Re: Understanding the APACHE 1.3 process model

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you likely have 23 established connections using server processes and an additional number of server processes available to handle new connections. Apache keeps some number of processes available so that it doesn't have to fork the process at the time the request is made, but instead has the process ready to go. There are httpd.conf parameters to specify the minimum and maximum of these to keep available.

--
Michael Conlen

On Sep 27, 2007, at 10:39 PM, Robinson Craig wrote:

Hi Folks,

I'm trying to clarify my understanding of the APACHE 1.3 process model
on Solaris UNIX.

As I understand, "Apache 1.3 on UNIX is a pre-forking process per
request server". This means that Apache effectively needs 1 HTTP process per 1 concurrently connected client. For example, if [StartServers 5] is
set in httpd.conf, Apache starts with 6 HTTPD processes (5 childs + 1
parent). If there were 20 concurrently connected clients, then there
would be 21 HTTPD processes.

Firstly, is this correct understanding?

If so, my next question is thus:

What constitutes a "concurrently connected client"? At a moment in time,
if I run the following netstat command on a Solaris machine:

netstat -P tcp -n | grep ".80 " | grep -v TIME_WAIT | wc -l

I get '45', which is constituted as follows, with the following TCP
statuses:

23 x ESTABLISHED
1  x FIN_WAIT_1
20 x FIN_WAIT_2
1  x LAST_ACK
--
45

However, if I count the number of HTTPD processes at this same point in
time per '/usr/ucb/ps -auxww | grep httpd | wc -l', I get '35'.

Therefore, either my first premise above is wrong...or I am not
measuring the number of 'concurrently connected clients' accurately.

Any enlightenment will be appreciated.

Cheers, Craig

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