MPI Learning notes--MPI Environment configuration

The first step is to install the SSH server and client under Ubuntu
Open new, type OpenSSH in all, select Openssh-client and openssh-server tags to install the application, or directly execute
$ sudo apt-get install openssh-client openssh-server


Second Step installation Mpich
Open the new stand, type MPI in all, select Mpi-bin, Mpi-doc, libmpich1.0-dev tag installation application


$ sudo apt-get install mpi-bin mpi-doc Libmpich1.0-dev


Third Step test Installation
$ Touch hello.c
Type the following to HELLO.C
1 #include <mpi.h>
2 #include <stdio.h>
3 int main (int argc, char *argv[])
4 {
5 int npes, Myrank;
6 Mpi_init (&AMP;ARGC, &AMP;ARGV);
7 mpi_comm_size (Mpi_comm_world, &npes);
8 Mpi_comm_rank (Mpi_comm_world, &myrank);
9 printf ("From process%d of%d, Hello world!\n", Myrank, NPEs);
Ten mpi_finalize ();
11}
$ mpicc-o Hello hello.c
$ MPIRUN-NP 2 Hello #应该会输出两次Hello, the middle may require a password, if you do not want to enter the password, look at the fourth step


Fourth step to remove the SSH password step
$ ssh-keygen-t DSA #中间提示输入密码, direct return, will be generated in the file ~/.ssh/id_dsa.pub
$ cat Id_dsa.pub >> Authorized_keys
$ MPIRUN-NP 2 Hello #应该没有密码输入提示了