See https://gist.github.com/edcoreweb/866d57a1251fbf31ca30705b06cf327a
sudo vim /etc/php/7.1/fpm/pool.d/www.conf
sudo vim /etc/php/5.6/fpm/pool.d/www.conf
pm.start_serverspm.min_spare_serverspm.max_spare_servers
pm = ondemandpm.max_children = 50pm.max_requests = 500php_admin_value[memory_limit] = 1000M
php-fpm7.1 -t
php-fpm5.6 -t
sudo service php7.1-fpm restart
sudo service php5.6-fpm restart
sudo service apache2 restart