Comparison Graph
| DSO | CGI | SUPHP | FASTCGI | |
|---|---|---|---|---|
| Low CPU usage | ✔ | ✔ | ||
| Low Memory consumption | ✔ | ✔ | ||
| Runs PHP as site owner instead of Apache | only w/ suEXEC | ✔ | ✔ | |
| Good security | ✔ | ✔ |
Reference from: http://boomshadow.net/tech/php-handlers/
PHP-FPM (reference)
PHP-FPM = all fcgid + advantage of a shared APC cache for all processes.
mod_php vs FastCGI (reference)
1.
when use mod_php, apache use less memory then FastCGI process
However, apache use less memory when using FastCGI which apache can process more static file requests
Apache pre-fork <= higher when many static files requested
fcgi 15 processes * (40 MB – 21 MB shared) + 21 MB shared + (20 Apache procs * 6 MB [120MB]) = 426 MB
Apache threaded MPM-Worker
fcgi 15 processes * (40 MB – 21 MB shared) + 21 MB shared + (10 Apache procs * 25 MB [250MB]) = 556 MB
mod_php 26 processes * (26 MB – 13 MB shared) + 13 MB shared = 351 MB
2. the number of MySQL threads went down dramatically, because only PHP processes will connect to it, and not every Apache process. Reduced from 15 connections to 1-2 connections
3. the number of network connections inside the server reduced from 1400 to around 200