nixCraft

Winston · #1 (**permalink**) 18-06-2007, 08:40 PM

Hi,

This is my first thread, so go easy on me. I have a question which hope someone will enlighten me.

I'm running Apache 2.2.4 and php 4.4.7. When I do a 'top', the memory usage showing I'm using 628472k of 969624k memory, However the load is very low, below 1

just wondering, is it normal Apache will allocated a portion of memory even it is not used at the moment ?

Winston

nixcraft · #2 (**permalink**) 18-06-2007, 09:36 PM

Welcome to forum!

Yes it is very common on Linux and UNIX commands to consume all free memory. Basically OS caches all frequently used files in memory and server them from memory. Here is output from my system:

Code:

free -m

Output:

Code:

  total       used       free     shared    buffers     cached
Mem:          2008       1595        412          0         58        718
-/+ buffers/cache:        818       1189
Swap:         1027          0       1027

My system load

Code:

uptime

Output:

Code:

 11:03:29 up 137 days, 11:23,  1 user,  load average: 0.16, 0.10, 0.09

Look at the buffers/cache line. In short as long as your load is below 5 (<5) and disk i/o under control nothing to worry

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