memory_get_peak_usage
A note to the previous post, it depends on how you've setup PHP. If you've set it up via CGI/FastCGI you will get the PHP process size.
If you are using a module, you will get the whole process that loads the module.
memory_get_usage
(PHP 4 >= 4.3.2, PHP 5)
memory_get_usage — PHP に割り当てられたメモリの量を返す
説明
int memory_get_usage
([ bool $real_usage
] )
現在の PHP スクリプトに割り当てられたメモリの量をバイト単位で返します。
パラメータ
- real_usage
-
これを TRUE に設定すると、システムが割り当てた実際のメモリの大きさを取得します。 省略したり FALSE を設定したりすると、 emalloc() が使用するメモリのみを報告します。
返り値
メモリの量をバイト単位で返します。
変更履歴
| バージョン | 説明 |
|---|---|
| 5.2.1 | この関数を使用するために、 --enable-memory-limit でコンパイルすることは必須ではなくなりました。 |
| 5.2.0 | real_usage が追加されました。 |
例
例1 memory_get_usage() の例
<?php
// これは単なる例にすぎません。
// 以下の数値はシステムによって変化します。
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
?>
add a note
User Contributed Notesmemory_get_usage
Cory
05-Mar-2008 09:07
05-Mar-2008 09:07
php_dev at dunnbypaul dot net
04-Jul-2007 07:25
04-Jul-2007 07:25
Regarding the function posted by
e dot a dot schultz at gmail dot com
I am running XAMPP on a windows box and the memory usage that the function is giving me is for the entire instance of apache.exe. Thats a lot more memory than my single PHP process. Maybe this works as expected on IIS, but not on apache! (I am getting a report of about 26MB on win vs. only 700k on Linux).
joe at schmoe dot com
23-Dec-2006 07:44
23-Dec-2006 07:44
the various memory_get_usage replacements here don't seem to work on Mac OS X 10.4(Intel)
I got it to work like this...
<?php
function memory_get_usage()
{
$pid = getmypid();
exec("ps -o rss -p $pid", $output);
return $output[1] *1024;
}
?>
e dot a dot schultz at gmail dot com
09-Apr-2006 09:41
09-Apr-2006 09:41
This is a function that should work for both Windows XP/2003 and most distrabutions of UNIX and Mac OS X.
<?php
if( !function_exists('memory_get_usage') )
{
function memory_get_usage()
{
//If its Windows
//Tested on Win XP Pro SP2. Should work on Win 2003 Server too
//Doesn't work for 2000
//If you need it to work for 2000 look at http://us2.php.net/manual/en/function.memory-get-usage.php#54642
if ( substr(PHP_OS,0,3) == 'WIN')
{
if ( substr( PHP_OS, 0, 3 ) == 'WIN' )
{
$output = array();
exec( 'tasklist /FI "PID eq ' . getmypid() . '" /FO LIST', $output );
return preg_replace( '/[\D]/', '', $output[5] ) * 1024;
}
}else
{
//We now assume the OS is UNIX
//Tested on Mac OS X 10.4.6 and Linux Red Hat Enterprise 4
//This should work on most UNIX systems
$pid = getmypid();
exec("ps -eo%mem,rss,pid | grep $pid", $output);
$output = explode(" ", $output[0]);
//rss is given in 1024 byte units
return $output[1] * 1024;
}
}
}
?>
xolox at home dot nl
03-Apr-2006 11:02
03-Apr-2006 11:02
<?php
// Original from http://php.net/memory_get_usage by websjwans at hotmail dot com. Thanks alot!
if ( ! function_exists( 'memory_get_usage' ) ):
// Only define function if it doesn't exist
function memory_get_usage()
{
// If we are running on Windows
if ( substr( PHP_OS, 0, 3 ) == 'WIN' ):
$output = array();
// Should check whether tasklist is available, but I'm lazy
exec( 'tasklist /FI "PID eq ' . getmypid() . '" /FO LIST', $output );
// Filter non-numeric characters from output. Why not use substr & strpos?
// I'm running Windows XP Pro Dutch, and it's output does not match the
// English variant, as will all other translations. This is a more generic
// approach, and has a better chance of actually working
return preg_replace( '/[^0-9]/', '', $output[5] ) * 1024;
// Tasklist outputs memory usage in kilobytes, memory_get_usage in bytes.
