"top" shows different CPU usage than "ps faux"

[Mertens, Bram]

>


Mazda Motor Logistics Europe NV, Blaasveldstraat 162, B-2830 Willebroek
VAT BE 0406.024.281, RPR Mechelen, ING  310-0092504-52, IBAN : BE64 3100 0925 0452, SWIFT : BBRUBEBB

-----Original Message-----
> From: redhat-list-bounces at redhat.com [mailto:redhat-list-
> bounces at redhat.com] On Behalf Of redhatter
> Sent: maandag 6 februari 2012 13:16
> To: General Red Hat Linux discussion list
> Subject: "top" shows different CPU usage than "ps faux"
>
> Hi,
>
> I just noticed that "top" shows a CPU usage percentage markedly
> different than "ps faux" for example.
>
> In this case, a java process running at 433% in "ps faux" is shown as
> runnging at 661.4% in "top"
>
> Both programs get their data from the /proc filesystem I imagine, so
> there could be a summation bug in either of them.
>
> Or is there some rational explanation?
>
> Best reagrds,

Just a guess but doesn't ps show a point in time while top shows an average of the last X seconds?

Regards

Bram