So we both want a basic CPU utilisation alert.
Cool.
Hopefully somebody on the list has done this before.
If not, it's time to do a bit of scripting.
If I have to do it myself, I will post the results, if you are interested.
Regards
Vernon
"Kern, Thomas" <user-f1ebafb19faf@xymon.invalid> wrote on 13/09/2007 12:56:08 PM:
On the mainframes, we are used to lots of tasks waiting for various
resources. Main memory, virtual memory, I/O, etc all are important
and can be tuned fairly well. When that tuning isn't quite right,
throughput can be degraded but the pain is not as bad as when the
CPU gets overloaded. CPU is one resource that is hard to change, I
have run systems that needed to be less than 50% busy and others
that the boss wanted at 100% and wished for 110% busy.
The CPU value can also be the first indication of a runaway user or
bad database query (this is our most common problem). Once we know
from the CPU utilization that something is wrong, we can look for
the cause and maybe the other problems are there too.
Thomas Kern
XXX-XXX-XXXX
----- Original Message -----
From: user-527f88d7eddb@xymon.invalid
<user-527f88d7eddb@xymon.invalid>
To: user-ae9b8668bcde@xymon.invalid <user-ae9b8668bcde@xymon.invalid>
Sent: Thu Sep 13 00:23:43 2007
Subject: Re: [hobbit] CPU utilisation alerts
It might be different in mainframe world, but in Unix world, you
need to look at both the run queue length, IO stats and the CPU
utilisation to get an idea of what's happening.
If your CPU is at 100% and your run queue is still small, it's
probably just a hefty process chugging along, like a compile.
If your run queue is huge, and growing, and your CPU isn't yet at
100% you need to look at your IO. Disk, memory, swap, any resource
that could be generating contention and IO wait.
If there is major contention for these resources you need to look at
adding more, or utilising them differently - spread data across
multiple disks or mirror the disk to increase read throughput, that
sort of thing.
If your run queue is huge, and growing, and CPU is at 100%, while IO
is low, it's probably time to move to a new server, or find the
developer and tell him to fix his bugs. :-)
So absolute CPU utilisation on its own, isn't particularly
meaniingful, but if that's what the PHBs want, let's give it to them.
Regards
Vernon
"Kern, Thomas" <user-f1ebafb19faf@xymon.invalid> wrote on 13/09/2007 12:07:37 PM:
I would prefer that the cpu test be the data from the vmstat command
instead of the load values. I am used to a mainframe system and cpu
utilization is more useful that queue length. All of my Linux
systems are guests on a mainframe system so their individual cpu
utilizations is not as important as the values from my first level
system and I am working on a client side test for that.
Thomas Kern
XXX-XXX-XXXX
----- Original Message -----
From: user-527f88d7eddb@xymon.invalid <vernon.
user-a775cb9af9f5@xymon.invalid>
To: user-ae9b8668bcde@xymon.invalid <user-ae9b8668bcde@xymon.invalid>
Sent: Wed Sep 12 23:56:43 2007
Subject: Re: [hobbit] CPU utilisation alerts
Hi Thomas
Thanks for your quick response.
A client side script would work, but I was thinking I cannot be the
first person to need this, and that somebody else has already
invented the wheel.
(I hate reinventing stuff)
Alternatively, I was hoping that Henrik has some magic switch or
config setting that will make it work.
Regards
Vernon
"Kern, Thomas" <user-f1ebafb19faf@xymon.invalid> wrote on 13/09/2007 11:46:07
AM:
I don't know if you can alert off one of the values in one of the
trends graphs. That might take some back-end modifications.
But you could write a simple client-side script to do the same
command that is parsed for the trends graphs (vmstat, I think),
totaling the cpu utilization values and sending a simple status
message with the appropriate g/y/r color. The hobbit can do the
alert.
Thomas Kern
XXX-XXX-XXXX
----- Original Message -----
From: user-527f88d7eddb@xymon.invalid <vernon.
user-a775cb9af9f5@xymon.invalid>
To: user-ae9b8668bcde@xymon.invalid <user-ae9b8668bcde@xymon.invalid>
Sent: Wed Sep 12 23:36:07 2007
Subject: [hobbit] CPU utilisation alerts
Hi all
I'm baaaack :-)
For those who might have missed me, I spent a few months contracting
for a company that standardised on BMC Patrol. Wouldn't even
look at Hobbit.
BMC is a horrible package, expensive, not very extensible, with a
huge client footprint and overhead, and is very prone to crashing.
Sad product.
But no matter, I am now trying to satisfy my new company that Hobbit
is the one monitor to rule them all, and my new colleagues have
identified a "deficiency".
This has probably been asked and answered before, but here is
whatthey want.
I have been asked to generate a yellow/red status when absolute CPU
utilisation reaches predetermined thresholds.
Yes, I know, without looking at the run-queue this figure is not
very meaningful, but this is what they want.
The la1 graph in the trends column does an excellent job of graphing
the CPU utilisation, but how do I configure an alert based on that
figure?
Regards
Vernon
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