On 01/11/2013 09:18 PM US Central Time, Michael Colonno wrote:

The first output below is from cxxcpi; I can also run cpi is it's helpful.

Ah, sorry, I didn't realize you were in fact running one of the test programs distributed in MPICH. Based on the error, some of the nodes are not able to connect to each other based on the hostnames they are publishing. Did you try the solutions listed on the FAQ: http://wiki.mpich.org/mpich/index.php/Frequently_Asked_Questions#Q:_My_MPI_p... -- Pavan -- Pavan Balaji http://www.mcs.anl.gov/~balaji