Parallelism is introduced by running the main thread scheduling child threads for each task so that the tasks execute concurrently while each thread execute the task synchronously.
并行性是通过运行主线程为每一个任务调度执行的子线程而实现的，这样任务就会并发执行，而每一个线程是同步执行任务的。
A job that is running with one degree of parallelism is a sequential job.
平行度为1的作业是序列作业。
From the point of view of program structure and program running, the formal definitions about SIMD and MIMD parallelism are presented clearly, which are criteria of extracting program heterogeneity.
从程序结构和程序运行的观点出发，清楚地给出了SIMD, MIMD并行性的形式定义，它是提取程序异构性的依据。
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