Re: Command-line PHP script CPU usage goes sky-high, stays there--why?

On 10-Dec-07, at 5:20 PM, Jim Lucas wrote:

Tom Rogers wrote:

Hi, Tuesday, December 11, 2007, 6:42:18 AM, you wrote: RF> Hello, Put a usleep(1000) in the listen while() loop and give the cpu a break.

This makes me think about asking if you have to short of a timeout on your receiving connection?

One second on stream_socket_server(), with a 900 second timeout stream_socket_accept().

What are you using to setup your connection? fsockopen() or stream_socket_server() ? here is a snippet of what I have [...]

Thanks for sharing your code. Seems pretty similar to mine at first glance.

I don't have a timeout set on the *_recvfrom() call. I just wait until the next connection comes in. You don't need to use mysql_pconnect(), especially if you are using, what in essence is, a daemon.

Yeah, after thinking about it, that's what I figured. Thanks for confirming though.

Just don't open and close the connection constantly, leave it open.

Yes, I just open it once at the top of the script. And that's it.

Also, make sure you are not using an array that you are not re-initializing through each iteration of the loop. If the array keeps getting bigger, PHP might $*%& on itself. Always re-initialize arrays to clean them up. Hope some of this helps!

All good advice. I will check my arrays, although I don't think this is a problem since I monitor the scripts memory usage with memory_get_usage() and memory_get_peak_usage(), and it never tops 3MB (max allocated is 16MB). There are a few little parts to the daemon. One thing I'm doing that could be problematic is running an include(); on a couple files each time a socket has new data (this allows me to adjust the processing logic on the fly without having to start the script and wait for clients to reconnect)--but I can see this being expensive in terms of performance and resources. Actually, I wonder if THAT is not what's starving the script of resources over time--each fread() involves several includes(); I'll have to look into that... FWIW, here's the stripped-down skeleton of the server: As always, constructive criticism is very welcome. <?php $socket = stream_socket_server("tcp://127.0.0.1:9876", $errno, $errstr); if ($socket) { $master[] = $socket; $read = $master; $write = $master; while (1) { $read = $master; $write = $master; $mod_fd = stream_select($read, $_w = NULL, $_e = NULL, 1); if ($mod_fd === FALSE) { break; } for ($i = 0; $i < $mod_fd; ++$i) { if ($read[$i] === $socket) { // NEW SOCKET $conn = stream_socket_accept($socket, 900); $master[] = $conn; $key_num = array_search($conn, $master, TRUE); } else { $sock_data = fread($read[$i], 32768); if (strlen($sock_data) === 0) { // CONNECTION GONE $key_to_del = array_search($read[$i], $master, TRUE); fclose($read[$i]); unset($master[$key_to_del]); } elseif ($sock_data === FALSE) { // CONNECTION BROKEN $key_to_del = array_search($read[$i], $master, TRUE); fclose($read[$i]); unset($master[$key_to_del]); } else { // READ INCOMING DATA // include (somefiles); // include (somefiles); // include (somefiles); // [ ... ] } } } } } ?>