[cod] OT: /proc, top, ps broken in some linux kernels?

[Steven Hartland]

Yes I've just been speaking to the coder of top / ps and
it appears that its quite possible for a process to use 90%
cpu but say its using 0% in both top and ps as process usage
is only sampled on clock tick so if you have a process which
gets scheduled but never uses and entire tick worth of cpu
before yielding it will never get shown. With the lower
frequency 2.4 kernel this has a high chance of happening
than the higher frequency 2.6 kernel.
Personally I would say this is a major design flaw in linux
as it makes any sort of cpu comparison tests null and void.

    Steve / K
----- Original Message ----- 
From: "Josh Berry" <games at chickenmonkey.co.uk>
To: <cod at icculus.org>
Sent: Wednesday, June 02, 2004 1:42 PM
Subject: Re: [cod] OT: /proc, top, ps broken in some linux kernels?


> Try graphing load average when running and comparing it to when the box
> is not running the game. That will give you a much better idea of what
> sort of resources the game is using.
> 
> I have always seen this sort of behaviour - especially in top - on
> various kernels all the way from 4.2 to 4.6
> 
> Regards
> Josh



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