PHP-FPM tuning: Using ‘pm static’ for Max Performance
Let's take a very quick look at how best to set up PHP-FPM for high throughput, low latency, and a more stable use of CPU and memory. By default, most setups have PHP-FPM’s PM (process manager) string set to dynamic and there’s also the common advice to use ondemand if you suffer from available memory issues. However, let's compare the two management options based on php.net’s documentation and also compare my favorite for high traffic setup --- static pm:
pm = dynamic: the number of child processes is set dynamically based on the following directives: pm.max_children, pm.start_servers, pm.min_spare_servers, pm.max_spare_servers.
pm = ondemand: the processes spawn on demand when requested, as opposed to dynamic, where pm.start_servers are started when the service is started.
pm = stat...