Real Memory Usage
Miller, Joe
joe.miller at us.mizuho-sc.com
Tue Feb 22 18:14:17 UTC 2005
I've had the same problem here with linux memory utilization. The kernel
on linux does not work the way windows work. It grabs as much memory as
it can and performs page swapping when necessary.
Knowing that, you should really be monitoring used swap space in MRTG.
Check out OID .1.3.6.1.2.1.25.2.3.1.6.102 which is a better indicator
for memory monitoring with MRTG.
-----Original Message-----
From: redhat-list-bounces at redhat.com
[mailto:redhat-list-bounces at redhat.com]On Behalf Of Bill Matthews
Sent: Tuesday, February 22, 2005 12:59 PM
To: General Red Hat Linux discussion list
Subject: Real Memory Usage
Hello,
I have a box running RHEL 3 with 2GB of RAM. I am graphing memory
usage with MRTG.
The box consistant runs at 5% CPU, but 95% memory usage. So something
is using a heck of a lot of RAM. The box just has some basic services
on it (web server, mrtg, etc). So I'm not sure what could be using
that much RAM.
Being new to Linux...how do I tell what processes are using how much
memory?
Here's an output from vmstat
vmstat 5 5
procs memory swap io system
cpu
r b swpd free buff cache si so bi bo in cs us sy
wa id
0 0 0 291788 149368 1368452 0 0 2 3 2 3 2
1 0 7
0 1 0 291876 149368 1368448 0 0 0 739 137 103 3
3 0 95
0 1 0 292128 149368 1368452 0 0 0 370 164 50 1
0 1 98
0 0 0 292344 149368 1368456 0 0 0 135 136 215 1
2 0 96
0 0 0 291968 149368 1368456 0 0 0 112 312 204 2
1 0 98
So you can see it only has 300MB of memory free, meaning 1.7GB is
used. The only commands I'm familiar with our ps -aef and top.
top shows %MEM but almost all processes are 0.0%. Some are 0.5 or 0.1.
Not sure where to look?
Thanks
BM
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