looking for explanations on linux memory management

[Mickael Bailly <mickael.bailly@telintrans.fr>]

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	Hello!,

first of all I hope this is the god mailing-list to ask this question to. If 
it's not please redirect me to a better mailing list.

I'm working in a big company, we are in a step of heavy linux servers 
deployement. So my question is a little bit "corporate" :-)

1/ Hardware
We are working on SMP 2.8GHz Pentium Xeon Hyperthread
We have between 2 and 2.5 gigas of RAM.

2/ Kernel
We are using RedHat kernel 2.4.20-20.7 (last kernel upgrade for RedHat 7.3)
Of course on the servers the '-smp' RPM is used.

3/ Software
Those servers are not really overloaded: the main process is a Lotus domino 
(notes) server. Other softwares are nagios, apache, bind, and some java apps.
Load rarely get over 0.3

Memory usage: 
In the attached graph you can see last month memory usage for this host.

1/ can you explain me what happened in week 47 so cached memory don't get down 
anymore ? Nothing really changed in this week on the server.
2/ how can I know when my server needs more RAM/SWAP, if free memory is always 
about 0
3/ can you tell me where to find PER PROCESS memory usage (/proc/[process 
id]/stat ? /proc/[process id]/statm ? ) 

Thanks


-- 
Mickael Bailly

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