W dniu 2011-04-15 22:57, Ward, Mike S pisze:
Hello all, can someone tell me if it's better to use CPU peak or CPU
average to project growth. My way of thinking is if you use peak then
you're sure to show where you need extra horse power. In other words if
you can't process during your peaks what good are the averages.
The answer is quite obvious: IT DEPENDS.
It depends on the following:
- what the peaks are. If the peak is caused by night job, then you
probably accept longer job run. If the peak is casued by on-line
processing then your customers could complain about it.
- what is your business decision/model/philosophy. Maybe your business
have to be cheap and can accept some delays.
- what do you mean by average. I disclose very big secret: CPU is always
100% busy or 0% busy (*). Always - mean in every tact (tick?).
So the shorter period you take for CPU measurement the higher peaks you
will get. If your periods are as short as CPU cycle then your CPU usage
is binary: 100% or 0%.
So, what average would you like to take? 4H, 24H or 15 min.?
(*) Of course the above is some simplification. It does not consider
multiprocessing and ability to execute >1 instructions in one cycle.
It also does not consider the fact by increasing CPU power you can
shorten CPU time but not I/O time.
My €0.02
--
Radoslaw Skorupka
Lodz, Poland
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