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Determining maximum load for Apache on Linux

Posted on 1998-02-24
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Last Modified: 2012-08-13
Hello:

Is there a "General Formula" that I can use to determine how many simultaneous connections I can support to my HTTP Daemon (apache1.1.) ???

I'm running Linux 2.0 on a Pentium-90 with 32M RAM, 1.1 Gig HD, and a T-1 connection to the internet.

Thanks.
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Question by:xtian120897
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jhance earned 100 total points
ID: 1636424
In most cases, the limit for HTTP transactions will be the data link (i.e. the T-1 line) and not the computer.  If all you are doing is serving up HTML pages, then CPU horsepower is not much of a factor.  You can calculate the acceptable user load something like this:

(Max Simultaneous Users) = ((NET BW)/(CONNECT RATE))/(Max Acceptable Slowdown)

NET BW = Your Network Bandwidth (1.54 M bits/sec)

CONNECT RATE = Your customer's average connection bit rate (you might use 28,800 or higher depending on how they connect and the nature of the data.  Text compressed to as much as 115,000 b/s, images don't compress at all.)

Max Acceptable Slowdown = A fraction representing speed (1.0 = no slowdown, 0.5 = 1/2 speed, 0.1 = 1/10 speed)

So an example might be:

USERS = (1,540,000/33,600)/0.75 = 61 users
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by:xtian120897
ID: 1636425
Thanks for your help and quick turnaround!!! :)
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