PHP: memory_get_usage

Description

int memory_get_usage ( void )

Returns the amount of memory, in bytes, that's currently being allocated to your PHP script.

memory_get_usage() will only be defined if your PHP is compiled with the --enable-memory-limit configuration option.

Example 1. A memory_get_usage() example

<?php // This is only an example, the numbers below will // differ depending on your system echo memory_get_usage() . "\n"; // 36640 $a = str_repeat("Hello", 4242); echo memory_get_usage() . "\n"; // 57960 unset($a); echo memory_get_usage() . "\n"; // 36744 ?>

See also memory_limit.

User Contributed Notes
memory_get_usage

markus at computino dot de
09-Jan-2005 04:38


on PHP Version 5.0.2 (with WinXP pro, Apache 2) it's not 

<?php $_SERVER["OS"] ?> but 

<?php $_ENV["OS"] ?>

webNOSPAMsjwans at hotmail dot com
01-Dec-2004 09:09


A quick and dirty Windows XP / 2003 wordaround:



<?php 



function getMemUsage()

{

        

        if (function_exists('memory_get_usage'))

        {

            return memory_get_usage();

        }

        else if ( strpos( strtolower($_SERVER["OS"]), 'windows') !== false)

        {

            // Windows workaround

            $output = array();

            

            exec('tasklist /FI "PID eq ' . getmypid() . '" /FO LIST', $output);            

            return substr($output[5], strpos($output[5], ':') + 1);

        }

        else

        {

            return '<b style="color: red;">no value</b>';

        }

}



?>

randolphothegreat at yahoo dot com
29-Nov-2004 03:37


I'd just like to point out that although sandeepc at myrealbox dot com's idea for displaying the current memory usage is a good one, it's perhaps a bad idea to pipe the entire process list through grep. A better performing method would be to select only the process we're interested in:



<?

$pid = getmypid();

error_log('MEMORY USAGE (% KB PID ): ' . `ps --pid $pid --no-headers -o%mem,rss,pid`);

?>



True, it's not much of a performance boost, but every bit helps.

24-Oct-2004 06:59


Unfortunately, this function is not available under Windows

ad-rotator.com
14-May-2004 12:31


The method sandeepc at myrealbox dot com posted yields larger memory usage, my guess is that it includes all the PHP interpreter/internal code and not just the script being run.



1) Use ps command

MEMORY USAGE (% KB PID ):  0.8 12588 25087 -> about 12MB

2) Use memory_get_usage() 

int(6041952) -> about 6MB

sandeepc at myrealbox dot com
11-Nov-2003 11:15


To get this in pre 4.2.3 do a (works on unix like systems only):



$my_pid = getmypid();

error_log("MEMORY USAGE (% KB PID ): ".`ps -eo%mem,rss,pid | grep $my_pid`);



found this tip somewhere in bugs.php.net!