<?php  

if($fp = @fopen('/proc/loadavg', 'r')) {
    list($loadaverage) = explode(' ', fread($fp, 6));
    echo  'loadaverage:';
    echo $loadaverage;

     fclose($fp);
     
    if($loadaverage > 2) {
        header("HTTP/1.0 503 Service Unavailable");
        echo 'server die ';
        exit();
    }
}
/**
* ¼ÇÂ¼·þÎñÆ÷¸ºÔØ¡¢ÄÚ´æÊ¹ÓÃ¡¢cpu×´Ì¬,½»»»·ÖÇø
* Ã¿10Ãë¼ì²âÒ»´Îò
*/
//while(1){  
    exec('top -b -n 1 -d 3',$out);  
    $Cpu = explode('  ', $out[2]);  
    $Mem = explode('  ', $out[3]);  
    $Swap = explode('  ', $out[4]);  
    //var_dump($Cpu,$Mem,$Swap);  
      
    $cpu = str_replace(array('%us,',' '),'',$Cpu[1]);  
    $mem = str_replace(array('k used,',' '),'',$Mem[2]);  
    $swap = str_replace(array('k cached',' '),'',$Swap[5]); 
    date_default_timezone_set('Asia/Shanghai');  
    echo date('  y-m-d h:i:s').'CPU '.$cpu.'   MEM'.intval($mem/1024).'   SWAP'.intval($swap/1024).chr(10);  
  //  sleep(10);  
//}
?>