Log(P) Communication Parameters
Much more recent, used primarily for benchmarking asynchronous communication layers, like Active Messages.
Distinguishes time that processor is involved in message transmission from the time spent in the network.
Measurement is a bit more difficult, done by analysis of data from a loop of requests followed by computation for a known interval.
Parameters are derived from asymptotics.
See http://www.cs.berkeley.edu/~rmartin/micropaper.ps