PHP pm

cat /etc/php/7.*/fpm/pool.d/www.conf | grep pm | grep -v ";"
listen = /run/php/php7.2-fpm.sock
pm = dynamic
pm.max_children = 8
pm.start_servers = 2
pm.min_spare_servers = 1
pm.max_spare_servers = 3

; Choose how the process manager will control the number of child processes.
; Possible Values:
;   static  - a fixed number (pm.max_children) of child processes;
;   dynamic - the number of child processes are set dynamically based on the
;             following directives. With this process management, there will be
;             always at least 1 children.
;             pm.max_children      - the maximum number of children that can
;                                    be alive at the same time.
;             pm.start_servers     - the number of children created on startup.
;             pm.min_spare_servers - the minimum number of children in 'idle'
;                                    state (waiting to process). If the number
;                                    of 'idle' processes is less than this
;                                    number then some children will be created.
;             pm.max_spare_servers - the maximum number of children in 'idle'
;                                    state (waiting to process). If the number
;                                    of 'idle' processes is greater than this
;                                    number then some children will be killed.
;  ondemand - no children are created at startup. Children will be forked when
;             new requests will connect. The following parameter are used:
;             pm.max_children           - the maximum number of children that
;                                         can be alive at the same time.
;             pm.process_idle_timeout   - The number of seconds after which
;                                         an idle process will be killed.
; Note: This value is mandatory.

See also

• PHP-fpm, /etc/php/7.*/fpm/pool.d/, pm., pm.max_children
• PHP, php-fpm, www.conf, php -i, PHP sessions, symfony, fastcgi_pass, sessionclean (shell script),phpsessionclean.service (systemd service), phpquery, php.ini, /var/log/php*, PECL, php --help, PHPUnit, Laravel, PHP framework, Composer, phpbrew, Xdebug, php --version, PHP Fatal error, Hello, World! (php)]