On Wed, 17 Apr 2002 maer727@sohu.com wrote:
> My question is, is "Offered object hit ratio" a configured value
> before a simulation test or a meansured value in a simulatuion
> test that we really get from the test?
"Offered object hit ratio" is a value that is determined by
configuration variables and is mostly independent from run-time test
performance. That is, under normal conditions, one can predict offered
hit ratios based on PGL specification alone.
There is no single PGL knob that controls offered hit ratio. Several
settings such as recurrence and content cachability affect it in a
complex way. To avoid complex computations and to be robust, Polygraph
computes offered hit ratio run-time (i.e., you can say that Polygraph
"measures" offered hit ratio). Again, under normal conditions, the
computed value can be accurately predicted by looking at PGL file
alone.
Compare that with what documentation calls "measured" hit ratios that
can only be determined by running the test because they depend on the
performance of the device under test.
Offered ratios is what Polygraph offers to the device under test.
Measured ratios is how the device under test reacts to what it being
offered. Usually, measured hit ratios are lower than offered hit
ratios.
Alex.
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