I'm using call to MPI_Comm_spawn_multiple in a quite big application. I've seen a deadlock occurred in a very strange situation. If I'm running my application on my Ubuntu 12.10 with OpenMPI 1.6.3 there is absolutely no problem. 

On my Mac OS X 10.8.2 with also OpenMPI 1.6.3, I'm experiencing a dead lock on an intrecommunicator resulting from the MPI_Comm_spawn_multiple only if my ethernet interface is enable. If I disable it, the deadlock is gone. 

Anyone has an idea of what is happening ? I joined the output of ompi_info on both OS X and Linux. 



Valentin Clement - Student trainee at RIKEN AICS
Programming Environment Research Team
Master thesis project
POP-C++ on the K Computer 
Project homepage: https://forge.tic.eia-fr.ch/projects/poponk
Project board: https://forge.tic.eia-fr.ch/projects/poponk/wiki/Wiki