8-4 網站伺服器效能優化

1. 可先參考以下文件：
   1. https://gist.github.com/holmberd/44fa5c2555139a1a46e01434d3aaa512
   2. https://blog.gtwang.org/linux/nginx-php-fpm-configuration-optimization/
   3. https://www.kancloud.cn/digest/php-src/136260
2. 找出目前可用記憶體：

   free -h

   root@ic:/etc/php/7.3/fpm/pool.d# free -h
                 total        used        free      shared  buff/cache   available
   Mem:          7.8Gi       988Mi       514Mi        39Mi       6.3Gi       6.7Gi
   Swap:         2.0Gi        30Mi       2.0Gi

   
   先計算每個php行程需要的記憶體，例如：38M

   ps --no-headers -o "rss,cmd" -C php-fpm7.3 | awk '{ sum+=$1 } END { printf ("%d%s\n", sum/NR/1024,"M") }'

   計算max_children數

   (6.7*1024)/38=180

    

3. 編輯php的設定檔

   vi /etc/php/7.3/fpm/pool.d/www.conf

   修改以下幾個設定項目：

   pm.max_children = 180
   pm.start_servers = 20
   pm.min_spare_servers = 5
   pm.max_spare_servers = 35
   pm.max_request = 10000

    

4. 最後重啟PHP

   systemctl restart php7.3-fpm