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 — Gets system load average
Description
array sys_getloadavg
( void
)
Returns three samples representing the average system load (the number of processes in the system run queue) over the last 1, 5 and 15 minutes, respectively.
Return Values
Returns an array with three samples (last 1, 5 and 15 minutes).
Examples
Example #1 A sys_getloadavg() example
<?php
$load = sys_getloadavg();
if ($load[0] > 80) {
header('HTTP/1.1 503 Too busy, try again later');
die('Server too busy. Please try again later.');
}
?>
Notes
Note: This function is not implemented on Windows platforms.
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).