Web студия "GrandView"

Описание

array sys_getloadavg ( void )

This function 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.

Замечание: Для Windows-платформ эта функция не реализована.

Примеры

Пример 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.'); } ?>

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sys_getloadavg

scott at corelevel dot com
27-Nov-2006 02:47


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 09:22


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 02:36


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).

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sys_getloadavg

Описание

Возвращаемые значения

Примеры