Date: Wed, 31 Jul 2002 17:43:49 +0200 From: K.J.Koster@kpn.com To: jcborkow@tcpns.com Cc: hackers@FreeBSD.ORG Subject: RE: CPU context switching/load numbers Message-ID: <59063B5B4D98D311BC0D0001FA7E452205FDA8BC@l04.research.kpn.com>
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Dear Jason,
>
> I have an inconsistency that I am trying to explain. When I
> do a "w" command
> on the box, I see this:
>
> 7:31PM up 74 days, 39 mins, 1 user, load averages: 1.12, 0.94, 0.93
>
> This says I have a load of 1.12 over the past minute, or, for every
> available CPU interval, I have 1.12 processes requesting the CPU.
>
> However, if I do a vmstat, I see this:
>
> procs memory page disks faults cpu
> r b w avm fre flt re pi po fr sr w0 w1 in
> sy cs us sy id
> 0 0 0 221896 58512 3 0 0 0 4 0 0 0 78
> 169 78 1 14 85
>
> This tells me the CPU is 85% idle, and spends 14% of its time
> running system
> processes and 1% of the time running user processes (such as
> the shell I am
> using to console into the box with).
>
Please be careful with the vmstat output. It presents an average over a
longer period of time. I'm not sure what it does precisely. Run "vmstat 2",
ignoring the very first line of numbers. I got this wisdom from the book
named "System Performance Tuning". I highly recommend it to anyone who wants
to tune his or her box.
Kees Jan
=====================================================
You can't have everything. Where would you put it?
[Steven Wright]
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