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-   -   "top" shows different CPU usage than "ps faux" (http://www.linux-archive.org/red-hat-linux/629470-top-shows-different-cpu-usage-than-ps-faux.html)

redhatter 02-06-2012 11:16 AM

"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,

-- David

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"Mertens, Bram" 02-07-2012 07:09 AM

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


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-----Original Message-----
> From: redhat-list-bounces@redhat.com [mailto:redhat-list-
> bounces@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

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