Bug #53669 [NEW]: PHP does not return memory to system

From: Operating system: Linux 2.6.29.2-smp PHP version: 5.3.4 Package: Scripting Engine problem Bug Type: Bug Bug description:PHP does not return memory to system Description: ------------ The script shows a huge difference in memory used by PHP and memory claimed by the process. The memory is only returned to the system by exiting the process. A simple function that would return the unused memory to the kernel would be a great solution. Disabling gc will only make it worse. Test script: --------------- <?php gc_enable(); for($i = 0; 1000000 > $i; $i++) { $x = new stdClass(); $x->y = new stdClass(); $x->y->x = $x; $x->meuk = str_repeat('x', 10000); } gc_collect_cycles(); var_dump(memory_get_usage(false)); var_dump(memory_get_usage(true)); ?> Expected result: ---------------- The usage numbers lying closer to eachother. Actual result: -------------- int(1816820) int(25427968) -- Edit bug report at http://bugs.php.net/bug.php?id=53669&edit=1 -- Try a snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=53669&r=trysnapshot52 Try a snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=53669&r=trysnapshot53 Try a snapshot (trunk): http://bugs.php.net/fix.php?id=53669&r=trysnapshottrunk Fixed in SVN: http://bugs.php.net/fix.php?id=53669&r=fixed Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=53669&r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=53669&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=53669&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=53669&r=needscript Try newer version: http://bugs.php.net/fix.php?id=53669&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=53669&r=support Expected behavior: http://bugs.php.net/fix.php?id=53669&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=53669&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=53669&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=53669&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=53669&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=53669&r=dst IIS Stability: http://bugs.php.net/fix.php?id=53669&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=53669&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=53669&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=53669&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=53669&r=mysqlcfg