[hobbit] CPU Utilization, Less Averaging

[James Wade]

True, and I've checked, by looking at what the cpu utilization

should be compared to the load average. Everything looks fine.

 

To be honest, it's user perception. They want to see a

graph that doesn't average but shows the peaks and troughs.

There is another tool here that does cpu utilization, and it

doesn't average and shows more peaks and troughs.

 

So, I just want to drop the averaging so that it takes more samples,

and less averaging. 

 

As an example, they are looking at load doubling,

but the cpu utilization graph shows no change. However, because

the box is a mutli-cpu box, the load doubling in this case only

means an average increase in utilization by 2%. However, if the

load goes down within 5 minutes, the 2% isn't registered, so

the graph gives a constant cpu average. 

 

What I have seen is the Utilization may go up by 10% or 15%

for only a few seconds, then drop down, (As seen by TOP)

This normally occurs when a large job hits. Because the cpu 

utilization is an average on a 5 minute basis, there is not 

normally a change in the graph.

 

I figure if I drop the sample down, I'll get more peaks and troughs

and make them happy. How can I do this in Hobbit?

 

James

 

 

  _____  

From: Hubbard, Greg L [mailto:greg.hubbard at eds.com] 
Sent: Friday, February 16, 2007 1:30 PM
To: hobbit at hswn.dk
Subject: RE: [hobbit] CPU Utilization, Less Averaging

 

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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