How to limit CPU usage from within a PHP script / module

Question

What is the best way to limit PHP scripts CPU usage from within that script? I am not looking to re-nice the whole PHP system process, but rather keep a PHP script running for longer and adjusting the CPU usage of that script. Basically, it would need to "renice" itself dynamically and specifically to only the script or it would need to slow down the computations / activities it is doing.

Tried proc_nice(), but could not get PHP to increase CPU usage of other scripts after my script finished. The change in my script affected other subsequent scripts/requests. This is, when used in my script, and after increasing the nice level, the nice value stayed for the PHP process in the system.

You said: "Tried proc_nice(), but could not get it to increase cpu usage", did you really mean "increase"? — KIKO Software
– KIKO Software, Commented Jun 25, 2019 at 12:07
Maybe it's not an option for you, but personally I'd scale the infra to cope with the demand, or spread the processes out over multiple instances / machines. They're pretty cheap (even free sometimes depending on the scenario). Just a thought based on very limited information. — Jonnix
– Jonnix, Commented Jun 25, 2019 at 12:14
Did you use a positive or negative increment? Also why would this affect other scripts? — Capsule
– Capsule, Commented Jun 26, 2019 at 3:59
I was able to change the nice level downwards, but it worked for the whole PHP process. This was OK when my script was running, but could not reset it to default after the script ended. I will clarify this in the question. — Rado
– Rado, Commented Jun 27, 2019 at 14:09

KIKO Software · Accepted Answer · 2019-06-25 12:06:29Z

1

You could usleep() at regular intervals in your code. This will delay script execution for a given number of microseconds leaving more time for other processes.

answered Jun 25, 2019 at 12:06

KIKO Software

17.5k3 gold badges33 silver badges53 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Rado Over a year ago

I will try this and also will check if my script can check overall CPU use to adjust the 'usleep()' duration accordingly.

Collectives™ on Stack Overflow

How to limit CPU usage from within a PHP script / module

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related