Re: [Boost-users] [mpi/serialization] Potential bug or just library misunderstanding?

On Sep 30, 2011, at 5:18 PM, Tim Jacobs wrote:

I'm not sure why the following test-class produces this error: "MPI_Recv: MPI_ERR_TRUNCATE: message truncated"

If the std::map has only a single element (ie I remove one of the test[].push_back() lines) the error does not occur. Can someone verify that this is indeed a bug and not just novice misuse of the library?

Thanks, Tim

#include #include #include #include

int main( int argc, char * argv [] ) { boost::mpi::environment env(argc, argv); boost::mpi::communicator world;

if(world.rank()==0){ std::mapstd::string > test; test[1].push_back("FOO"); test[50].push_back("BAR"); world.send(1, 1, boost::mpi::skeleton(test)); world.send(1, 1, boost::mpi::get_content(test)); std::cout << "sent" << std::endl; } else{ std::mapstd::string > test; world.recv(0,1,boost::mpi::skeleton(test)); world.recv(0,1,boost::mpi::get_content(test)); } }

The problem is that a std::map cannot be sent using the skeleton&content approach, since the keys need to be known to build a map. Matthias