如何在mpi中发送字符串向量? [英] how to send a vector of string in mpi?

问题描述

我想在MPI中发送一个字符串向量，但是我不知道如何使用MPI_Send和MPI_receiev.例如，如果我要发送long的向量，则将使用以下代码:

I want to send a vector of string in MPI,but I don't know how should I use the MPI_Send and MPI_receiev. for example if I want to send a vector of long I will use this code:

vector<double> local_data(n);

 MPI_Send(&local_data[0], n, MPI_DOUBLE, 0, 0, MPI_COMM_WORLD);

但是如果我想发送这样的字符串向量

but if I want to send a vector of string like this

vector<std::string> local_data(n);

我不知道应该在MPI_send中使用什么作为size of buffer和variable的类型， 或MPI_recive.有什么解决办法吗?

I don't know what should I use as the size of buffer and the type of variable in MPI_send, or MPI_recive. is there any solution for that?

推荐答案

要在MPI中发送字符串，必须首先将其转换为C样式char数组.没有MPI_STRING类型(除非您使用一些非标准扩展名).转换为c_str时，应该能够获取字符串的大小并将其用作MPI_SEND或MPI_RECV的大小输入.

When you want to send strings in MPI, you have to convert them to C style char arrays first. There isn't an MPI_STRING type (unless you're using some non-standard extensions). When you convert to the c_str, you should be able to get the size of the string and use that as the size input for the MPI_SEND or MPI_RECV.

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