Bug #51648 [Opn]: Memory leak in infinite loop
Edit report at http://bugs.php.net/bug.php?id=51648&edit=1
ID: 51648
Updated by: felipe@php.net
Reported by: shooreek at gmail dot com
Summary: Memory leak in infinite loop
Status: Open
Type: Bug
Package: Scripting Engine problem
Operating System: WinXP SP3
PHP Version: 5.3.2
New Comment:
I can't reproduce it on Linux.
Previous Comments:
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[2010-04-23 16:01:33] shooreek at gmail dot com
Description:
------------
Run PHP script with infinite loop from command line. Call each loop
database function from extension (I tested SQLite and Mysqli). Open task
manager. You will see that memory use is growing up, while PHP function
memory_get_usege() reports that memory usage is constant. The memory
usage may grow up to 1,5Gb or even more (depends on script code size),
even if memory_limit is set to 8Mb.
How is this possible?!
Test script:
---------------
<?php
$dbfile = 'mysqlitedb.db';
if(file_exists($dbfile)) unlink($dbfile);
$db = new SQLite3($dbfile);
$db->exec('CREATE TABLE foo (id INTEGER, bar varchar(30))');
$db->exec("INSERT INTO foo (id, bar) VALUES (1, 'This is a test')");
$i=0;
while(1)
{
$i++;
$db->exec("INSERT INTO foo (id, bar) VALUES ($i, 'This is a test')");
$db->exec("UPDATE foo SET bar='This is memory leak' WHERE id=$i");
echo "$i ".memory_get_usage()." ".memory_get_usage(true)."\r";
}
?>
Expected result:
----------------
Constant memory usage.
Actual result:
--------------
Memory usage grown up (script output):
iteration, memory_get_usage(), memory_get_usage(true), memory usage(from
taskmgr), virtual memory usage(from taskmgr)
2131 330384 524288 - 1068Kb 5356Kb
4661 330384 524288 - 1148Kb 5440Kb
10974 330384 524288 - 1336Kb 5652Kb
24985 330384 524288 - 1824Kb 6140Kb
43894 330384 524288 - 2516Kb 6828Kb
As you can see, memory usage is not constant. Why?!
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