[CentOS] Tracking down whats causing a high load?
Ian mu
mu.llamas at gmail.com
Wed Jun 21 12:24:50 UTC 2006
Hiya, thanks for the replies, very useful and has given me some food for
thought on a few things.
Used rkhunter which is fine apart from one app out of date which I've now
updated, chkrootkit its clear but chkproc gives a couple of processes not in
readdir output, but they correspond to apps we are running when I check in
/proc/pid/cmdline so think that sides looking ok (still checking a couple of
bits though).
The strange one was on the vmstat 5 suggestion, the r (waiting for runtime)
column is pretty much 0, if the load is > 1 shouldn't that be mostly > 1
also, or am I misunderstanding the load definition?
I.e currently load is 1.98
procs -----------memory---------- ---swap-- -----io---- --system--
----cpu----
r b swpd free buff cache si so bi bo in cs us sy id
wa
0 0 624 34652 66608 1059564 0 0 1 9 0 0 3 1
96 0
0 0 624 34436 66608 1059564 0 0 0 39 1207 2534 1 1
97 0
0 0 624 34268 66608 1059564 0 0 0 42 1202 2412 1 1
98 0
0 0 624 34140 66608 1059564 0 0 0 33 1197 2427 1 1
98 0
0 0 624 34140 66608 1059564 0 0 0 0 1196 2427 1 1
98 0
0 0 624 34188 66608 1059632 0 0 0 37 1205 2545 2 1
97 0
1 0 624 34196 66608 1059632 0 0 0 0 1197 2392 1 1
98 0
0 0 624 34444 66608 1059632 0 0 0 33 1200 2430 1 1
98 0
0 0 624 34260 66608 1059632 0 0 0 0 1198 2441 1 1
98 0
0 0 624 34132 66608 1059632 0 0 0 37 1210 2592 1 1
97 0
0 0 624 34204 66608 1059632 0 0 0 34 1207 2502 1 1
98 0
0 0 624 34268 66608 1059632 0 0 0 33 1201 2433 1 1
98 0
Cheers, Ian
On 6/21/06, Chris Mauritz <chrism at imntv.com> wrote:
>
> Ian mu wrote:
> > Hiya,
> >
> > Currently running Centos 4.2 x86_64 dist on a dual 3G xeon, 2G ram,
> > scsi setupand everythings been running fine on it for some time. Then
> > at 4am last night something kicked in (have mrtg running monitoring
> > when) and since then its been running a load of about 1.5 (normally
> > around 0.4). CPU usage is Cpu(s): 1.1% us, 0.6% sy, 0.0% ni, 97.9%
> > id, 0.2% wa, 0.1% hi, 0.1% si.
> >
> > Can't see any new processes that would cause the load, just wondering
> > is there any way to try and track down whats actually causing this?
> > It's not excessive load, but want to add some new services and wary
> > now, its something that seems wrong given the sudden increase at 4am
> > (think thats when some o.s housekeeping tasks are normally scheduled,
> > but there's none running that I can see that started today).
> >
> > Just hoping someone may have some tips on checking whats always
> > waiting or how to isolate whats happening. As said, ps -ef shows no
> > new processes, and cpu usage is very low.
> >
>
> Have you been up to date with patches? Have you tried running rkhunter
> and chkrootkit to see if you've been burgled? One of the first things a
> rootkit does is replace things like ps so it's processes become
> "invisible."
>
> Cheers,
>
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