c++ - OpenMP 刷新与刷新（列表）

Question

在 OpenMP 中，我可以刷新一组指定的变量或整个缓存。

有人知道这个操作的性能吗？仅刷新真正发生变化的变量是否有意义，或者“全部刷新”如此之快，我不应该担心？

我有链接列表，我需要不时刷新我的线程。我应该遍历列表并单独刷新每个元素，还是简单地刷新所有内容？

Answer 1

Given the advice in the OpenMP 3.1 standard:

Use of a flush construct with a list is extremely error prone and users are strongly discouraged from attempting it.

and the following sentence:

An implementation may implement a flush with a list by ignoring the list, and treating it the same as a flush without a list.

I would implement first a solution with pragma omp flush (without any list).

Then, I would really think carefully before trying to optimize this implementation adding a list to flush constructs, as the code won't be performance portable.