MPI并行程序设计 —— C 和 fortran 环境搭建 openmpi 示例程序

1.安装环境

wget https://download.open-mpi.org/release/open-mpi/v4.1/openmpi-4.1.6.tar.g
tar zxf openmpi-4.1.6.tar.gz
cd openmpi-4.1.6/
其中 configure 选项 --prefix=/.../ 需要使用绝对路径，例如：
./configure  --prefix=/home/hipper/ex_openmpi/local/ 2>&1 | tee config.out
make -j all 2>&1 | tee make.out
make install 2>&1 | tee install.out

2.配置编译运行环境

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 export PATH=/home/hipper/ex_openmpi/local/bin:$PATH
 export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/hipper/ex_openmpi/local/lib
 
 cd examples
 make
 mpirun -np 7 hello_c

效果图：

3. 练习测试环境

3.1 C语言测试

#include "mpi.h"
#include <stdio.h>
#include <math.h>
void main(argc,argv)
int argc;
char *argv[];
{
    int myid, numprocs;
    int namelen;
    char processor_name[MPI_MAX_PROCESSOR_NAME];
    MPI_Init(&argc,&argv);
    MPI_Comm_rank(MPI_COMM_WORLD,&myid);
    MPI_Comm_size(MPI_COMM_WORLD,&numprocs);
    MPI_Get_processor_name(processor_name,&namelen);
    fprintf(stderr,"Hello World! Process %d of %d on %s\n",
    myid, numprocs, processor_name);
    MPI_Finalize();
}

编译：
gcc hello_ompi.c -I ../local/include/ -L ../local/lib/ -lmpi

执行：
../local/bin/mpirun -np 18 ./a.out

cpu有18个物理核心

效果：

3.2 fortran 语言测试

        program main
        include 'mpif.h'
        character * (MPI_MAX_PROCESSOR_NAME) processor_name
        integer myid, numprocs, namelen, rc,ierr
        call MPI_INIT( ierr )
        call MPI_COMM_RANK( MPI_COMM_WORLD, myid, ierr )
        call MPI_COMM_SIZE( MPI_COMM_WORLD, numprocs, ierr )
        call MPI_GET_PROCESSOR_NAME(processor_name, namelen, ierr)
        write(*,10) myid,numprocs,processor_name
10      FORMAT('Hello World! Process ',I2,' of ',I1,' on ', 20A)
        call MPI_FINALIZE(rc)
        end

gfortran hello_ompi.f -I../local/include/ -L../local/lib/  -lmpi_mpifh -lgfortran

$ ../local/bin/mpirun -np 7 ./a.out