Bug #55033 [NEW]: Memory Leak in magic method __get() [Zend Memory Manager]

From: Operating system: Mac OS X 10.6.7 PHP version: 5.3.6 Package: Performance problem Bug Type: Bug Bug description:Memory Leak in magic method __get() [Zend Memory Manager] Description: ------------ For some reason values returned by __get() aren't released from memory. $ php memory.php # (without --debug) 0.0096 seconds and 1.3461 MB for 10000 accessing known property $ php memory.php # (with --debug) 0.0317 seconds and 2.6435 MB for 10000 accessing known property $ export USE_ZEND_ALLOC=0 $ php memory.php # (with --debug) 0.0267 seconds and 0.0000 MB for 10000 accessing known property since disabling Zend Memory Manager solved the issue, the valgrind log is pretty much useless, thus not attached. Test script: --------------- <?php class Memleak { public function __get($name) { return "hello world"; } } $iterations = 10000; $foo = new Memleak(); $start = microtime(true); $mem = memory_get_usage(); for ($i=0; $i < $iterations; $i++) { $foo->{'bar' . $i}; } $_mem = memory_get_usage(); $_start = microtime(true); printf("%0.4f seconds and %0.4f MB for %d accessing known property\n", $_start - $start, ($_mem - $mem) / 1024 / 1024, $iterations); ?> Expected result: ---------------- 0.0099 seconds and 0.0000 MB for 10000 accessing known property Actual result: -------------- 0.0099 seconds and 1.3460 MB for 10000 accessing known property -- Edit bug report at http://bugs.php.net/bug.php?id=55033&edit=1 -- Try a snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=55033&r=trysnapshot52 Try a snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=55033&r=trysnapshot53 Try a snapshot (trunk): http://bugs.php.net/fix.php?id=55033&r=trysnapshottrunk Fixed in SVN: http://bugs.php.net/fix.php?id=55033&r=fixed Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=55033&r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=55033&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=55033&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=55033&r=needscript Try newer version: http://bugs.php.net/fix.php?id=55033&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=55033&r=support Expected behavior: http://bugs.php.net/fix.php?id=55033&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=55033&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=55033&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=55033&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=55033&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=55033&r=dst IIS Stability: http://bugs.php.net/fix.php?id=55033&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=55033&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=55033&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=55033&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=55033&r=mysqlcfg