RE: measuring the extra CPU needed
Date: Tue, 22 Jul 2014 11:22:50 +0100
Message-ID: <EC65ECF8123FEE4D8FC5B212637C3040016672D3F08B_at_EXCH1.morrisonsplc.co.uk>
As you are already planning to increase CPU capacity that implies that you have already done the analysis that identifies what you are short of.
TBH I am guessing that most people do not do exact measurements as, unless you can replicate the exact volume, data and way it is used it will be difficult to do that. Therefore a simple theory might be – we have 4 CPUS and are hitting limits regularly for significant periods of time (significant is very application specific here – it may be seconds or an hour depending on the importance of the system and the impact it has).
So my example we might think we need 6 CPU to maintain current and we know that growth will increase by 25% so that looks like 8 to me – as most sites I have been at seem to always use even numbers of CPUs.
John
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Orlando L
Sent: 16 July 2014 19:41
To: oracle-l_at_freelists.org
Subject: measuring the extra CPU needed
All,
We have an existing system on 10.2 on AIX. We are planning to increase the CPU capacity because we seem to be hitting the limits there and also a merger. We will be adding more population to this application due to the merger, about 25% more. Assuming that the applications are tuned enough, how do I go about measuring the increased CPU load needed for this new population.
Thanks,
Orlando.
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