LogP machine

The LogP machine is a model for parallel computation.
It aims at being more practical than the PRAM model while still allowing for easy analysis of computation.
The name is not related to the mathematical logarithmic function: Instead, the machine is described by the four parameters formula_1, formula_2, formula_3 and formula_4.
The LogP machine consists of arbitrarily many processing units with distributed memory.
The processing units are connected through an abstract communication medium which allows point-to-point communication. This model is pair-wise synchronous and overall asynchronous.
The machine is described by the four parameters:
Each local operation on each machine takes the same time ('unit time'). This time is called a processor cycle. The units of the parameters formula_1, formula_2 and formula_3 are measured in multiples of processor cycles.