high latency

[Andreas Ericsson]

On 12/02/2010 08:38 PM, Daniel Wittenberg wrote:
> Someone else noticed that nagios is generating a ton of minor page
> faults, and curious if that's normal and if that could be causing some
> of the latency in the checks?

define "a ton"

$ /usr/bin/time php -r 'echo "marsipulami\n";'
marsipulami
0.01user 0.01system 0:00.09elapsed 34%CPU (0avgtext+0avgdata 29104maxresident)k
10208inputs+0outputs (70major+1962minor)pagefaults 0swaps

That's with a reasonably simple program, and it generates 70 major and 1962
minor pagefaults.

>  I've also got a tmpfs setup for the
> status.dat and the checkresults directory to ease some of the disk i/o
> since we're on a san-backed vm host.
> 

That's good, although if you're using a virtual system you'll never know
for sure if you're really using a ramdisk or not, since the host system
might well use swap to store the ramdisk anyway.

> I turned off embedded perl this morning and our latency has been holding
> at<  10 seconds so far, so that seemed to help a lot.
> 

Neat. Did it affect your pagefaults? If so, how?

-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Tel: +46 8-230225                  Fax: +46 8-230231

Considering the successes of the wars on alcohol, poverty, drugs and
terror, I think we should give some serious thought to declaring war
on peace.

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