Recommendation for PHP-FPM pm.max_children, PHP-FPM pm.start_servers and others

Posted by jaypabs on Server Fault See other posts from Server Fault or by jaypabs
Published on 2013-07-01T04:26:35Z Indexed on 2013/07/01 23:07 UTC
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I have the following server:

Intel® Xeon® E3-1270 v2 Single Processor - Quad Core Dedicated Server
CPU Speed: 4 x 3.5 Ghz w/ 8MB Smart Cache
Motherboard: SuperMicro X9SCM-F
Total Cores: 4 Cores + 8 Threads
RAM: 32 GB DDR3 1333 ECC
Hard Drive: 120GB
Smart Cache: 8MB

I am using ubuntu 12.04 - nginx, php, mysql with ISPConfig 3.

Under ISPConfig 3 >> website settings:

I have this default value:

PHP-FPM pm.max_children = 10
PHP-FPM pm.start_servers = 2
PHP-FPM pm.min_spare_servers = 1
PHP-FPM pm.max_spare_servers = 5
PHP-FPM pm.max_requests = 0

My question is what is the recommended settings for the above variable? Because I found some using a different settings.

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