Bug #53415 [NEW]: memory_get_usage is inaccurate

From: Date: Fri, 26 Nov 2010 13:36:49 +0000
Subject: Bug #53415 [NEW]: memory_get_usage is inaccurate
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-156488@lists.php.net to get a copy of this message 
From:             
Operating system: Linux durango 2.6.36-020636rc8-g
PHP version:      5.3.3
Package:          Scripting Engine problem
Bug Type:         Bug
Bug description:memory_get_usage is inaccurate

Description:
------------
memory_get_usage does not work correctly with reflection calls such as
invoke.

Test script:
---------------
<?php
 
class HelloWorld
{
 public function sayHelloTo($name)
 {
  $s = memory_get_usage();
 
  $something = str_repeat($name, pow(1024, 2));
 
  echo 'Inside: ';
  echo memory_get_usage() - $s.PHP_EOL;
 }
}
 
$reflectionMethod = new ReflectionMethod('HelloWorld', 'sayHelloTo');
 
$s = memory_get_usage();
 
 $reflectionMethod->invoke(new HelloWorld(), 'a');
 
echo 'Outside: ';
echo memory_get_usage() - $s;

Expected result:
----------------
Inside: 1048760
Outside: 1048760

Actual result:
--------------
Inside: 1048760
Outside: 92

-- 
Edit bug report at http://bugs.php.net/bug.php?id=53415&edit=1
-- 
Try a snapshot (PHP 5.2):            http://bugs.php.net/fix.php?id=53415&r=trysnapshot52
Try a snapshot (PHP 5.3):            http://bugs.php.net/fix.php?id=53415&r=trysnapshot53
Try a snapshot (trunk):              http://bugs.php.net/fix.php?id=53415&r=trysnapshottrunk
Fixed in SVN:                        http://bugs.php.net/fix.php?id=53415&r=fixed
Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=53415&r=needdocs
Fixed in release:                    http://bugs.php.net/fix.php?id=53415&r=alreadyfixed
Need backtrace:                      http://bugs.php.net/fix.php?id=53415&r=needtrace
Need Reproduce Script:               http://bugs.php.net/fix.php?id=53415&r=needscript
Try newer version:                   http://bugs.php.net/fix.php?id=53415&r=oldversion
Not developer issue:                 http://bugs.php.net/fix.php?id=53415&r=support
Expected behavior:                   http://bugs.php.net/fix.php?id=53415&r=notwrong
Not enough info:                     http://bugs.php.net/fix.php?id=53415&r=notenoughinfo
Submitted twice:                     http://bugs.php.net/fix.php?id=53415&r=submittedtwice
register_globals:                    http://bugs.php.net/fix.php?id=53415&r=globals
PHP 4 support discontinued:          http://bugs.php.net/fix.php?id=53415&r=php4
Daylight Savings:                    http://bugs.php.net/fix.php?id=53415&r=dst
IIS Stability:                       http://bugs.php.net/fix.php?id=53415&r=isapi
Install GNU Sed:                     http://bugs.php.net/fix.php?id=53415&r=gnused
Floating point limitations:          http://bugs.php.net/fix.php?id=53415&r=float
No Zend Extensions:                  http://bugs.php.net/fix.php?id=53415&r=nozend
MySQL Configuration Error:           http://bugs.php.net/fix.php?id=53415&r=mysqlcfg

Thread (2 messages)

« previous php.bugs (#156488) next »