How to monitor the execution of a shell_exec script?

Question

PHP

There are many users in the database, every day we collect information about them by crown, for example, according to their subscribers in social networks. networks, there can be half a million of them, and collecting information on them can take a very large number. time.
Now the question becomes, how to follow them? In case one falls?
I tried to set the status if we are working with this user, but it turned out that it could fall and the status of working with the user remained the same...

Answer 1

Jobs are placed in a queue .
You start a number of daemons and process jobs from the queue.
Daemon control (startup, restart, quantity control) - supervisor .