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тАО10-06-2010 01:06 AM
тАО10-06-2010 01:06 AM
cpu load and utilization correlation
i am trying to understand what cpu utilization and load means and correlation between them. i've read many articles about them. but cannot got exactly anything.
firstly i thought, up to %100 cpu utilization and load avarage 1, they are same. after load avarage 1 they differs because utilization can't get over %100. but i investigate some servers and realised that over %65-70 utilization, cpu load goes over 1.
i also read this artice that explains that %100 cpu utilization is not perfect situation ( we get all from cpu as much as we pay)
http://hoopercharles.wordpress.com/2010/02/05/faulty-quotes-6-cpu-utilization/
what do you think ? is there any correlation according to calculation methods, anything consider ?
thanks. any nice answer will be appreciated with points.
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тАО10-06-2010 02:46 AM
тАО10-06-2010 02:46 AM
Re: cpu load and utilization correlation
The latter just measures how processes are being started and stopped and short lived processes can really make it large.
Of course, you need to really measure more than CPU, glance can measure, CPU, disk I/O, networking and memory usage, and much more.
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тАО10-06-2010 03:32 AM
тАО10-06-2010 03:32 AM
Re: cpu load and utilization correlation
This page appears broken I am afraid.
I am agree with Dennis.As addition:
When it comes to CPU Load; CPU queue metrics, run queue and the load average together make sense of the CPU load;
-The run queue is the current instantaneous number of processes waiting to use the CPU
-The load average, shows 1-minute, 5-minute, and 15-minute averages of CPU use.
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тАО10-06-2010 03:45 AM
тАО10-06-2010 03:45 AM
Re: cpu load and utilization correlation
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тАО10-06-2010 04:05 AM
тАО10-06-2010 04:05 AM
Re: cpu load and utilization correlation
Kenan, it is working now. But it did not work by the time of my post.
By the way, I would like to add about one word glance quoted from HP-UX Performance & Tuning book; Glance is the best tool for obtaining CPU usage information because it uses more accurate data collected by the MI.(measurement process, midaemon)
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тАО10-06-2010 10:31 PM
тАО10-06-2010 10:31 PM
Re: cpu load and utilization correlation
@Dennis, can you explain a bit more detail ?
> The latter just measures how processes are being started and stopped and short lived processes can really make it large.
in what circumstances load and utilization over a time can be different ?
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тАО10-07-2010 01:22 AM
тАО10-07-2010 01:22 AM
Re: cpu load and utilization correlation
Suppose you have a lot of short term processes or processes that are continually waiting for I/O. This will cause the load average to go up even if the CPU utilization isn't high.
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тАО10-07-2010 11:28 PM
тАО10-07-2010 11:28 PM
Re: cpu load and utilization correlation
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тАО10-08-2010 12:29 AM
тАО10-08-2010 12:29 AM
Re: cpu load and utilization correlation
Run Queue:A process must be on a queue of runnable processes before the scheduler can choose it to run.
http://docs.hp.com/en/5965-4642/ch01s14.html
Sleeping a process:A process may have to wait for a resource or event that is currently not available. It makes a sleep system call that puts the process on a queue of sleeping processes.
So run queue , process did not go to scheduler to run yet, mean you cannot see it in the list (with command top for example)
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тАО10-08-2010 01:58 AM
тАО10-08-2010 01:58 AM
Re: cpu load and utilization correlation
I was thinking it quickly finished the I/O and then went back into the run queue.