PHP-FPM WARNINGメッセージ server reached pm.max_children setting の対応

Nid: 1206
  • Posted on: 24 January 2019
  • By: admin

WARNINGメッセージ

$ sudo tail -f /var/log/php7.2-fpm.log
[01-Jan-2019 11:21:55] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it
[01-Jan-2019 11:22:26] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it
[01-Jan-2019 11:29:52] WARNING: [pool www] server reached pm.max_children setting (5), consider raising it

PHP-FPM プロセス当たりの 平均使用メモリを求める。

$ ps --no-headers -o rss,cmd -C php-fpm7.2 | awk '{ sum+=$1 } END { printf ("%d%s\n", sum/NR/1024,"M") }'
94M
メモリ8GBを割り当てるとすると、

pm.max_children = Total RAM dedicated to the web server / Max child process size = 8000MB / 100MB = 80
プロセス当たり100MBとすると、最大で80

cpuコア数確認 
$ grep -i cores /proc/cpuinfo | uniq
cpu cores       : 8
pm.start_serversは、4xコア数=4x8=32。pm.min_spare_serversは、2xコア数=4x8=16。pm.max_spare_servers = pm.start_servers = 32 
$ sudo vi /etc/php/7.2/fpm/php-fpm.conf
pm.max_children = 80
pm.min_spare_servers = 16
pm.max_spare_servers = 32
pm.start_servers = 32
; Default Value: min_spare_servers + (max_spare_servers - min_spare_servers) / 2

$ sudo systemctl restart php7.2-fpm
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