#34779 [Opn->Bgs]: Default value of "output_buffering" (4096) causes memory overflow on Windows XP
ID: 34779
Updated by: sniper@php.net
Reported By: jan dot lachman at stringdata dot cz
-Status: Open
+Status: Bogus
Bug Type: Output Control
Operating System: WindowsXP
PHP Version: 5CVS-2005-10-07
New Comment:
This is impossible. If you set output_buffering to 'On' it's exactly
same as setting it to 4096. So you're really doing something else or
not telling us everything.
Previous Comments:
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[2005-10-24 09:34:26] jan dot lachman at stringdata dot cz
Ok. I use "standard" ab.exe(Win) or OpenSTA(Win) or Siege(from linux),
etc on "client" side. On server side I have small script (like
index.php) that includes:
<?
phpinfo();
sleep 5;
?>
nothing else. How it works you know. I know that if my php use
output_buffering = 4096 - our server goes down, but when I use
output_buffering = On, it works perfectly!
------------------------------------------------------------------------
[2005-10-24 00:28:55] edink@php.net
I have just tried 10000 connections to phpinfo() page an memory usage
has stablized at around 21 MB for 10 concurrent connections.
Please post a complite test script that would allow us to trace the
problem.
------------------------------------------------------------------------
[2005-10-07 16:57:08] jan dot lachman at stringdata dot cz
Nothing. I mean without change. With default value (output_buffering =
4096) bad, with output_buffering = On working perfectly. On request I
may send screenshot of Task Manager (with-and-without directive).
Thanks.
------------------------------------------------------------------------
[2005-10-07 15:39:08] sniper@php.net
Please try using this CVS snapshot:
http://snaps.php.net/php5-latest.tar.gz
For Windows:
http://snaps.php.net/win32/php5-win32-latest.zip
------------------------------------------------------------------------
[2005-10-07 14:53:26] jan dot lachman at stringdata dot cz
Description:
------------
On MS Windows XP Pro (SP2) and Apache 2.0.5.4 has PHP(php5apache2.dll
module) a serious problem with value output_buffering = 4096. When I
start the web-server, then I run benchmarking programs (like siege or
ab.exe or OpenSTA) and I try to access a small script that includes
phpinfo (with 50-100 simulated user connections), I get memory load
about 10MB within !one! minute (and growing) - until the RAM (715MB) is
available. Then total crash follows after this.
After two-days testing, we found (with my team-mate) little way to
solve this problem. If we set output_buffering = On , it's working
perfectly.
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Thread (6 messages)