"hello world" of MPI version

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// file name="hello-mpi.c"#include "mpi.h"#include<stdio.h>#include<math.h>int main(int argc, char *argv[]){       int myid,numprocs;                /* 整型变量myid和numprocs分别用来记录某一个并行执行进程的标识和所有参加计算的进程的个数*/       int namelen;                      /* namelen是实际得到的机器名字的长度*/       char processor_name[MPI_MAX_PROCESSOR_NAME];       /*MPI_MAX_PROCESSOR_NAME宏：某一MPI的具体实现中允许机器名字的最大长度，机器名放在变量processor_name中; */       MPI_Init(&argc, &argv);              /* MPI程序的初始化*/       MPI_Comm_rank(MPI_COMM_WORLD,&myid);       /*得到当前正在运行的进程的标识号，放在myid中*/       MPI_Comm_size(MPI_COMM_WORLD,&numprocs);       /*得到所有参加运算的进程的个数，放在numprocs中;*/       MPI_Get_processor_name(processor_name,&namelen);       /* MPI_Get_processor_name得到本进程运行的机器的名称,结果放在processor_name中，长度放在namelen中;*/       fprintf(stderr,"Hello World!Process %d of %d on %s\n",myid,numprocs,processor_name);       /*MPI程序的结束*/       return 0;}

mpicc hello-mpi.c -o hello-mpi
mpirun -np 5 ./hello-mpi
air:~ wkl$ mpirun -np 5 ./mpi-try
Hello World!Process 0 of 5 on air.local
Hello World!Process 2 of 5 on air.local
Hello World!Process 3 of 5 on air.local
Hello World!Process 1 of 5 on air.local
Hello World!Process 4 of 5 on air.local

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