:25] laruence@php.net do they all used mysqlnd? ------------------------------------------------------------------------ [2016-01-27 23:57:23] ryan dot brothers at gmail dot com Description: ------------ I am seeing an issue in PHP 7 where large database queries are taking up more memory compared to PHP 5.6. In the below example, PHP 7 uses 8.3MB while PHP 5.6 only uses 1.8MB. I have placed SQL to create a test table of 100,000 rows at https://drive.google.com/uc?export=download&id=0B37DKbJklxg_Y3NadnRjc2tVbE0. Is this expected behavior or an issue with PHP 7 memory usage? Thanks for your help. Test script: --------------- <?php $mysqli = new mysqli('localhost', 'test', 'test', 'test'); $mysqli->real_query("SELECT * FROM a"); $result = $mysqli->store_result(); echo memory_get_usage()."\n"; exit; Expected result: ---------------- PHP 5.6.17: 1832472 PHP 7.0.2: 1832472 (or close to it) Actual result: -------------- PHP 5.6.17: 1832472 PHP 7.0.2: 8356704 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=71468&edit=1