Hi Matthias, probably I'm doing something really stupid, but it seems the problem is somehow related to shared_ptr. This code reproduces the "MPI message truncated error": #include <boost/mpi/environment.hpp> #include <boost/mpi/communicator.hpp> #include <boost/serialization/assume_abstract.hpp> #include <boost/serialization/export.hpp> #include <boost/serialization/base_object.hpp> #include <boost/serialization/shared_ptr.hpp> #include <boost/serialization/tracking.hpp> #include <boost/serialization/vector.hpp> #include <boost/shared_ptr.hpp> #include <vector> struct base { virtual void do_something() const = 0; template <class Archive> void serialize(Archive &ar, const unsigned int) { ar & values; } std::vector<double> values; virtual ~base() {} }; BOOST_SERIALIZATION_ASSUME_ABSTRACT(base); struct derived: public base { void do_something() const {}; template <class Archive> void serialize(Archive &ar, const unsigned int) { ar & boost::serialization::base_object<base>(*this); } }; BOOST_CLASS_EXPORT(derived); struct container { template <class Archive> void serialize(Archive &ar, const unsigned int) { ar & ptr; } boost::shared_ptr<base> ptr; }; int main() { boost::mpi::environment env; boost::mpi::communicator world; if (world.rank() == 0) { boost::shared_ptr<container> c(new container()); world.send(1,0,c); world.recv(1,0,c); } else { boost::shared_ptr<container> c(new container()); world.recv(0,0,c); world.send(0,0,c); } return 0; } The error happens when rank 1 is receiving the object: terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::mpi::exception>
' what(): MPI_Unpack: MPI_ERR_TRUNCATE: message truncated
Thanks, Francesco.