MPI

1. Environment:

          Node1: will_00 (hostname); cpu=1;192.168.122.50; 

          Node2: will_01 (hostname); cpu=1;192.168.122.51;

     ###双机安装相同的mpich2环境: mpich2, mpich2-devel;###

     ###双机创建相同的用户: 0092 (user); 123 (passwd) ###

2. 创建ssh信任

     1) vi /etc/hosts

          (will_00)

               127.0.0.1   localhost will_00

               192.168.122.50  will_01

               192.168.122.51  will_00

          (will_01)

               127.0.0.1   localhost will_01

               192.168.122.50  will_01

               192.168.122.51  will_00

     2)

     (will_00)

          [0092@will_00 ~]:$ ssh-keygen -t rsa

          [0092@will_00 ~]:$

             Generating public/private rsa key pair.Enter file in which to save the key (/home/0092/.ssh/id_rsa): [默认值]

             Enter passphrase (empty for no passphrase): [默认值,空字符]

             Enter same passphrase again: [默认值,空字符]

             Your identification has been saved in /home/0092/.ssh/id_rsa.

             Your public key has been saved in /home/0092/.ssh/id_rsa.pub.

             The key fingerprint is:67:ae:bd:ef:7b:3f:58:0e:a6:dc:35:68:56:1c:c5:37

          [0092@will_00 ~]:$ ls -a

              . ../   .ssh/

          [0092@will_00 ~]:$ cd .ssh/

          [0092@will_00 ~]:$ cp id_rsa.pub authorized_keys

          [0092@will_00 ~]:$ cd ..

          [0092@will_00 ~]:$ ssh will_01

           ………………………………………………………………………………(yes/no): yes

     (will_01)

          [0092@will_01 ~]:$ ssh-keygen -t rsa      //生成.ssh/

           ………………………………………………………………

          [0092@will_01 ~]:$ scp will_00:/home/0092/.ssh/*   /home/0092/.ssh 

          [0092@will_01 ~]:$ ssh will_00

           ………………………………………………………………………………(yes/no): yes

          ###确认两台机器的信任连接已建立: 在每个节点试验执行###

          [0092@will_01 ~]:$ssh will_00

          [0092@will_00 ~]:$ssh will_01

          ###如有提示，输入yes，确保双方无需输入密码即能登陆###

3. 设置Hydra

    (will_00)

          [0092@will_00 ~]:$ sudo mkdir /etc/hydra

          [0092@will_00 ~]:$ sudo vi /etc/hydra/hosts

                   ##文件结构如下:

                   ## node:cpu_num

                    will_00:1

                    will_01:1

          [0092@will_00 ~]:$ vi ~/.bashrc

                    export HYDRA_HOST_FILE=/etc/hydra/hosts

     (will_01)

          ## do the same thing as above in will_01 ##

4. 测试MPI环境

          [0092@will_00 ~]:$ vim test.c

#include

#include

#include

int main(){

int my_rank;

int comm_sz;

MPI_Init(NULL,NULL);

MPI_Comm_rank(MPI_COMM_WORLD,&my_rank);

MPI_Comm_rank(MPI_COMM_WORLD,&comm_sz);

printf("my_rank:%d,comm_sz:%d\n",my_rank,comm_sz);

MPI_Finalize();

return 0;

}

          [0092@will_00 ~]:$ mpicc test.c -o xxx

          [0092@will_00 ~]:$ mpiexec -n 1 ./xxx

          [0092@will_00 ~]:$ mpiexec -n 2 ./xxx