These parameters have to be determined based on available server resources such as RAM and CPU.įor instance, the total processes that run in a server would be approximately = (Total RAM / Memory per process). PHP-FPM has a lot of configuration parameters which determine the way it performs. The PHP-FPM process manager is determined after assessing the available server memory, traffic spikes, website pages, CPU usage, etc. But the overhead increases when there is so much traffic fluctuation. This type helps to manage varying traffic in memory restrained servers. In ondemand type, the PHP-FPM processes are spawned only on demand, based on the traffic. In static type, the number of child processes is fixed by pm.max_children parameter, but this type is not flexible for a server with changing web traffic. In dynamic type, the number of child processes is set dynamically based on the PHP-FPM parameters in conf file. The performance of the service drastically varies based on this type. Process manager is mainly of 3 types – dynamic, ondemand and static. This helps us to pinpoint the culprit and take prompt actions to fix it. When we debug such load issues, we analyze the logs and server performance over a period of time. The first thing server owners tend to do for an immediate fix, is to restart the PHP-FPM service. But simply restarting the service is only a band-aid solution, and you will soon see the load spiking. How to perform PHP-FPM tuning for high load
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