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boost::mpi::threading::level — specify the supported threading level.
// In header: <boost/mpi/environment.hpp> enum single, multiple };
Based on MPI 2 standard/8.7.3
singleOnly one thread will execute.
multipleOnly main thread will do MPI calls.
The process may be multi-threaded, but only the main thread will make MPI calls (all MPI calls are ``funneled'' to the main thread). */ funneled, /** Only one thread at the time do MPI calls.
The process may be multi-threaded, and multiple threads may make MPI calls, but only one at a time: MPI calls are not made concurrently from two distinct threads (all MPI calls are ``serialized''). */ serialized, /** Multiple thread may do MPI calls.
Multiple threads may call MPI, with no restrictions.