Jeff, Do you need to know if it’s Hydra or if it’s a PMI server? Any PMI server can work with any PMI client. Ideally, they’ll negotiate on the PMI version to use, but a bad client/server might assume a particular version. You can make sure it’s a PMI server by checking for PMI environment variables. Either PMI_FD or PMI_PORT will need to be set. — Pavan On Apr 22, 2014, at 4:48 PM, Jeff Hammond <[email protected]> wrote:

Does anyone know of a good way to detect when the user has built an MPI application with mpicc from implementation A and tries to launch with mpirun/mpiexec from implementation B?

I know that inside of the application, I can use either MPI_Get_library_version or preprocessor info to know what implementation I am using. But can I discover anything about mpirun inside of the application? Is there anything in the environment that I can query to know if my PM is Hydra, for example? If not, can that be added?

This is a relatively common user error that leads to very bad things in some cases so it would be nice to be able to detect it and throw a warning/error.

Thanks,

Jeff

-- Jeff Hammond [email protected]