#34779 [NEW]: Default value of "output_buffering" (4096) causes memory overflow on Windows XP

From: jan dot lachman at stringdata dot cz Operating system: WindowsXP PHP version: 5.1.0RC1 PHP Bug Type: Performance problem Bug description: Default value of "output_buffering" (4096) causes memory overflow on Windows XP 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. -- Edit bug report at http://bugs.php.net/?id=34779&edit=1 -- Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=34779&r=trysnapshot4 Try a CVS snapshot (php5.0): http://bugs.php.net/fix.php?id=34779&r=trysnapshot50 Try a CVS snapshot (php5.1): http://bugs.php.net/fix.php?id=34779&r=trysnapshot51 Fixed in CVS: http://bugs.php.net/fix.php?id=34779&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=34779&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=34779&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=34779&r=needscript Try newer version: http://bugs.php.net/fix.php?id=34779&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=34779&r=support Expected behavior: http://bugs.php.net/fix.php?id=34779&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=34779&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=34779&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=34779&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=34779&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=34779&r=dst IIS Stability: http://bugs.php.net/fix.php?id=34779&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=34779&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=34779&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=34779&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=34779&r=mysqlcfg