# FastCGI Process Manager (FPM)

## Table of Contents

- Installation
- Configuration

FPM (FastCGI Process Manager) is an alternative PHP FastCGI implementation with some additional features (mostly) useful for heavy-loaded sites.

These features include:

- advanced process management with graceful stop/start;

- ability to start workers with different uid/gid/chroot/environment, listening on different ports and using different php.ini (replaces safe_mode);

- stdout and stderr logging;

- emergency restart in case of accidental opcode cache destruction;

- accelerated upload support;

- "slowlog" - logging scripts (not just their names, but their PHP backtraces too, using ptrace and similar things to read remote process' execute_data) that are executed unusually slow;

- fastcgi_finish_request() - special function to finish request and flush all data while continuing to do something time-consuming (video converting, stats processing etc.);

- dynamic/static child spawning;

- basic SAPI status info (similar to Apache mod_status);

- php.ini-based config file.