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Home -> Community -> Mailing Lists -> Oracle-L -> RE: 100% CPU
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?
-----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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