2

我使用 openmpi 和 linux mint,考虑以下示例:

#include <boost/mpi.hpp>
#include <iostream>
#include <string>
#include <boost/serialization/string.hpp>

namespace mpi = boost::mpi;
using namespace std;

int main()
{
    mpi::environment env;
    mpi::communicator world;

    if (world.rank() == 0)
    {
        world.send(1, 0, std::string("3664010"));
        while (1)
        {
             world.send(1, 0, std::string("3664012"));
             sleep(1);
        }
     }
     else
     {
        std::string msg;
        string dst;
        bool first = true;

        while (1)
        {
            world.recv(0, 0, msg);
            if (first) {dst = msg;first = false;}
            std::cout << "slave received=" << dst << " msg=" << msg << std::endl;
        }
     }

    return 0;
}

编译:mpic++ -std=c++0x test.cc -lboost_serialization -lboost_mpi
运行:mpirun -np 2 ./a.out
输出:从属接收=3664010 msg=3664010
从属接收=3664012 msg=3664012
从属接收=3664012 msg= 3664012

只有当所有消息的长度相等时,才会重现错误。例如,如果第二条消息是“3664012andmore”,一切正常:
slave received=3664010 msg=3664010
slave received=3664010 msg=3664012andmore
slave received=3664010 msg=3664012andmore
slave received=3664010 msg=3664012andmore

看起来 dst 和 msg 使用相同的内存缓冲区。只有当字符串长度不同时,它们才会开始使用不同的内存缓冲区。我使用以下解决方法(msg = string()) 告诉编译器 msg 已更改:

std::cout << "slave received=" << dst << " msg=" << msg << std::endl;
msg = string();

它工作正常。有没有更好的解决方案?谢谢你。

4

1 回答 1

0

通过使用没有字符串牛的 gcc c++11 解决了问题

于 2015-12-01T15:39:51.437 回答