发送一个c ++ std :: vector< bool>通过MPI [英] Send a c++ std::vector<bool> via mpi

问题描述

我知道std::vector<bool> 的存储不一定是布尔.

如果我要发送存储在std::vector<int>中的接收int数据，则可以使用MPI_Send(vect.data(),num_of_ints,MPI_INT,dest_rk,tag,comm).

If I want to send receive int data stored in a std::vector<int>, I would use MPI_Send(vect.data(),num_of_ints,MPI_INT,dest_rk,tag,comm).

我应该如何使用MPI_Send发送std::vector<bool>?特别是:

How should I use MPI_Send to send a std::vector<bool> ? In particular :

• 我可以/应该使用vect.data()作为缓冲区的指针吗?
• 我应该提供哪种MPI类型?不知何故，我觉得MPI_CXX_BOOL不适用(请参阅此 question )
• 我应该给多少个元素? (与上一点有关)

• Can / should I use vect.data() as the pointer to buffer ?
• What MPI type should I give ? Somehow, I feel like MPI_CXX_BOOL does not apply (see this question)
• What number of elements should I give ? (related to the previous point)

推荐答案

std::vector<bool> 专业化没有data()成员函数.标准未指定基础存储方案 :

std::vector<bool> specialization does not have the data() member function. The underlying storage scheme is not specified by the standard:

不要求将数据存储为bool值的连续分配.建议改用空间优化的位表示形式.

There is no requirement that the data be stored as a contiguous allocation of bool values. A space-optimized representation of bits is recommended instead.

发送std::vector<bool>的唯一合理选择是将其复制到char(或类似std::int8_t的类似类型)的向量中，然后发送该向量.更好的选择可能是从一开始就避免在代码中使用std::vector<bool>.

The only reasonable option to send std::vector<bool> is to copy it into a vector of char (or some similar type like std::int8_t), and then send that vector. A better option might be to avoid std::vector<bool> in your code from the very beginning.

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