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);
// [ ... ]
}
}
}
}
}
?>
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