W dniu 2011-04-15 23:49, Gerhard Adam pisze:
- 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.?
Bear in mind that the utilization in this case simply represents the
probability of the processor being busy when a unit of work becomes ready to
run. So at 80% utilization this represents an 80% probability that a unit
of work will be delayed.
Well, I disagree with such definition. IMHO CPU busy is "pattern" of
NOPs (No OPeration) and "usable" instructions. 1% busy simply means that
99% of cycles were filled with NOP, and only 1% of cycles were other
instructione were executed.
HOWEVER, this depends explicitly on the relative
dispatching priority of the work, so the 80% utilization would only be
relevant to the lowest priority work in the system.
In fact dispatching priority denies you statement above or at least
distorts it.
--
Radoslaw Skorupka
Lodz, Poland
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