Parallel Programming Languages and Environments

Parallel programming paradigms and environments differ in many aspects. These variations arise from at least four factors  

How parallelism is expressed implicitly, as in an automatically parallelized DO loop, or explicitly, as in a UNIX fork-and-join model.- 39 

How parallel execution is coordinated by compiler analysis of dependencies in a parallel DO loop, by use of message passing, or through shared data and mutual exclusion. 

How work is distributed whether data are distributed between processors (data-driven) or whether tasks are distributed between processors (task-driven). 

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