Type level

boost::mpi::threading::level — specify the supported threading level.

Synopsis

// In header: <boost/mpi/environment.hpp>


enum level { single = = MPI_THREAD_SINGLE, funneled = = MPI_THREAD_FUNNELED, 
             serialized = = MPI_THREAD_SERIALIZED, 
             multiple = = MPI_THREAD_MULTIPLE };

Description

Based on MPI 2 standard/8.7.3

single

Only one thread will execute.

funneled

Only 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).

serialized

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'').

multiple

Multiple thread may do MPI calls.

Multiple threads may call MPI, with no restrictions.