PM on demand vs Dynamic?

djsmiley2k · Mar 17, 2018

In terms of speed, which is better for PHP-FPM configurations?
I see almost PHP-FPM have configurations like this

Code:

[pool_name]
...
pm = [B]dynamic[/B]
pm.max_children = 5
pm.start_servers = 3
pm.min_spare_servers = 2
pm.max_spare_servers = 4
pm.max_requests = 200

What if I change to

Code:

pm = ondemand

Any advice?

VirtuBox · Mar 17, 2018

Hello djsmiley2k,

for the most part of websites, ondemand mode for php-fpm will be better than dynamic, because ondemand mode will spawn new php-fpm child process if needed and will kill them when child process are idle.
Here the configuration I use on my servers :

Code:

pm = ondemand
pm.max_children = 5
pm.max_spare_servers = 1
pm.min_spare_servers = 1
pm.process_idle_timeout = 10s
pm.start_servers = 1

VirtuBox · Mar 17, 2018

Sorry the was an error in my configuration when I have copied it, the correct configuration is :

Code:

pm = ondemand
pm.max_children = 5
pm.max_spare_servers = 1
pm.min_spare_servers = 1
pm.process_idle_timeout = 10s
pm.start_servers = 1

This example work fine for any website with low/medium traffic.

For websites with more traffic, I use the following configuration :

Code:

pm = ondemand
pm.max_children = 100
pm.start_servers = 20
pm.min_spare_servers = 10
pm.max_spare_servers = 30
pm.process_idle_timeout = 10s
pm.max_requests = 500

VirtuBox · Mar 17, 2018

For high traffic website, I just set a higher amount of child process in my php-fpm configuration.
The directive pm.max_requests = 500 only set the number of requests each child process should execute before respawning, it's an useful directive to avoid high-memory usage in case of memory leak with php applications.

PM on demand vs Dynamic?

djsmiley2k

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VirtuBox

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djsmiley2k

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