Intertask communication is done by message passing. Design Goals Is complete yet small enough to be easy to learn, use, and capable of being implemented quickly. Provides good performance on IBM's SP series. Becoming available on many machines. Consists of 125 routines.
All parallelism is explicit.
Intertask communication is done by message passing. Design Goals Main goal was portability across many platforms with reasonable performance. Each task can communicate directly with any other task. Bi-directional communication is supported. C 2 - a measure of traffic congestion.