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RE: 100% CPU

From: Deshpande, Kirti <>
Date: Mon, 19 May 2003 19:31:43 -0800
Message-ID: <>

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

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

>From: Mladen Gogala <>
>Subject: Re: latch free - library cache
>So, what is spending the CPU? Why is a CPU running pedal to the medal a
>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
>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
Systems Administrator
JM Associates

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


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Author: Deshpande, Kirti

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Received on Mon May 19 2003 - 22:31:43 CDT

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