sleep
To get just current load avg, you can do :
<?php
$output = shell_exec('cat /proc/loadavg');
$loadavg = substr($output,0,strpos($output," "));
?>
sys_getloadavg
(PHP 5 >= 5.1.3)
sys_getloadavg — Ortalama sistem yükünü döndürür
Açıklama
array sys_getloadavg
( void
)
Son 1., 5. ve 15. dakikada ölçülen ortalama sistem yükünü (sistemde çalışmakta olan süreç sayısını) gösteren üç değer döndürür.
Dönen Değerler
Son 1., 5. ve 15. dakikada alınan örnekleri içeren bir dizi döndürür.
Örnekler
Örnek 1 - sys_getloadavg() örneği
<?php
$load = sys_getloadavg();
if ($load[0] > 80) {
header('HTTP/1.1 503 Too busy, try again later');
die('Sunucu çok meşgul. Lütfen daha sonra tekrar deneyin.');
}
?>
Notlar
Bilginize: Bu işlev Windows sistemlerinde çalışmaz.
add a note
User Contributed Notessys_getloadavg
Anonymous
19-Nov-2009 08:14
19-Nov-2009 08:14
scott at corelevel dot com
27-Nov-2006 10:47
27-Nov-2006 10:47
I was having a problem with a large script I need to run - was a loop through about 50,000 records and downloading several pictures for a bunch of them, and updating the database.
the problem came as I started getting visitors to my site, the server would get behind, run out of memory, iowait skyrockets, mysql slows down... was a total downhill spiral.
Use this to fix it.
$load = sys_getloadavg();
$sleep=5;
$maxload=2;
if ($load[0] > $maxload) {
sleep($sleep);
echo "Busy server - sleep $sleep seconds<br>";
}
I have to play with the load and the sleep number to find what worked for my script, but now my server does not bog at all.
surfchen at gmail dot com
06-Jul-2006 04:22
06-Jul-2006 04:22
the codes below will provide this function for order versions of PHP.
if (!function_exists('sys_getloadavg')) {
function sys_getloadavg()
{
$loadavg_file = '/proc/loadavg';
if (file_exists($loadavg_file)) {
return explode(chr(32),file_get_contents($loadavg_file));
}
return array(0,0,0);
}
}
tom pittlik
03-Mar-2006 10:36
03-Mar-2006 10:36
The code below mimics the output of sys_getloadavg(). You may have to tweak the way the substring is captured for different distros.
<?
function sys_getloadavg_hack()
{
$str = substr(strrchr(shell_exec("uptime"),":"),1);
$avs = array_map("trim",explode(",",$str));
return $avs;
}
print_r(sys_getloadavg_hack());
// Array
// (
// [0] => 6.24
// [1] => 4.92
// [2] => 3.99
// )
?>
This function is a neat way of running low priority or non-essential cron jobs on a busy server - if the load is high, don't continue with the task (and try again in a few minutes time).