The LogP machine is a model for parallel computation.[1] 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 , , and .
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 , and are measured in multiples of processor cycles.
Culler, David; Karp, Richard; Patterson, David; Sahay, Abhijit; Schauser, Klaus Erik; Santos, Eunice; Subramonian, Ramesh; Von Eicken, Thorsten (July 1993), "LogP: Towards a realistic model of parallel computation", ACM SIGPLAN Notices, 28 (7): 1–12, CiteSeerX 10.1.1.319.7827, doi:10.1145/173284.155333