// So we multiply by 1024 and in the process convert from string to integer.
else:
return false;
endif;
}
endif;
?>
Works for me. Functionality should match memory_get_usage(), albeit slower (exec & regex). Have fun!
- Peter Odding
John Ring
22-Mar-2006 06:54
22-Mar-2006 06:54
Oops, that was a question.
I'll change it to a note simply:
Note: This is NOT enabled at all in the Win32 builds.
Best regards
grey - greywyvern - com
18-Aug-2005 05:37
18-Aug-2005 05:37
If nothing else in the user notes below works for you, you can get a very (VERY) rough estimate of PHP memory usage by outputting the $GLOBALS array, stripping it of indentation whitespace, and counting the characters in the resulting string. This method has a very high overhead (to be expected), but works on all operating systems, regardless of whether or not they have the --enable-memory-limit config option set. I find that the syntax overhead of the print_r() statement roughly accounts for the PHP runtime base memory usage.
The code below is set up to work on all arrays, not just the $GLOBALS array. Keep in mind that outside data referenced by resource IDs, such as database results and open file data, is not included in this total.
<?php
function array_size($arr) {
ob_start();
print_r($arr);
$mem = ob_get_contents();
ob_end_clean();
$mem = preg_replace("/\n +/", "", $mem);
$mem = strlen($mem);
return $mem;
}
$memEstimate = array_size($GLOBALS);
?>
Use only if being off to either side by at least 20% is acceptible for your purposes.
vesa dot kivisto at nepton dot fi
14-Jul-2005 11:02
14-Jul-2005 11:02
[EDIT by danbrown AT php DOT net: This function will only extend Windows versions of PHP where the server has the required third-party software.]
I was unable to get the previous examples working properly and created code which works at least for me. Enjoy!
<?php
// Please note that you'll need the pslist.exe utility from http://www.sysinternals.com/Utilities/PsTools.html
// This is because win/2000 itself does not provide a task list utility.
//
function getMemoryUsage() {
// try to use PHP build in function
if( function_exists('memory_get_usage') ) {
return memory_get_usage();
}
// Try to get Windows memory usage via pslist command
if ( substr(PHP_OS,0,3) == 'WIN') {
$resultRow = 8;
$resultRowItemStartPosition = 34;
$resultRowItemLength = 8;
$output = array();
exec('pslist -m ' . getmypid() , $output);
return trim(substr($output[$resultRow], $resultRowItemStartPosition, $resultRowItemLength)) . ' KB';
}
// No memory functionality available at all
return '<b style="color: red;">no value</b>';
}
?>
guenter_doege at web dot de
11-Jul-2005 04:28
11-Jul-2005 04:28
The Win XP / 2003 workaround script will also work with windows 2000 with a few slight modifications.
Please note that you'll need the pslist.exe utility from http://www.sysinternals.com/Utilities/PsTools.html because win/2000 itself does not provide a task list utility.
<?php
function getMemUsage()
{
if (function_exists('memory_get_usage'))
{
return memory_get_usage();
}
else if ( substr(PHP_OS,0,3) == 'WIN')
{
// Windows 2000 workaround
$output = array();
exec('pslist ' . getmypid() , $output);
return trim(substr($output[8],38,10));
}
else
{
return '<b style="color: red;">no value</b>';
}
}
?>
MagicalTux at FF dot st
25-May-2005 05:08
25-May-2005 05:08
When you need to get the OS, do not use $_SERVER['OS'] or $_ENV['OS'], better use PHP_OS constant !
<?php
if (substr(PHP_OS,0,3)=='WIN') {
// [...]
}
?>
You also have other values such as CYGWIN_NT-5.0, Linux, ... this is the best way to get system's os (anyone on linux can do an "export OS=windows")
webNOSPAMsjwans at hotmail dot com
02-Dec-2004 02:09
02-Dec-2004 02:09
A quick and dirty Windows XP / 2003 wordaround:
<?php
function getMemUsage()
{
if (function_exists('memory_get_usage'))
{
return memory_get_usage();
}
else if ( strpos( strtolower($_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
30-Nov-2004 08:37
30-Nov-2004 08:37
[EDIT by danbrown AT php DOT net: This is intended by the author to only be used with PHP 4 < 4.3.2.]
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:
<?php
$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.
ad-rotator.com
15-May-2004 03:31
15-May-2004 03:31
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
12-Nov-2003 04:15
12-Nov-2003 04:15
To get this in pre-4.3.2 do (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!