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SubjectRe: 2.1.131: Strange percent idle time measurement
On Mon, 7 Dec 1998, Pavel Machek wrote:

> > Some questions arise:
> >
> > 1. 101% is obviously wrong and should never be reported.
> > Is this a "top" thing, or a number reported by the kernel?
>
> Top is so broken that it does not surprise me.

We should get some volunteer to rewrite top so that it
uses the time stats from /proc/stat instead of doing
expensive calculations to produce stats full of errors
itself :)

> > 2. The idle time shows some interesting jumps.
> > I'd expect 0% all the time. Is this top's calculations again?
>
> It can be exited proces. If proces exits before top can see it, its
> time will be reported as idle. This can be easily seen while compiling
> with kernel (top reports up-to 50% free cupu when in fact there's no
> free cpu...).

Using top and vmstat together on different terminals
will show this effect beautifully :)

cheers,

Rik -- the flu hits, the flu hits, the flu hits -- MORE
+-------------------------------------------------------------------+
| Linux memory management tour guide. H.H.vanRiel@phys.uu.nl |
| Scouting Vries cubscout leader. http://www.phys.uu.nl/~riel/ |
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