1756-EWEB,A-B,1756-EWEB
是一个基于共享内存模式的跨平台多线程并行的编程接口。主线程生成一系列的子线程,并将任务映射到子线程进行执行,这些子线程并行执行,由运行时环境将线程分配给不同的物理处理器。默认情况下,各个线程独立执行并行区域的代码。可以使用work-sharingconstructs来划分任务,使每个线程执行其分配部分的代码。通过这种方式,使用OpenMP 可以实现任务并行和数据并行。
图2 任务并行模型
任务并行模式创建一系列独立的线程,每一个线程运行一个任务,线程之间相互独立,如图2所示。 OpenMP使用编译原语session directive和task directive来实现任务分配,每个线程可以独立运行不同的代码区域,同时支持任务的嵌套和递归。一旦创建任务,该任务就可能会在线程池(其大小等于物理线程数目)中空闲的线程上执行。
数据并行也就是数据级并行,对任务中处理的数据进行分块并行执行,如图3所示。C语言中的for循环使用数据并行。
1756-EWEB,A-B,1756-EWEB:李
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