When you running a highload website with PHP-FPM via FastCGI, the following tips may be useful to you : )
1. Compile PHP』s modules as less as possible, the simple the best (fast);
2. Increas PHP FastCGI child number to 100 and even more. Sometime, 200 is OK! ( On 4GB memory server);
3. Using SOCKET PHP FastCGI, and put into /dev/shm on Linux;
4. Increase Linux 「max open files」, using the following command (must be root): # echo 『ulimit -HSn 65536′ >> /etc/profile # echo 『ulimit -HSn 65536 >> /etc/rc.local # source /etc/profile
5. Increase PHP-FPM open file description rlimit: # vi /path/to/php-fpm.conf Find 「<value name=」rlimit_files」>1024</value>」 Change 1024 to 4096 or higher number. Restart PHP-FPM.
6. Using PHP code accelerator, e.g eAccelerator, XCache. And set 「cache_dir」 to /dev/shm on Linux.