sys_getloadavg
(PHP 5 >= 5.1.3, PHP 7, PHP 8)
sys_getloadavg — システムの平均負荷を取得する
パラメータ
この関数にはパラメータはありません。
例
例1 sys_getloadavg() の例
<?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.');
}
?>注意
注意: この関数は Windows 環境にはまだ実装されていません。
＋add a note
User Contributed Notes 13 notes
stanislav dot eckert at vizson dot de ¶
8 years ago
Function to get current CPU load as percentage value under Windows and Linux.
Note: Function is getServerLoad(). It will return a decimal value as percentage of current CPU load or NULL if something went wrong (e. g. insufficient access rights).
<?php
header("Content-Type: text/plain");
function _getServerLoadLinuxData()
{
if (is_readable("/proc/stat"))
{
$stats = @file_get_contents("/proc/stat");
if ($stats !== false)
{
// Remove double spaces to make it easier to extract values with explode()
$stats = preg_replace("/[[:blank:]]+/", " ", $stats);
// Separate lines
$stats = str_replace(array("\r\n", "\n\r", "\r"), "\n", $stats);
$stats = explode("\n", $stats);
// Separate values and find line for main CPU load
foreach ($stats as $statLine)
{
$statLineData = explode(" ", trim($statLine));
// Found!
if
(
(count($statLineData) >= 5) &&
($statLineData[0] == "cpu")
)
{
return array(
$statLineData[1],
$statLineData[2],
$statLineData[3],
$statLineData[4],
);
}
}
}
}
return null;
}
// Returns server load in percent (just number, without percent sign)
function getServerLoad()
{
$load = null;
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
{
if (is_readable("/proc/stat"))
{
// Collect 2 samples - each with 1 second period
// See: https://de.wikipedia.org/wiki/Load#Der_Load_Average_auf_Unix-Systemen
$statData1 = _getServerLoadLinuxData();
sleep(1);
$statData2 = _getServerLoadLinuxData();
if
(
(!is_null($statData1)) &&
(!is_null($statData2))
)
{
// Get difference
$statData2[0] -= $statData1[0];
$statData2[1] -= $statData1[1];
$statData2[2] -= $statData1[2];
$statData2[3] -= $statData1[3];
// Sum up the 4 values for User, Nice, System and Idle and calculate
// the percentage of idle time (which is part of the 4 values!)
$cpuTime = $statData2[0] + $statData2[1] + $statData2[2] + $statData2[3];
// Invert percentage to get CPU time, not idle time
$load = 100 - ($statData2[3] * 100 / $cpuTime);
}
}
}
return $load;
}
//----------------------------
$cpuLoad = getServerLoad();
if (is_null($cpuLoad)) {
echo "CPU load not estimateable (maybe too old Windows or missing rights at Linux or Windows)";
}
else {
echo $cpuLoad . "%";
}
?>
rick at rctonline dot nl ¶
12 years ago
Here is another one that also works on windows. Note that this method is not fast, so be careful in the number of calls to this function.
<?php
function get_server_load() {
if (stristr(PHP_OS, 'win')) {
$wmi = new COM("Winmgmts://");
$server = $wmi->execquery("SELECT LoadPercentage FROM Win32_Processor");
$cpu_num = 0;
$load_total = 0;
foreach($server as $cpu){
$cpu_num++;
$load_total += $cpu->loadpercentage;
}
$load = round($load_total/$cpu_num);
} else {
$sys_load = sys_getloadavg();
$load = $sys_load[0];
}
return (int) $load;
}
?>
Chris Wheeler ¶
3 years ago
It is important to note that sys_getloadavg() does not return a percentage, and the numbers that it returns are completely meaningless if you do not know the number of CPU cores. To get the number as a percentage you need to divide the value by the number of CPU cores in the system. (eg: if the value is 0.5 and you have two cores, then you are using 25% of the CPU on average). Here is a simple function to get the values as a percent:
<?php
function percentloadavg(){
$cpu_count = 1;
if(is_file('/proc/cpuinfo')) {
$cpuinfo = file_get_contents('/proc/cpuinfo');
preg_match_all('/^processor/m', $cpuinfo, $matches);
$cpu_count = count($matches[0]);
}
$sys_getloadavg = sys_getloadavg();
$sys_getloadavg[0] = $sys_getloadavg[0] / $cpu_count;
$sys_getloadavg[1] = $sys_getloadavg[1] / $cpu_count;
$sys_getloadavg[2] = $sys_getloadavg[2] / $cpu_count;
return $sys_getloadavg;
}
?>
scott at corelevel dot com ¶
18 years ago
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.
Anonymous ¶
15 years ago
To get just current load avg, you can do :
<?php
$output = shell_exec('cat /proc/loadavg');
$loadavg = substr($output,0,strpos($output," "));
?>
tom pittlik ¶
18 years ago
The code below mimics the output of sys_getloadavg(). You may have to tweak the way the substring is captured for different distros.
