#46790 [Opn->Fbk]: Memory leak with classes
| From: | lstrojny@php.net | Date: | Sun, 07 Dec 2008 07:13:01 +0000 |
| Subject: | #46790 [Opn->Fbk]: Memory leak with classes | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-131706@lists.php.net to get a copy of this message | ||
ID: 46790
Updated by: lstrojny@php.net
Reported By: o_O_Tync at mail dot ru
-Status: Open
+Status: Feedback
Bug Type: Class/Object related
Operating System: Win, FreeBSD
PHP Version: 5.2.7
New Comment:
Please try using this CVS snapshot:
http://snaps.php.net/php5.3-latest.tar.gz
For Windows:
http://windows.php.net/snapshots/
Previous Comments:
------------------------------------------------------------------------
[2008-12-07 06:34:02] o_O_Tync at mail dot ru
Description:
------------
I've come across a memory leak: garbage collector failes to free memory
occupied by linked objects, such as:
$obj1->pair = $obj2; $obj2->pair = $obj1;
Below goes the problematic piece of code: over many iterations - it
occupies a lot of memory.
If we comment 'line1' or 'line2' or both - memory is okay (48 Kb), but
cross-linking reveals a bug (839 Kb) despite of explicit unsetting.
The commented 'this helps' line solves the problem.
Tested under WinXP, and FreeBSD 6.1 using the latest PHP 5.2.7
Reproduce code:
---------------
<?php
class Paired
{
/** Paired object
* @var Paired
*/
public $pair;
}
for ($i=0;$i<2000;$i++)
{
$obj1 = new Paired; $obj2 = new Paired;
$obj1->pair = $obj2; // 'line1'
$obj2->pair = $obj1; // 'line2'
// $obj1->pair = null; $obj2->pair = null; // this helps
unset($obj1); unset($obj2); // Explicitly
}
print 'Mem: '.floor(memory_get_usage()/1024).' Kb';
?>
Expected result:
----------------
Mem: 48 Kb
Actual result:
--------------
Mem: 839 Kb
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=46790&edit=1