RE: 100% CPU

Excuse me if any of the remarks is because of lack of experience, but doesn't 100% CPU utilization mean that the box is not at all scalable and needs to be changed even if the load changes by a small percentage?

Won't it be wise to have a box which can work(efficiently) even if the load increases by lets say 30-40%.

Regards
Naveen

-----Original Message-----
Sent: Tuesday, May 20, 2003 8:32 PM
To: Multiple recipients of list ORACLE-L

well said...:)

-----Original Message-----
Sent: Tuesday, May 20, 2003 3:32 PM
To: Multiple recipients of list ORACLE-L

The analogy I heard was a hospital with empty hospital beds. What good are the beds if they aren't being used? What good is the CPU if it isn't being used? Of course you want to keep a few beds available for emergencies.

Henry

-----Original Message-----
Kirti
Sent: Monday, May 19, 2003 11:32 PM
To: Multiple recipients of list 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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