ScotlandPHP

sys_getloadavg

(PHP 5 >= 5.1.3, PHP 7)

sys_getloadavgOrtalama 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.

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User Contributed Notes 9 notes

up
20
rick at rctonline dot nl
5 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;
   
    }
?>
up
11
stanislav dot eckert at vizson dot de
1 year 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 . "%";
    }

?>
up
5
tom pittlik
11 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).
up
4
scott at corelevel dot com
10 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.
up
3
828586 at gmail dot com
7 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.');
        }
    }
}
?>
up
2
Anonymous
7 years ago
To get just current load avg, you can do :

<?php
$output
= shell_exec('cat /proc/loadavg');
$loadavg = substr($output,0,strpos($output," "));
?>
up
2
surfchen at gmail dot com
11 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);
    }
}
up
2
kexianbin at diyism dot com
3 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;
?>
up
0
vladvarna at gmail dot com
5 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);

?>
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