我的系統是 Ubuntu 20 + Nginx + Php7.4-fpm ，遇到不能安裝程式，安裝到一半都會停掉，去檢查 /var/log/php7.4fpm.log ，發現出現 warning message
warning : [pool www] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers), spawning 32 children, there are 0 idle, and 15 total children
我的解決方法是去到 /etc/php/7.4/fpm/pool.d 下打開 www.conf
sudo nano /etc/php/7.4/fpm/pool.d/www.conf
然後改善 pm 的相關設定值，以我的機器為例，16GB RAM，CPU 4 顆，我的設定值參考公式為
pm.start_servers = min_spare_servers + (max_spare_servers - min_spare_servers) / 2
所以我修改的參數如下
pm = dynamic pm.max_children = 32768 pm.start_servers = 10 pm.min_spare_servers = 10 pm.max_spare_servers = 10 pm.max_requests = 5000
修改完畢之後，重啟就不會看到問題了
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