memory comsumption in Apache

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hi,

I'm trying to predict how many memory should be used with Apache2.2.3
(worker) + Linux2.6.x. This setup is only serving static content, and
trying to serve 10000 simultaneous users (about 10000 connections,500
simultaneous requests at the same time).

I have several questions below.
1. How many memory is used for holding one connection across software
layers (including kernel TCP/IP stack and apache)?
2. How many memory is used for holding one request across software
layers (including kernel TCP/IP stack and apache)?
3. If memory is exhausted and total connections are not exceeded the
MaxClients limit (that means Apache will return no mem), what happens
if a new connection coming? Apache send "503" or "500" error? And also
what happens if a new request coming in a keepalived connection?
Apache send "503" or "500"? Does Apache have a pending handling
mechanism (I mean holding the connection or request till memory is
available, and not sending error message to clients) when out of
memory?

Thanks in advance.

Thx, Xuekun

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