PHPFPM on highload tips

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.