Php showing 97% of CPU usage

Question

I have a game site developed using flash and php. The php code contains 4000 lines and it will run as a cron. Inside the code, there is one while loop which will run infinitely for checking any data is written in the socket and call different functions accordingly and will send the results back to the sockets. From flash, it will get the results and will be displayed.

The problem Im facing is, somewhere from the php code, it is leaking memory. Since it is very big, I can not find out from where it is happening. Moreover it can be run only as a cron. Is there any tool to find out the memory leakage ? I have heard about xdebug but I didnt use. Any other ?

check.php (as cron)

$sock = fsockopen(IP_ADDRESS, PORT, $sock_error_code, $sock_error_string, 10); if (!$sock){
      $message = "Server was down, restarting...\n\n";  
      $last_line = system("php -q gameserver/server.php", $retval);} else {
         $message = "Server is up...";
         $message .= $sock_error_string." (".$sock_error_code.")\n\n";}

server.php (only some part)

class gameserver {
var $server_running = true;
function gameserver() {
    global $cfg, $db;

    $this->max_connections = $cfg["server"]["max-connections"];

    $this->start_socket();

    echo "Gameserver initialized\n";
    while ($this->server_running) {
        $read = $this->get_socket_list();
        $temp = socket_select($read, $null, $null, 0, 15);
        if (!empty($read)) {
            $this->read_sockets($read);
        }
        $db->reconnection();
        $this->update_DB_records();
        $this->check_games_progress();

        if ($this->soft_shutdown && $this->active_games == 0) {
            $this->server_running = false;
            echo "soft shutdown complete\n";
        }
    }

    $this->stop_socket();

    echo "Server shut down\n";
}}        $server = new gameserver();

Posting some of your code would be helpful; otherwise, it's mostly a guessing game. — Jordan Ryan Moore
– Jordan Ryan Moore, Commented Dec 16, 2009 at 14:24
Posting the code IN THE QUESTION would be slightly more helpful. — anon
– anon, Commented Dec 16, 2009 at 15:08

Alistair Evans · Accepted Answer · 2009-12-16 14:22:27Z

5

Two things, first, ensure that you sleep at least once inside the loop, to ensure that you don't use 97% cpu.

Second, a trick I've found is, if there is any database activity, to call mysql_free_result (or it's equivalent for other DBMS') to free up the memory used to store the result of the query.

answered Dec 16, 2009 at 14:22

Alistair Evans

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2 Comments

binoy Over a year ago

I have added sleep(1) inside the loop, so now it is not using 97% of CPU. Hope this will not cause any other bottleneck issue later.. thanks for the reply..

Alistair Evans Over a year ago

You may want to consider how often your client is polling your server, and whether you can adjust the amount you sleep to further decrease the time spent running your script.

Isak Savo · Accepted Answer · 2009-12-16 14:15:06Z

5

Are you starting never-ending programs from CRON? Cron will start a new instance according to the schedule you specify and you'll end up with several running programs doing the same thing.. Could this be your problem?

answered Dec 16, 2009 at 14:15

Isak Savo

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2 Comments

Lizard Over a year ago

That makes complete sense... does it look like * * * * * if so you will try to run that cron every minute with an infinate loop called each time!

binoy Over a year ago

No.. Im sure it is only happening once.. plz have a look into my code

Pekka · Accepted Answer · 2009-12-16 14:17:12Z

2

I am assuming that you are not starting a new instance using cron every minute, and having each run an infinite loop:

XDebug is probably your best bet. Other than that, you could use memory_get_usage() and log memory usage in specific points of your loop.

Could it simply be that your script accumulates data and doesn't clean it up properly on the end of each loop?

answered Dec 16, 2009 at 14:17

Pekka

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3 Comments

binoy Over a year ago

No.. Im sure it is only happening once... ya, it may be accumulating data somewhere, but it is diificult to find out from 4000 lines

binoy Over a year ago

ok.. Even the following program showing 97% percentage of CPU usage if I run from the command prompt.. <?php $bool = true; while ($bool) { } ?> Any way to free up the CPU usage frequently ?

Pekka Over a year ago

might be worth a separate question.

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