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PHP Session Garbage Collection: The unknown performance bottleneck

Link – May 9th 2016

Here is one performance setting in your PHP configuration you probably haven't thought about much before: How often does PHP perform random garbage collection of outdated session data in your application? Did you know that because of the shared nothing architecture PHP randomly cleans old session data whenever session_start() is called? An operation that is not necessarily cheap.

https://tideways.io/profiler/blog/php-session-garbage-collection-the-unknown-performance-bottleneck

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