Re: Executing functions or scripts in parallel

Many parts of this script were found at the following site: http://www.sitepoint.com/article/udp-portscanning-php This script isn't totally mine. I've just adapted it to my needs and it is working quite well, telling me when a service is up or down ... read the article for further details. Anyway, my question was about concurrent script running. My script is working the way I needed it to and all I need now is a way to fasten it. I still think it's a little bit slow by many aspects, maybe because I'm not a programmer and I've written a code that is not so good or fast, or there is no way to have all my servers services checked in parallel. Thanks in advance. Felipe Martins On 5/30/06, Jochem Maas <jochem@iamjochem.com> wrote:

Phil Martin wrote: Sure, sorry about that. I have a function that tells me if the host is DOWN or UP. I want to run this function in parallel for each host I monitor. The function is the following: function servstatus($remote_ip, $remote_ip_port, $remote_ip_proto) { if ($remote_ip_proto == "tcp") {

       $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);

       // Turning Off Warning Messages
       $i_error_old=error_reporting();
       error_reporting($i_error_old & ~ (E_WARNING));

       if ($connect = socket_connect($socket, "$remote_ip", "" .

$remote_ip_port . "")) {

               return true;

the following 3 statements will never be run.

               socket_set_block($socket);
               socket_close($socket);
               unset($connect);
       } else {
               return false;

the following 3 statements will never be run.

               socket_set_nonblock($socket);
               socket_close($socket);
               unset($connect);}

my guess is you know even less about sockets, especially blocking/non-blocking than I do! } else { why are you making the distinction between udp and tcp in this way?

       // Turning off Warning Messages
       $i_error_old=error_reporting();
       error_reporting($i_error_old & ~ (E_WARNING));

       $socket = fsockopen("udp://$remote_ip", "$remote_ip_port",

&$errno, &$errstr, 2);

       $timeout = 1;

       if (!$socket) {

if you don't get the socket why does that mean the service is up?

               return true;
       }

       socket_set_timeout ($socket, $timeout);
       $write = fwrite($socket,"\x00");
       if (!$write) {

again if you can't write why does that mean the service is up?

               return true;
       }

       $startTime = time();
       $header = fread($socket, 1);
       $endTime = time();
       $timeDiff = $endTime - $startTime;

       if ($timeDiff >= $timeout) {

why does a time measurement mean the service is up?

               fclose($socket);
               return true;
       } else {
               fclose($socket);
               return false;
       }
       }

} Thanks in advance Felipe Martins On 5/30/06, Dave Goodchild <buddhamagnet@gmail.com> wrote:

On 30/05/06, Phil Martin <darkinner.lists@gmail.com> wrote:

Hi everyone,

      I've made a very basic and small function to suit my needs in

monitoring some hosts services. I've noticed that the script is a

little

bit slow because of the number of hosts and services to monitor. Is there

a

way to execute my function servstatus(); in parallel with every hosts to increase the speed ?

      Thanks in advance.

[]'s Felipe Martins

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