simultaneously exec multiple shell_exec() commands?

Question

Hi so i am wondering if somebody can offer me a solution..

I have multiple instances of a php script i would like to run at once, I can semi achieve this using shell_exec() and not waiting for a response apart from the pid. This works wonderfully. However when doing this with the method below it works well for 100 or so executes but I need it to execute around 1000 times and it is taking too long to loop around the foreach and execute 1 by one.

Example:

 $items = $array(daatabase entries);

   foreach($items as $i){
    $pid = shell_exec("execute the process.php");
   }

Now assuming there are < 100 this will take around 1 second or so to exec which is OK however i need to run loads of these and this will take 10-20 seconds.

Is there any way of sending the commands in bulk rather than 1 at a time?

Thanks

no I don't need the result - i already just get the pid back — MHCH
– MHCH, Commented Mar 29, 2017 at 8:28
$pid = shell_exec("nohup nice -n 10 /usr/local/bin/php -c /opt/cpanel/ea-php71/root/etc/php.ini -f /home/USER/public_html/files/crons/test_process.php > /dev/null & echo $!") — MHCH
– MHCH, Commented Mar 29, 2017 at 8:34
well, you are sending your commands to background , so this is weird that iterating over 1000 rows takes all that time. — hassan
– hassan, Commented Mar 29, 2017 at 8:41

markdwhite · Accepted Answer · 2017-03-29 08:24:20Z

1

Something like pthreads perhaps?

https://www.sitepoint.com/parallel-programming-pthreads-php-fundamentals/ (The most recent result I could find)

answered Mar 29, 2017 at 8:24

markdwhite

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2 Comments

MHCH Over a year ago

Not looked at pthreads yet, I have heard this is an option though

markdwhite Over a year ago

I don't believe it's core PHP but seems to be well established. The only alternative I've tried was to call an endpoint which carries out the action using curl with a short timeout. Exactly like this: stackoverflow.com/questions/35874707/…

Harikrishnan · Accepted Answer · 2017-04-01 03:11:24Z

0

You can execute process.php in background without waiting for execution completion. So it will be faster. Also shell_exec() function returns only output, not pid. If you need pid you have to use exec() function.

   $items = $array(daatabase entries);
   foreach($items as $i){
      shell_exec("execute the process.php > /dev/null 2>&1");
   }

answered Apr 1, 2017 at 3:11

Harikrishnan

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