最後更新: 2021-08-09

介紹

Prefork 與 Worker 的分別

Prefork: Each child process handles one connection at a time

Worker: Uses multiple child processes which each have multiple threads

Event MPM

A variant of the worker MPM with the goal of consuming threads only for connections with active processing

 * mod_php is only compatible with the Prefork MPM

mpm_prefork_module (Multi-Processing Module)

implements a non-threaded, pre-forking web server

a parent process manages the size of the server pool.
(compatibility with non-thread-safe libraries)

#  worker and event default to "StartServers 3"

StartServers 5

# An idle process is one which is not handling a request.

# If there are fewer than MinSpareServers idle, then the parent process creates new children:

# It will spawn one, wait a second, then spawn two, wait a second, then spawn four (exponentially)

MinSpareServers 5

#If you are trying to set the value equal to or lower than MinSpareServers,

#Apache HTTP Server will automatically adjust it to MinSpareServers + 1.

MaxSpareServers 10

# sets the limit on the number of simultaneous requests that will be served
# Any connection attempts over the MaxRequestWorkers limit will normally be queued
# (up to  "ListenBacklog 511")
# Once a child process is freed at the end of a different request, the connection will then be serviced.

MaxRequestWorkers 256

# the maximum configured value for MaxRequestWorkers for the lifetime of the Apache httpd process.

ServerLimit 256