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Created March 22, 2020 08:54
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Adjusting child processes for PHP-FPM (Nginx)
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php-pools.md

Adjusting child processes for PHP-FPM (Nginx)

Determine if the max_children limit has been reached.

  • sudo grep max_children /var/log/php?.?-fpm.log.1 /var/log/php?.?-fpm.log

Determine system RAM and average pool size memory.

  • free -h
  • All fpm processes: ps -ylC php-fpm7.0 --sort:rss
  • Average memory: ps --no-headers -o "rss,cmd" -C php-fpm7.0 | awk '{ sum+=$1 } END { printf ("%d%s\n", sum/NR/1024,"M") }'
  • All fpm processes memory: ps -eo size,pid,user,command --sort -size | awk '{ hr=$1/1024 ; printf("%13.2f Mb ",hr) } { for ( x=4 ; x<=NF ; x++ ) { printf("%s ",$x) } print "" }' | grep php-fpm

Calculate (pm.max_children = Total RAM dedicated to the web server / Max child process size)

  • System RAM: 2GB
  • Average Pool size: 85Mb
  • pm.max_children = 1500MB / 85MB = 17

Configure

sudo vim /etc/php/7.0/fpm/pool.d/www.conf

pm.max_children = 17
pm.start_servers = 2
pm.min_spare_servers = 1
pm.max_spare_servers = 3
pm.max_request = 1000
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