How do you calculate server load in PHP? - php

Question

How do you calculate the server load of PHP/apache? I know in vBulletin forums there's the server load displayed like 0.03 0.01 0.04 but it's not really understandable to a average joe. So I thought about a 1-100 percentile scale. I wanted to display a server load visual that reads from a DIV:
$load = $serverLoad*100;
<div class=\"serverLoad\">
<div style=\"width: $load%;\"></div>//show visual for server load on a 1-100 % scale
</div>
<p>Current server load is $load%</p>
</div>
However, I don't know how to detect server load. Is it possible to do turn this server load into a percentile scale? I don't know where to start. May someone please help me out?
Thanks.

Answer 1

I have a very old function that should still do the trick:
function getServerLoad($windows = false){
$os=strtolower(PHP_OS);
if(strpos($os, 'win') === false){
if(file_exists('/proc/loadavg')){
$load = file_get_contents('/proc/loadavg');
$load = explode(' ', $load, 1);
$load = $load[0];
}elseif(function_exists('shell_exec')){
$load = explode(' ', `uptime`);
$load = $load[count($load)-1];
}else{
return false;
}
if(function_exists('shell_exec'))
$cpu_count = shell_exec('cat /proc/cpuinfo | grep processor | wc -l');
return array('load'=>$load, 'procs'=>$cpu_count);
}elseif($windows){
if(class_exists('COM')){
$wmi=new COM('WinMgmts:\\\\.');
$cpus=$wmi->InstancesOf('Win32_Processor');
$load=0;
$cpu_count=0;
if(version_compare('4.50.0', PHP_VERSION) == 1){
while($cpu = $cpus->Next()){
$load += $cpu->LoadPercentage;
$cpu_count++;
}
}else{
foreach($cpus as $cpu){
$load += $cpu->LoadPercentage;
$cpu_count++;
}
}
return array('load'=>$load, 'procs'=>$cpu_count);
}
return false;
}
return false;
}
This returns processor load. You can also use memory_get_usage and memory_get_peak_usage for memory load.
If you can't handle finding percentages based on this... sigh, just post and we'll try together.

Answer 2

This function in PHP might do that trick: sys_getloadavg().
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.

Answer 3

function get_server_load()
{
$serverload = array();
// DIRECTORY_SEPARATOR checks if running windows
if(DIRECTORY_SEPARATOR != '\\')
{
if(function_exists("sys_getloadavg"))
{
// sys_getloadavg() will return an array with [0] being load within the last minute.
$serverload = sys_getloadavg();
$serverload[0] = round($serverload[0], 4);
}
else if(#file_exists("/proc/loadavg") && $load = #file_get_contents("/proc/loadavg"))
{
$serverload = explode(" ", $load);
$serverload[0] = round($serverload[0], 4);
}
if(!is_numeric($serverload[0]))
{
if(#ini_get('safe_mode') == 'On')
{
return "Unknown";
}
// Suhosin likes to throw a warning if exec is disabled then die - weird
if($func_blacklist = #ini_get('suhosin.executor.func.blacklist'))
{
if(strpos(",".$func_blacklist.",", 'exec') !== false)
{
return "Unknown";
}
}
// PHP disabled functions?
if($func_blacklist = #ini_get('disable_functions'))
{
if(strpos(",".$func_blacklist.",", 'exec') !== false)
{
return "Unknown";
}
}
$load = #exec("uptime");
$load = explode("load average: ", $load);
$serverload = explode(",", $load[1]);
if(!is_array($serverload))
{
return "Unknown";
}
}
}
else
{
return "Unknown";
}
$returnload = trim($serverload[0]);
return $returnload;
}

Answer 4

If "exec" is activated
/**
* Return the current server load
* It needs "exec" activated
*
* e.g.
* 15:06:37 up 10 days, 5:59, 12 users, load average: 1.40, 1.45, 1.33
* returns
* float(1.40)
*/
public function getServerLoad()
{
preg_match('#(\d\.\d+),[\d\s\.]+,[\d\s\.]+$#', exec("uptime"), $m);
return (float)$m[1];
}

Answer 5

<?php
$load = sys_getloadavg();
if ($load[0] > 0.80) {
header('HTTP/1.1 503 Too busy, try again later');
die('Server too busy. Please try again later.');
}
?>

Answer 6

Its Pretty easy in LAMP environment if you have proper permissions,
print_r(sys_getloadavg());
OUTPUT : Array ( [0] => 0 [1] => 0.01 [2] => 0.05 )
Array values are average load in the past 1, 5 and 15 minutes respectively.

Answer 7

Here is a windows/linux compatible php server load function:
function get_server_load() {
$load = '';
if (stristr(PHP_OS, 'win')) {
$cmd = 'wmic cpu get loadpercentage /all';
#exec($cmd, $output);
if ($output) {
foreach($output as $line) {
if ($line && preg_match('/^[0-9]+$/', $line)) {
$load = $line;
break;
}
}
}
} else {
$sys_load = sys_getloadavg();
$load = $sys_load[0];
}
return $load;
}

Answer 8

function _loadavg()
{
if(class_exists("COM"))
{
$wmi = new COM("WinMgmts:\\\\.");
$cpus = $wmi->InstancesOf("Win32_Processor");
foreach ($cpus as $cpu)
{
return $cpu->LoadPercentage;
}
}
}