RE: CPU upgrade,how much CPU usage reduction to expect?

Zhu
  In general, a server tends to bottleneck on one of three components --
CPU, memory, or disk. For example, on a system that is bottlenecked on the
disk, upgrading the CPUs may have little effect on overall system
performance. Naturally Oracle production systems with many users tend to be
more complex than that. If you can determine which is your bottleneck, then
you may get an idea of what the difference in performance will be. A good
book that discusses these issues in some detail is Cary Millsap and Jeff
Holt's "Optimizing Oracle Performance". If your Oracle is CPU-licensed,
upgrading the CPU speed is a way to increase performance without affecting
your Oracle license. Just don't promise management that going from 900 to
1200-mhz will automatically make everything run 33% faster.

Dennis Williams
DBA
Lifetouch, Inc.
dwilliams@xxxxxxxxxxxxx 

-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of zhu chao
Sent: Thursday, April 15, 2004 4:13 AM
To: oracle-l@xxxxxxxxxxxxx
Subject: CPU upgrade,how much CPU usage reduction to expect?


Hi, list friends;
    A capacity planning job.
    Currently we have a server running 900MHZ*8 Sun Fire880. Peak CPU usage
is 60%(User+SYS). We will upgrade our CPu from 900MHZ to 1.2G HZ. And we
expect to see some CPU usage reduction, so that we can support more users
and more traffic.
    And we will also replace a 450MHZ*12CPU E4500 with a 900MHZ*8 Fire880.
    According to computer theory and your experience, how much cpu reduction
can we expect?
Thanks;
Zhu Chao

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