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List:       freebsd-smp
Subject:    Re: Per processor load?
From:       Aaron Grosky <agrosky () wgate ! com>
Date:       1998-08-20 14:49:18
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Hello Lars, Terry, ...

I spent many years working with Cray's SMP UNICOS.

On Wed, 19 Aug 1998, Lars [iso-8859-1] Köller wrote:
> Hello Terry!
> 
> First of all thanks for the large answer!
> 
> In reply to Terry Lambert who wrote:
>  
>>> ...
>>> System: share                              Tue Aug 18 07:30:58 1998
>>> Load averages: 2.42, 2.29, 2.28
>>> 280 processes: 273 sleeping, 5 running, 2 zombies
>>> Cpu states:
>>> CPU   LOAD   USER   NICE    SYS   IDLE  BLOCK  SWAIT   INTR   SSYS
>>>  0    2.62   0.4%  97.6%   2.0%   0.0%   0.0%   0.0%   0.0%   0.0%
>>>  1    2.22   0.8%  97.0%   2.2%   0.0%   0.0%   0.0%   0.0%   0.0%
>>> ---   ----  -----  -----  -----  -----  -----  -----  -----  -----
>>> avg   2.42   0.6%  97.2%   2.2%   0.0%   0.0%   0.0%   0.0%   0.0%
> 
> Sorry, I forgot to mention this top was running on HPUX 10.20.
> 
>> This basically implies a scheduler artifact; each CPU must have its
>> own ready-to-run queue for you to get this statistic; ...
A process which is not multi-threaded can only be runnable on one processor
at a time.  Therefore, given a mix of simple processes (not threaded) and
threaded processes running on only one processor: the above example shows,
as one possibility, processor 0 running a simple process for the previous
load interval while processor 1 ran a simple process 60% of that time and a
multi-threaded process 40% of the time.

> ...
> 
> Thanks again and best wishes
> 
> Lars

Aaron

Aaron Grosky			agrosky@wgate.com
	   WorldGate Communications
	   "Internet TV Over Cable"
3220 Tillman Drive		215-633-5125
Bensalem, PA 19020		215-633-9590 (FAX)


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