在C ++中的并行循环 [英] Parallel Loops in C++

问题描述

我想知道是否有一种简单明了的方法来计算循环，例如for循环和基于循环的C ++并行循环。你将如何执行这样的事情？从斯卡拉我知道地图，过滤器和foreach函数也许它也可能执行这些并行？有没有一种简单的方法来在C ++中实现这一点。
我的主要平台是Linux，但是如果它能够跨平台的话，它将会很好。

解决方案

？您可以查看 OpenMP ，尽管它不是C ++的一部分。但它被编译器广泛支持。

至于基于范围的循环，请参阅使用OpenMP与C ++ 11基于范围的for循环？。

我还在 http://www.open-std.org 上看到了一些文件，表明了将并行结构/算法并入到未来的C ++中的一些努力，但不知道他们目前的状态如何。

UPDATE

只需添加一些示例代码即可：

  template< typename RAIter> 
 void loop_in_parallel（RAIter first，RAIter last）{
 const size_t n = std :: distance（first，last）; 
 
 #pragma omp parallel for 
 for（size_t i = 0; i  auto& elem = *（first + i）; 
 //用elem 
 
 
  

线程数可以在运行时通过 OMP_NUM_THREADS 环境变量设置。

I wonder if there is a light, straight forward way to compute loops such as for and range based for loops in parallel in C++. How would you implement such a thing? From Scala I know the map, filter and foreach functions maybe it would also possible to perform these parallel? Is there an easy way to achieve this in C++. My primary plattform is Linux but it would be nice if it works cross-plattform.

解决方案

What is your platform? You can look at OpenMP, though it's not a part of C++. But it is widely supported by compilers.

As for range-based for loops, see, e.g., Using OpenMP with C++11 range-based for loops?.

I've also seen few documents at http://www.open-std.org that indicate some efforts to incorporate parallel constructs/algorithms into future C++, but don't know what's their current status.

UPDATE

Just adding some exemplary code:

template <typename RAIter>
void loop_in_parallel(RAIter first, RAIter last) {
   const size_t n = std::distance(first, last);

   #pragma omp parallel for
   for (size_t i = 0; i < n; i++) {
       auto& elem = *(first + i);
       // do whatever you want with elem
    }
}

The number of threads can be set at runtime via the OMP_NUM_THREADS environment variable.

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