Hi Fa-Gung, This looks like your network is not correctly configured. The problem is likely to be the /etc/hosts file. Also, I would suggest you to try the latest stable version of MPICH (v3.2). The MPICH-2 v1.4.1 is a very old version. Yanfei Guo Assistant Computer Scientist MCS Division, ANL On 10/12/17, 10:52 PM, "Fa-Gung Fan" <[email protected]> wrote: Hi, I installed mpich2-1.4.1p1 on CentOS 6.9 following the README instruction. Configure, make, and make install steps went fine. But, when running CPI example on local machine, I got: $ pwd /home/ffan/Downloads/mpich2-1.4.1p1 $ mpiexec -n 2 ./examples/cpi ssh: Could not resolve hostname CentOS-6.localdomain: Name or service not known What could have been wrong? Thank you very much for your help. Fa-Gung Fan _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss