Question

我正在尝试运行基本"Hello, World!" example：

#include <boost/mpi/environment.hpp>
#include <boost/mpi/communicator.hpp>
#include <iostream>
namespace mpi = boost::mpi;

int main()
{
  mpi::environment env;
  mpi::communicator world;
  std::cout << "I am process " << world.rank() << " of " << world.size()
            << "." << std::endl;
  return 0;
}

我尝试了很多变种来运行这个程序：

mpic++ -I /usr/local/include/ test.cpp -o test -lboost_system

也：

mpic++ -I /usr/local/include/boost test.cpp -o test -lboost_system

并使用mpicc和clang++作为替代。每个组合都会出现以下错误：

Undefined symbols for architecture x86_64:
  "boost::mpi::environment::environment(bool)", referenced from:
      _main in test-b0215f.o
  "boost::mpi::environment::~environment()", referenced from:
      _main in test-b0215f.o
  "boost::mpi::communicator::communicator()", referenced from:
      _main in test-b0215f.o
  "boost::mpi::communicator::rank() const", referenced from:
      _main in test-b0215f.o
  "boost::mpi::communicator::size() const", referenced from:
      _main in test-b0215f.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Homebrew说安装了MPICH2和boost1.63.0。我可以通过编译然后运行this program:

来确认mpic++正在运行

   // required MPI include file  
   #include "mpi.h"
   #include <stdio.h>

   int main(int argc, char *argv[]) {
   int  numtasks, rank, len, rc; 
   char hostname[MPI_MAX_PROCESSOR_NAME];

   // initialize MPI  
   MPI_Init(&argc,&argv);

   // get number of tasks 
   MPI_Comm_size(MPI_COMM_WORLD,&numtasks);

   // get my rank  
   MPI_Comm_rank(MPI_COMM_WORLD,&rank);

   // this one is obvious  
   MPI_Get_processor_name(hostname, &len);
   printf ("Number of tasks= %d My rank= %d Running on %s\n", numtasks,rank,hostname);


        // do some work with message passing 


   // done with MPI  
   MPI_Finalize();
   }

产生正确的输出。

我还通过编译并成功运行Boost "Hello, World!"

来验证（至少部分）Boost已安装

//
// timer.cpp
// ~~~~~~~~~
//
// Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//

#include <iostream>
#include <boost/asio.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>

int main()
{
  boost::asio::io_service io;

  boost::asio::deadline_timer t(io, boost::posix_time::seconds(5));
  t.wait();

  std::cout << "Hello, world!" << std::endl;

  return 0;
}

使用：

clang++ -I /usr/local/include/ timer.cpp -o timer -lboost_system

如何运行Boost.MPI示例？

Answer 1

当你从boost获得链接器错误时，你通常忘记链接一个boost库。

还有一个boost_mpi库，所以你应该用

编译

clang++ -I /usr/local/include/ timer.cpp -o timer -lboost_system -lboost_mpi

请注意，您需要一个支持mpi的增强版。

一般考虑http://www.boost.org/doc/libs/1_58_0/doc/html/mpi/getting_started.html
特别是使用自制软件，您可以查看How to build boost with mpi support on homebrew?

Boost.MPI为体系结构x86_64提供未定义的符号

1 个答案: