Solution:
on my 32GB server I changed these values in the file:
/etc/php/7.4/fpm/pool.d/www.conf
to:
pm.max_children = 128
; The number of child processes created on startup.
; Note: Used only when pm is set to ‘dynamic’
; Default Value: (min_spare_servers + max_spare_servers) / 2
; 15
pm.start_servers = 32
; The desired minimum number of idle server processes.
; Note: Used only when pm is set to ‘dynamic’
; Note: Mandatory when pm is set to ‘dynamic’
; 15
pm.min_spare_servers = 32
; The desired maximum number of idle server processes.
; Note: Used only when pm is set to ‘dynamic’
; Note: Mandatory when pm is set to ‘dynamic’
; 8
pm.max_spare_servers = 96
This will create a lot more tasks on the server, but it’s now stable. Also these numbers are kind of reflecting the size of memory which the application can use. Never the less, I’m a single person using Nextcloud! so I’m not sure if this is the right way, for a large installation. And this only happend after the upgrade to v23!
roman