Question

我想用c ++方式使用mpi，所以我有来自mpich2的cxxpi.cxx代码示例：

#include "mpi.h"
#include <iostream>
#include <math.h>

using namespace std;

double f(double);

double f(double a) {
    return (4.0 / (1.0 + a*a));
}

int main(int argc, char **argv) {
    int n, myid, numprocs, i;
    double PI25DT = 3.141592653589793238462643;
    double mypi, pi, h, sum, x;
    double startwtime = 0.0, endwtime;
    int  namelen;
    char processor_name[MPI_MAX_PROCESSOR_NAME];

    MPI::Init(argc, argv);
    numprocs = MPI::COMM_WORLD.Get_size();
    myid = MPI::COMM_WORLD.Get_rank();
    MPI::Get_processor_name(processor_name, namelen);

    cout << "Process " << myid << " of " << numprocs << " is on " <<
        processor_name << endl;

    n = 10000;          /* default # of rectangles */
    if (myid == 0)
        startwtime = MPI::Wtime();

    MPI::COMM_WORLD.Bcast(&n, 1, MPI_INT, 0);

    h = 1.0 / (double) n;
    sum = 0.0;
    /* A slightly better approach starts from large i and works back */
    for (i = myid + 1; i <= n; i += numprocs) {
        x = h * ((double) i - 0.5);
        sum += f(x);
    }
    mypi = h * sum;

    MPI::COMM_WORLD.Reduce(&mypi, &pi, 1, MPI_DOUBLE, MPI_SUM, 0);

    if (myid == 0) {
        endwtime = MPI::Wtime();
        cout << "pi is approximately " << pi << " Error is " <<
            fabs(pi - PI25DT) << endl;
        cout << "wall clock time = " << endwtime - startwtime << endl;
    }

    MPI::Finalize();
    return 0;
}

我设置了VS2013项目的属性：

属性＆gt; VC ++目录＆gt;包括目录＆gt; （添加路径）＆＃34; C：\ Program Files \ MPICH2 \ include＆＃34;
属性＆gt; VC ++目录＆gt;图书馆目录＆gt; （添加路径） ＆＃34; C：\ Program Files \ MPICH2 \ lib＆＃34;
属性＆gt;链接器＆gt;输入＆gt;附加依赖性＆gt; （添加了lib）＆＃34; mpi.lib＆＃34;
属性＆gt;平台＆gt; （已设置为）有效（x64）

我有未解决的引用链接器错误。具有相同属性的cpi.c代码编译没有问题。我认为问题出在链接器需要的库中，但我试图找到它们的组合，但它没有解决问题。 MPICH2有这样的库：cxx.lib，fmpich2.lib，fmpich2g.lib，irlog2rlog.lib，mpe.lib，mpi.lib，rlog.lib，TraceInput.lib。如何使程序正常工作？

Answer 1

您需要再添加一个依赖项--cxx.lib

该库包含c ++的所有必要绑定。

您可以查看MPICH2 / examples / cxxpi.vcproj以发现需要链接此库。

mpich2 visual studio 2013链接器错误

1 个答案: