Bug #55033 [Com]: Memory Leak in magic method __get() [Zend Memory Manager]
| From: | rodney dot rehm at medialize dot de | Date: | Sat, 11 Jun 2011 15:01:14 +0000 |
| Subject: | Bug #55033 [Com]: Memory Leak in magic method __get() [Zend Memory Manager] | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-161311@lists.php.net to get a copy of this message | ||
Edit report at http://bugs.php.net/bug.php?id=55033&edit=1
ID: 55033
Comment by: rodney dot rehm at medialize dot de
Reported by: rodney dot rehm at medialize dot de
Summary: Memory Leak in magic method __get() [Zend Memory
Manager]
Status: Bogus
Type: Bug
Package: Performance problem
Operating System: Mac OS X 10.6.7
PHP Version: 5.3.6
Block user comment: N
Private report: N
New Comment:
What exactly do you mean by "separating return from __get()"? The memory is pumped
regardless of how I return (value, reference). How am I supposed to "separate" here?
Previous Comments:
------------------------------------------------------------------------
[2011-06-11 16:48:14] felipe@php.net
There is no memleak, what happens is that the return from __get() needs to be separated.
See bug #48197
------------------------------------------------------------------------
[2011-06-11 14:40:52] rodney dot rehm at medialize dot de
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
------------------------------------------------------------------------
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Edit this bug report at http://bugs.php.net/bug.php?id=55033&edit=1