RE: 100% CPU

I agree with your water analogy, but an interesting point to consider is a potential benefit of filling the tub slowly. Imagine that one of your requirements is to have a reserve of water on supply so that you could quickly fill a gallon jug on demand without causing the person waiting on the bathtub to perceive that any water had been diverted from filling the tub...

Cary Millsap
Hotsos Enterprises, Ltd.
http://www.hotsos.com

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-----Original Message-----
Sent: Monday, May 19, 2003 11:47 PM
To: Multiple recipients of list ORACLE-L

In defence, it's not the spinning disk but the head flying all over the disk which is likely to fail from over use.

Having said that I'm a big proponent of using available hardware. Hardware is a commodity to be used, not protected and viewed from a distance. If I wear a harddisk out sooner because I've done lots of work with it then that's fine.

Performing an item of work is a bit like filling a bathtub with water in this sense. I can turn the tap on fast and fill it quickly, or just turn it on a little bit and fill it slowly. Which approach uses more water? Neither. Which gets the job done quicker? The first option. What's the benefit of the second option? Nothing really - unless you like the sound of running water.

Note: There is a big difference between 100% utilisation and inefficient use... I hate inefficient use. :-)  

                      "Deshpande, Kirti"

                      <kirti.deshpande_at_v        To:       Multiple
recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>                  
                      erizon.com>               cc:

                      Sent by:                  Subject:  RE: 100% CPU

                      root_at_fatcity.com

 

 

                      20/05/2003 13:31

                      Please respond to

                      ORACLE-L

 

 

Sorry, but I thought the Hard Disks inside the disk arrays spin all the time. So, are those wearing out faster?

• Kirti

-----Original Message-----
Sent: Monday, May 19, 2003 9:27 PM
To: Multiple recipients of list ORACLE-L

>From: Mladen Gogala <mgogala_at_adelphia.net>
>Subject: Re: latch free - library cache
>
>So, what is spending the CPU? Why is a CPU running pedal to the medal a
>problem?
>I thought that CPU hardware was bought in order to run and not to sit
idle?
>The same goes for the memory. There are some people, mostly known as sys
>admins
>that will try telling you that "we need to keep CPU / memory N
>0.000000ree". Well,
>hardware is bought to be utilised. Nobody will stop a CPU for speeding
>(unlike myself and my passion for speeds above 80mph). CPU running at 100
>0s not a problem. An application not performing adequately is a problem.

Someone telling you that the cpu should be at zero percent is just being silly, however running at 100% is not an optimum condition. As one of the evil Sys Admins that you mentioned, I personally prefer my servers to not go
over 30% utilization on average, and prefer spikes to stay under 70%. If your hardware is running full bore all the time, two things will happen 1) Your hardware will wear out faster, especially hard drives, and 2) Your users will notice a slowed response time and complain. I'd say any server that runs over 50% usage on a regular basis is probably a good candidate for
either an upgrade or some load balancing. These figures can vary some with

your budget and business needs but as a generic rule I think many peopel will agree with me in principle. Besides, if you're running at 100% during

normal usage, what happens when a spike comes along like a shift change? Your server is going to lag, and users will be affected.

Chris Berry
compjma_at_hotmail.com
Systems Administrator
JM Associates

"What does it mean when they tell you your budget and it's a negative number?"

_

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