Issue Multiple PHP-FPM master processes

[John W]

Server operating system version

CentOS 7.9

Plesk version and microupdate number

Plesk Obsidian 18.0.68 Update #2

It started over the weekend when my server spun up multiple PHP-FPM master processes. Even though the server load on average is below 2, the PHP response is really slow, taking a minute to load a basic WordPress page. Any idea what's causing it? I already restarted the service and server to no avail. Updated/patched PHP 8.2 didn't help. Upgraded and switched subscriptions to PHP 8.3, now multiple master processes for PHP 8.3 have spun up. TIA.

 

[Raul A.]

Do you use Dedicated PHP-FPM for any website?

 

[John W]

Do you use Dedicated PHP-FPM for any website?

Nope.

 

[Sebahat.hadzhi]

@John W can you check /var/log/plesk-php83-fpm/error.log please and let us know if anything is logged there?

 

[John W]

@John W can you check /var/log/plesk-php83-fpm/error.log please and let us know if anything is logged there?

The only thing that stands out is "server reached max_children". I've increased it from 10 to 20, but it didn't help.

 

[John W]

I double-checked all my sites, they're set to pm.max_children=20. The following error kept coming up:
WARNING: [pool plesk-php83-fpm.plesk-service.localdomain] server reached max_children setting (2), consider raising it

Any idea where that's located? Thanks.

 

[Sebahat.hadzhi]

Thanks, @John W . Can you please try following the steps from this guide and let us know if that helps?

 

[John W]

Thanks, @John W . Can you please try following the steps from this guide and let us know if that helps?

Hi @Sebahat.hadzhi,

The command returned "160 plesk-php82-fpm.plesk-service.localdomain" and the subsequent log query shows

==================================================
WARNING: [pool plesk-php82-fpm.plesk-service.localdomain] server reached max_children setting (2), consider raising it
==================================================

I confirmed that all my subscriptions are already set to pm.max_children=20. Where is the "plesk-php82-fpm.plesk-service.localdomain" variable configured?

Thanks,
John

 

[Sebahat.hadzhi]

Hey, John. If I am not mistaken, this is the global shared pool. Can you try increasing the max_children above 20 for the sake of testing?

 

[John W]

Am I supposed to modify /opt/plesk/php/8.2/etc/php.ini, /opt/plesk/php/8.2/etc/php-fpm.conf, or some other way?

 

[Sebahat.hadzhi]

I was referring to the domains you increased the limits for already. However, before you do that could you try: running

grep -r "pm.max_children" /opt/plesk/php/8.2/etc/php-fpm.d/