I have a script that is called from crontab. :
0,5,10,15,20,25,30,35,40,45,50,55 * * * * /usr/bin/php /var/www/settime.php
I checked back later and notice many instances of php running:
root@mypi:~# ps aux |grep settime
root 1646 0.0 0.0 1856 380 ? Ss 10:20 0:00...