Req #33487 [Com]: Memory allocated for objects created in object methods is not released

Edit report at https://bugs.php.net/bug.php?id=33487&edit=1 ID: 33487 Comment by: nikic@php.net Reported by: robert dot munteanu at betbrain dot com Summary: Memory allocated for objects created in object methods is not released Status: Assigned Type: Feature/Change Request Package: Scripting Engine problem Operating System: * PHP Version: * Assigned To: dmitry Block user comment: N Private report: N New Comment: In PHP 7 the object store is just a ptr array, so the overhead here reduces to sizeof(void *) * max_number_of_objects. This should reduce the memory usage of the object store by a factor of 8 on both 32bit and 64bit. Previous Comments: ------------------------------------------------------------------------ [2014-08-27 06:16:48] dmitry@php.net This is not a bug, and it's not fixed. ------------------------------------------------------------------------ [2014-08-26 18:55:41] chrisdmiddleton at gmail dot com Has this bug been fixed in PHP 5.*? ------------------------------------------------------------------------ [2006-01-26 19:56:32] nick at mythgaming dot net Note that the memory is freed inside php, just not yielded back to the operating system until execution ends. In this example, the memory is claimed as the function executes, then re-used when the function is run again (instead of using up twice as much memory): ---------- <?php function doNothing() { $res = array(); for ( $i = 0; $i < 20000; $i++) { $res[$i] = new StdClass; } } // Unix only function get_usage() { $my_pid = getmypid(); $usage = ps -eo%mem,rss,pid | grep $my_pid; $kb = preg_split("/\s+/", $usage); return sprintf("%.3f",$kb[2] / 1024) . "MB"; } echo "Before: ".get_usage()."\n"; doNothing(); echo "One Use: ".get_usage()."\n"; doNothing(); echo "Two Uses: ".get_usage()."\n"; ?> Output ------ Before: 5.555MB One Use: 10.164MB Two Uses: 10.293MB ------------------------------------------------------------------------ [2005-06-27 15:29:38] dmitry@php.net This is not really a bug, but unefficient usage of memory by zend_object_storage. It frees object buckets only on request shutdown. The test case allocates: 16384 * sizeof(zend_object_store_bucket) = 393216 bytes ------------------------------------------------------------------------ [2005-06-27 12:17:20] sniper@php.net Dmitry, is there any way to fix this..? (btw. unset() does NOT free all the memory..but that's, AFAIK, by design) ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at https://bugs.php.net/bug.php?id=33487 -- Edit this bug report at https://bugs.php.net/bug.php?id=33487&edit=1