[hobbit] CPU Utilization, Less Averaging

[Hubbard, Greg L]

Why do users think that the load average graph (which measures the
average length of the CPU run queue) should correlate with the CPU
utilization (busy time divided by available time)?  The values in each
graph are calculated very differently.
 
Just wondering...
 
GLH


________________________________

	From: James Wade [mailto:jkwade at futurefrontiers.com] 
	Sent: Friday, February 16, 2007 12:31 PM
	To: hobbit at hswn.dk
	Subject: [hobbit] CPU Utilization, Less Averaging
	
	

	Can I set the vmstat collection to average less

	and collect more data points? The users here

	don't agree with the CPU Utilization Graph,

	they don't like the way the Average doesn't

	fluctuate much.

	 

	Basically, they are comparing the Load graph

	with the Utilization Graph and want to see the

	graph correlate more with the Load Graph.

	 

	My understanding is that the Utilization Graph

	is using a 5 minute cpu idle average from vmstat.

	 

	Can I change vmstat to take a 15 second average

	as an example, and do more counts so more datapoints 

	are graphed?

	 

	Any suggestions would be appreciated.

	 

	Thanks...James

	 

	 

	 

	 

	 

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