CPU_COUNT when more than 1 instance per server

Hi,
I wonder if there is any drawback when we got few instances on the same server from cpu_count point of view.
This parameter is derived by all instances like they are alone so all control structures are allocated independetly but there is more
resource needed when many instances in place.
Could this be potencial bottleneck ?
Regards.
Greg

mseberg wrote:
The last time I checked the guideline the maximum CPU busy rate should be 90%
Here's more info:
http://www.dba-oracle.com/t_high_cpu.htm
The advice on that page is not very good - the most important point is the quote from IBM, which highlights the fact that there is a difference between single-user and multi-user systems:
<blockquote>
+"This holds true in the case of a single-user system with no need to share the CPU. Generally, if us + sy time is below 90 percent, a single-user system is not considered CPU constrained. However, if us + sy time on a multiuser system exceeds 80 percent, the processes may spend time waiting in the run queue. Response time and throughput might suffer"+
</blockquote>
In fact, it's a bit silly to give a single figure for the point where you should be concerned about CPU utilisation. The best reference for discussion is Cary Millsap's book "Optimizing Oracle Performance" which discusses the impact of concurrency on queueing. Instability in performance varies with the number of CPU combined with the percentage utilisation, and the break point sets in around the following levels:
<blockquote>
4 CPUs: 67%
8 CPUs: 75%
16 CPUs: 87%
</blockquote>
Your observation, thought that the OP should not mess with the cpu_count parameter is sound. Perhaps the only parameters that he should worry about are the parallal_max_servers and processes parameters to ensure that no one instance is allowed to run up more processes than the machine can handle.
(I find the best sources of information that bridge the gap between Oracle and the hardware are Kevin Closson's blog, James Morle's website - and a site from someone at Sun whose name I can't remember at the moment.)
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
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CPU_COUNT when more than 1 instance per server

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