Apache memory usage optimization

Apache is using too much of my server memory causing it to crash. I have 4GB of RAM in the server.

I'm trying to fine tune Apache settings in order to improve it's performance but I'm quite new at this.

I was trying to follow this article's advice but I'm not sure how to calculate things and it seems I'm making it worse.

My top reads like:

11697 apache    15   0  322m  37m 4048 S  0.0  0.9   0:00.52 httpd
13602 apache    15   0  323m  37m 3944 S  0.0  0.9   0:00.50 httpd
11786 apache    15   0  322m  36m 4052 S  0.0  0.9   0:00.50 httpd
12525 apache    15   0  322m  36m 4040 S  0.0  0.9   0:00.63 httpd

11806 apache    15   0  322m  36m 3952 S  0.0  0.9   0:00.42 httpd
11731 apache    15   0  322m  36m 4036 S  0.0  0.9   0:00.46 httpd
11717 apache    16   0  322m  36m 3956 S  0.0  0.9   0:00.54 httpd
11659 apache    15   0  322m  36m 3980 S  0.0  0.9   0:00.49 httpd

So, it would be

MaxClients = 3000/ (322-37) = 10

Is that right? Also, what should be the values for the other parameters such as MinSpareServers, MaxSpareServers,MaxRequestsPerChild, StartServers, MinSpareThreads, MaxSpareThreads, ThreadsPerChild, MaxRequestsPerChild ?

Would someone please help me?

Update

I've tried what you guys have suggested. It works, but just for a while. After some time after the server is started memory usage keeps increasing and never goes down.

I mean, after I start the server, let's assume there'are 500 users online. Server will consume X RAM. 2 hours after that, with the same 500 users online, server will be consuming 10X RAM.

Is there a way to avoid this or I'll have to keep watching the server and restarting it from time to time?

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