On March 22, 2011 12:21 , Tushar Chavan <tushar.cha...@hotmail.com>
wrote:
How can we define no of process those will listen ( Parent process ) &
how child threads will created for each process ( parent thread ) ?
( Also please let me default values of this processes & child threads )
The answer to these questions is determined by which Multi-Processing
Module (MPM) you choose to use with Apache HTTP Server.
The prefork MPM is available for Unix-like systems and creates a process
to handle each request. The StartServer, MinSpareServer,
MaxSpareServer, and MaxClient directives control how many processes get
started. To find out the default values of each of these directives,
see the documentation:
http://httpd.apache.org/docs/2.2/mod/prefork.html
The worker MPM is available for Unix-like systems and uses multiple
children each with multiple threads; a single child can handle multiple
requests simultaneously, and each request is handled by a separate
thread. The StartServers, MinSpareThreads, MaxSpareThreads, MaxClients,
and ThreadsPerChild directives control how many processes and threads
get started. More information (including default values for these
directives) is available in the documentation:
http://httpd.apache.org/docs/2.2/mod/worker.html
There are other MPMs, too, including mpm_winnt for Microsoft Windows
servers, mpm_netware for Netware servers, and others. For a complete
list and more information, see
http://httpd.apache.org/docs/2.2/mpm.html
Will these defined values be maintained in scoreboard data structure?
The purpose of the scoreboard is to keep track of the status of each
process or thread, and allow the multiple processes and threads to
communicate and coordinate with each other. There happen to be fields
in the scoreboard data structure for the maximum number of processes and
maximum number of threads, but, in general, all configuration directives
-- including all of the ones mentioned above -- are stored in Apache
HTTP Server's various configuration data structures. The details of how
these are stored are usually only important if you're writing your own
third-party modules, or contributing to the Apache HTTP Server code.
--
Mark Montague
m...@catseye.org