<?php
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).
kexianbin at diyism dot com ¶
10 years ago
Use this:
<?php
$loads=sys_getloadavg();
$core_nums=trim(shell_exec("grep -P '^physical id' /proc/cpuinfo|wc -l"));
$load=$loads[0]/$core_nums;
echo $load;
?>
surfchen at gmail dot com ¶
18 years ago
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($loadavg_file));
}
return array(0,0,0);
}
}
828586 at gmail dot com ¶
14 years ago
equivalent for windows
<?php
ob_start();
passthru('typeperf -sc 1 "\processor(_total)\% processor time"',$status);
$content = ob_get_contents();
ob_end_clean();
if ($status === 0) {
if (preg_match("/\,\"([0-9]+\.[0-9]+)\"/",$content,$load)) {
if ($load[1] > get_config('busy_error')) {
header('HTTP/1.1 503 Too busy, try again later');
die('Server too busy. Please try again later.');
}
}
}
?>
seb dot gibbs at ymail dot com ¶
1 month ago
// To get correct number of CPU cores
// as to calculate correct usage
function getCpuCores() {
// Linux
if (stristr(PHP_OS, 'linux')) {
// First, try /proc/cpuinfo
if (file_exists('/proc/cpuinfo')) {
preg_match_all('/^processor/m', file_get_contents('/proc/cpuinfo'), $matches);
if ($matches[0]) return count($matches[0]);
}
// Fallback: Use nproc command
return (int)shell_exec('nproc');
}
// macOS
if (stristr(PHP_OS, 'darwin')) {
return (int)shell_exec('sysctl -n hw.physicalcpu');
}
// Windows
if (stristr(PHP_OS, 'win')) {
// Try wmic command first
$cpuCount = shell_exec('wmic cpu get NumberOfLogicalProcessors');
if ($cpuCount) {
preg_match('/\d+/', $cpuCount, $matches);
if (isset($matches[0])) return (int)$matches[0];
}
// Fallback: Use environment variable
return (int)getenv('NUMBER_OF_PROCESSORS');
}
// If failed
return false;
}
// Example usage
// get CPU cores
$cores = getCpuCores();
if (is_Numeric($cores)) {
$corePerc = 100/$cores;
} else {
$corePerc = 100;
$cores = 'Unknown';
}
echo '<div><b>CPU:</b> '.$cores .' cores</div>';
// show correct CPU usage
echo '<blockquote>';
$cpu = sys_getloadavg();
echo(round($cpu[0]*$corePerc) .'% - last min<br>');
echo(round($cpu[1]*$corePerc) .'% - last 5 mins<br>');
echo(round($cpu[2]*$corePerc) .'% - last 15 mins<br>');
echo '</blockquote>';
Anonymous ¶
3 years ago
simple function to get the cpu load with availability to most os platforms because I haven't actually been able to find a similar protocol if you happen to be testing out various os platforms...
function cpu_load():?string {
$load='';
if(strtolower(PHP_OS_FAMILY)=="windows") {
exec("wmic cpu get loadpercentage /all",$out);
if($out) {
foreach($out as $line) {
if($line&&preg_match("/^[0-9]+\$/",$line)) {
$load=$line;
break;
}
}
}
} else {
$load=sys_getloadavg();
}
return $load;
}
wowabbs+php at gmail dot com ¶
4 years ago
<?php // Usage processor in Windows using FFI
if(!dl("ffi")) // Load the extension
throw new Exception('Cound not load the FFI extension.');
function GetSystemTimes()
{
static $Kernel32;
$Kernel32??=FFI::cdef(<<<'IDL'
bool GetSystemTimes(long long *IdleTime, long long *KernelTime, long long *UserTime);
int GetLastError();
IDL, 'Kernel32.dll');
$IdleTime = FFI::new('long long');
$KernelTime = FFI::new('long long'); // already has idle time
$UserTime = FFI::new('long long');
if($Kernel32->GetSystemTimes(FFI::addr($IdleTime), FFI::addr($KernelTime), FFI::addr($UserTime)))
return [
'Idle' =>$IdleTime ->cdata,
'Kernel' =>$KernelTime ->cdata, // already has idle time
'User' =>$UserTime ->cdata,
];
return [];
}
function GetSystemTimesDelta()
{
static $Last=null;
static $Delta=[0,1];
$Times=GetSystemTimes();
$Last??=$Times;
$Idle =$Times['Idle' ]-$Last['Idle' ];
$All =$Times['Kernel' ]-$Last['Kernel' ]+ // Kernel already has idle time
$Times['User' ]-$Last['User' ];
if($All>1_000_000) // 100ms
{
$Delta=[$Idle, $All];
$Last=$Times;
}
return $Delta;
}
function ProcessorLoad()
{
static $Load=0;
[$Idle, $All]=GetSystemTimesDelta();
if($All>0.0)
$Load=1-$Idle/$All;
return $Load;
}
function KbHit()
{
Static $Sys;
$Sys??=FFI::cdef('bool _kbhit();', 'msvcrt.dll');
return $Sys->_kbhit();
}
while(!KbHit())
{
echo str_pad((string)round(ProcessorLoad()*100), 3, ' ', STR_PAD_LEFT), "%\n";
sleep(1);
}
?>
vladvarna at gmail dot com ¶
12 years ago
You can emulate loadavg using this. Can also be used to get iowait
<?php
function ProcStats()
{
$fp=fopen("/proc/stat","r");
if(false===$fp)
return false;
$a=explode(' ',fgets($fp));
array_shift($a); //get rid of 'cpu'
while(!$a[0])
array_shift($a); //get rid of ' '
var_dump($a);
fclose($fp);
return $a;
}
$a=ProcStats();
sleep(5);
$b=ProcStats();
$total=array_sum($b)-array_sum($a);
$loadavg = round(100* (($b[0]+$b[1]+$b[2]) - ($a[0]+$a[1]+$a[2])) / $total, 2); // user+nice+system
$iowait= round(100* ($b[4] - $a[4])/$total,2);
?>