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At 08:10 08/12/1999 , Henrik Krebs wrote:
>message: I think there can be no max. recommended CPU % utilized.
>On a well-tuned system the CPU% should be near 99% (well - in a mixed 
>environment it will not come that close) (and fall to zero when there is 
>nothing to do). Upgrading this mch should result in 99% again, though in a 
>smaller time.
>The reason for upgrading should be the total through-put. If it's too low 
>there are many places to look, mainly Disk busy% and memory pagefaults. 
>The reason for looking at a faster CPU should be that Disk busy% doesn't 
>say 'Buy more arms' and pagefaults doesn't say 'buy more memory'.

Exactly. We have low swap rates and reasonable disk access stats, but we 
are CPU constrained. I have tuned the system to protect interactive 
response. Consequently, I'm looking at batch throughput degradation. Today 
I wrote a program that performs a CPU intensive benchmark test every 30 
seconds and writes a timestamp and elapsed time to a file. I will then 
compare this with the CPU activity % value for the time interval and plot 
the elapsed time against the % busy. Hopefully, this will reveal a 
degradation curve that I can use to demonstrate throughput loss due to lack 
of CPU power. I have an analytic boss, who is also the CFO. I would be 
happy for any other suggestions...
Pete Hall
pbhall@execpc.com
http://www.execpc.com/~pbhall
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