Apache: request, thread and so on

Hi,

I would like to better understand Apache interals, basically for the sake of performance.

I am not a developer, so it is a bit unclear the relation between a thread and a process.

Furthermore, I would like to know how Apache handles "requests": I get a webpage, I get several images, css, and other contents.
Is every "object" a request?
Or is it a single (network) connection able to delivery so many contents?
I read so many times Apache official documentation, but certain topics still remain a mystery..
Can you suggest me a good starting point (website, book) to improve my Apache knownledge?
Thank you!

Most common in Apache is to understand the prefork module which is the default method of controlling how requests are handled. Note this is specific to 2.4 but they are all pretty much the same concept, even going back to Apache 1

Apache MPM prefork
http://httpd.apache.org/docs/2.4/mod/prefork.html

Additional throttles sometimes used are the rlimit directives. Typically these are hand crafted depending on hardware. If I remember correctly this was specific to Apache 2? There are other limits as well but the three most common are CPU MEM and PROC.

CPU
http://httpd.apache.org/docs/2.2/mod...html#rlimitcpu

MEM
http://httpd.apache.org/docs/2.2/mod...html#rlimitmem

PROC
http://httpd.apache.org/docs/2.2/mod...ml#rlimitnproc

This article is a bit dated but should still be useful.

Apache 2 - HowTo - Tune Apache
https://sites.google.com/site/zenars...---tune-apache