Surely you were faced with a task when writing large file parsers or when writing high-load scripts — faced with the processor being 100% loaded and if this happens on the server, then other users cannot access the resources — I also encountered this problem. only a year after the problem occurred, in my opinion, was it possible to find a satisfactory solution.

The task is actually this: the load on the processor should not exceed n% (n you set yourself). Actually it is only for high-load processes that means that the server acts as a computer for you.

If you know how to not load the processor at 100% server settings - put the answers here. If it is necessary to edit a question or answer - I will do it - just specify what to edit in the comment.

  • habrahabr.ru/post/106381 - KoVadim
  • 20 is the lowest priority, but this, on the other hand, is the most polite process. I already have all processes with this priority - there is no place to lower - Mcile
  • You can improve others. If all processes lower priority, it will not remove the load on the processor. Loading 100% in the case of the Linux server does not say anything. If the admin writes about this - expel him. You need to ask about load average. - KoVadim

1 answer 1

The answer to this question was an article about how to measure processor load, based on the above functions - this is how you managed to solve the problem of controlling the load on the processor

function onRequestStart() { $dat = getrusage(); define('PHP_TUSAGE', microtime(true)); define('PHP_RUSAGE', $dat["ru_utime.tv_sec"]*1e6+$dat["ru_utime.tv_usec"]); } function getCpuUsage() { $dat = getrusage(); $dat["ru_utime.tv_usec"] = ($dat["ru_utime.tv_sec"]*1e6 + $dat["ru_utime.tv_usec"]) - PHP_RUSAGE; $time = (microtime(true) - PHP_TUSAGE) * 1000000; // cpu per request if($time > 0) { $cpu = sprintf("%01.2f", ($dat["ru_utime.tv_usec"] / $time) * 100); } else { $cpu = '0.00'; } return $cpu; } $start=time(); onRequestStart();//запускается в начале скрипта $a=1000000; $size=10000000; $counter=0; $timeout=100000; for($i=0;$i<=$size;$i++){ $a+=100; if(getCpuUsage()>80){//если загрузка процессора достигла 80% погружаем процесс на одну сотую секунды в сон usleep($timeout); ++$counter; } } $end=time()-$start; echo 'Спал '.$timeout*$counter/1000000 .' секунд; ушло времени '.$end.' c'; gc_disable(); //чистка мусора из памяти сервера

here are the test results

 $timeout=1000000; //Спал 8 секунд; ушло времени 48 c - результатов не дало - процессор загружался на 100% $timeout=100000; //Спал 7.5 секунд; ушло времени 46 c $timeout=10000; //Спал 7.95 секунд; ушло времени 48 c $timeout=1000; //Спал 7.888 секунд; ушло времени 49 c $timeout=100; //Спал 5.3308 секунд; ушло времени 50 c $timeout=10; //Спал 1.18124 секунд; ушло времени 47 c $timeout=1; //Спал 0.152863 секунд; ушло времени 50 c

in all cases except the first, the processor load did not exceed 85% of the htop results - perhaps this is due to the fact that htop is updated once a second

I also noticed that with a decrease in sleep time, the number of falling asleep increases from 3,500 to 250,000, with a total of 10,000,000 cycles