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My team is using PHP-FPM, configured statically with a max of 32 processes, in a Kubernetes cluster. We're autoscaling based on PHP-FPM metrics, and there are many replicas. I'm frequently (i.e. on all replicas) seeing the PHP-FPM status show queued connections, even though the max active processes is below total processes. For example:

pool:                 www
process manager:      static
start time:           06/Feb/2025:17:37:07 +0000
start since:          80556
accepted conn:        265772
listen queue:         0
max listen queue:     2
listen queue len:     511
idle processes:       27
active processes:     5
total processes:      32
max active processes: 21
max children reached: 0
slow requests:        0

Note that the max active processes is 21 of the 32 available, but that the listen queue has reached 2. Why are connections being queued when there are idle processes?

本文标签： Why does PHPFPM queue connections when max active processes is less than total processesStack Overflow

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