Odd sar output

Darron Froese darron at nonfiction.ca
Wed Feb 28 11:57:15 CST 2007


We saw this here on our 2850 as well - I couldn't find the CPU hog  
since there actually wasn't one, but sar reported that there was.

We finally rebooted and it's been good since then.

On 28-Feb-07, at 10:27 AM, Williams, David A. - DAWilliams wrote:

> Jeff,
> 	I would believe it was a new task or cron job except this
> happened days ago and sar continues to report 0% idle CPU overall but
> mid to high 90s idle on each of the virtual CPUs.  At this point I'm
> flummoxed by the "all" CPU line not relating clearly to each of the
> virtual CPUs.
> 	-David
>
>
> Jeff Howell wrote:
>
> It's probably a cron job like updatedb running. You'll note an  
> increase
> in %system and %iowait indicating significant disk activity.
>
> Hope this helps,
> Jeff
>
> -----Original Message-----
> From: linux-poweredge-bounces at dell.com
> [mailto:linux-poweredge-bounces at dell.com] On Behalf Of Williams, David
> A. - DAWilliams
> Sent: Tuesday, February 27, 2007 12:54 PM
> To: linux-poweredge at dell.com
> Subject: Odd sar output
>
> 	We have a set of dual CPU 2850s in production and we keep an eye
> on sar on each of them.  One, which is not heavily used, has started
> returning really odd things from sar.  Between 14:20 and 14:30 the
> combined idle time dropped from ~ 93% (where it had been since going
> into production) to 0 and it has stayed at 0 for the last several  
> days.
> But the 4 individual virtual CPUs don't show any real change.  Does  
> this
> make sense to anyone?  Has anyone else seen this behavior?
>
> Heading           CPU     %user     %nice   %system   %iowait     % 
> idle
> 14:20:01          all      5.47      0.00      0.80      0.27      
> 93.47
> 14:20:01            0      4.71      0.00      0.72      0.11      
> 94.46
> 14:20:01            1      4.35      0.00      0.79      0.16      
> 94.70
> 14:20:01            2      4.80      0.00      0.57      0.17      
> 94.46
> 14:20:01            3      5.46      0.00      0.74      0.53      
> 93.28
>
> 14:30:01          all     82.62      0.00     14.46      2.92       
> 0.00
> 14:30:01            0      4.62      0.00      0.71      0.22      
> 94.45
> 14:30:01            1      5.88      0.00      0.63      0.00      
> 93.48
> 14:30:01            2      2.04      0.00      0.68      0.11      
> 97.17
> 14:30:01            3      1.81      0.00      0.49      0.18      
> 97.52
>
> 14:40:01          all     84.66      0.00     13.67      1.68       
> 0.00
> 14:40:01            0      3.12      0.00      0.68      0.04      
> 96.16
> 14:40:01            1      5.17      0.00      0.57      0.00      
> 94.26
> 14:40:01            2      3.41      0.00      0.59      0.02      
> 95.98
> 14:40:01            3      3.29      0.00      0.59      0.23      
> 95.90
>
> 	Thanks for any pointers,
> 	-David
> ---------------------------
> David Williams
> Director, Internet Technology
> Web Strategy and Operations
> AARP Services
> (202)434-3672
> dawilliams at aarp.org
> http://www.aarp.org/
>
> ---------------------------
> David Williams
> Director, Internet Technology
> Web Strategy and Operations
> AARP Services
> (202)434-3672
> dawilliams at aarp.org
> http://www.aarp.org/
>
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-- 
darron froese
principal
nonfiction studios inc.
t  403.686.8887
c 403.819.7887
f  403.313.9233
w http://nonfiction.ca/
e  darron at nonfiction.ca


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