MPICH2 gethostbyname failed

Question

I don\'t understand the error message. I am trying to do is to run a MPICH2 application after I installed mpich2 version 1.4 or 1.5 to /opt/mpich2 (both version fai

Answer 1

What worked for me was the following:

Make sure your hostname is the same for 1 and 2 below:

1. terminal hostname
2. "/etc/hosts" hostname

So if you type cat /etc/hosts in terminal it should look like:

// 127.0.0.1       my_hostname

My hostname was not the same for 1 and 2 for me. Once I changed them to match then my mpi program would execute.

To change your terminal hostname type the following: sudo scutil --set HostName my_new_host_name

To change your /etc/hosts hostname type the following: sudo nano /etc/hosts

and then add the line

127.0.0.1       my_new_hostname