Boost.MPI --- boost::mpi::group class
Hi, It's my first time using Boost and is amazing. I'm trying to understand why this simple example bellow don't works as expected: #include <iostream> #include <boost/mpi.hpp> using namespace std; namespace mpi = boost::mpi; int main ( int argc, char *argv[] ) { mpi::environment env( argc, argv ); mpi::communicator world; mpi::group subgroup( MPI_Group( world.group() ), true ); cout << "I'm process " << world.rank() << endl; cout << "But in subgroup i'm process " << subgroup.rank() << endl; cout << "And the subgroup size is... " << subgroup.size() << endl; return 0; } // ---------- end of function main ---------- *1. Why every process has rank 1 in subgroup? I trying to figure out what happens, but without success.* The mpi::boost::group class has no copy constructor explicitly defined. That is true for many other classes in Boost.MPI... *2. It's safe to use the copy constructor generated by the compiler as follows?* * * mpi::group subgroup = world.group().exclude( discardedRanks.begin(), discardedRanks.end() ); Thanks in advance for any help. Regards, Júlio.
Oh my god, it's not implemented, right? boost::mpi::group(const MPI_Group& in_group, bool adopt); I will have to use OpenMPI C++ terrible bindings. :-( Júlio. ---------- Forwarded message ---------- From: Júlio Hoffimann <julio.hoffimann@gmail.com> Date: 2011/2/7 Subject: Boost.MPI --- boost::mpi::group class To: boost-users@lists.boost.org Hi, It's my first time using Boost and is amazing. I'm trying to understand why this simple example bellow don't works as expected: #include <iostream> #include <boost/mpi.hpp> using namespace std; namespace mpi = boost::mpi; int main ( int argc, char *argv[] ) { mpi::environment env( argc, argv ); mpi::communicator world; mpi::group subgroup( MPI_Group( world.group() ), true ); cout << "I'm process " << world.rank() << endl; cout << "But in subgroup i'm process " << subgroup.rank() << endl; cout << "And the subgroup size is... " << subgroup.size() << endl; return 0; } // ---------- end of function main ---------- *1. Why every process has rank 1 in subgroup? I trying to figure out what happens, but without success.* The mpi::boost::group class has no copy constructor explicitly defined. That is true for many other classes in Boost.MPI... *2. It's safe to use the copy constructor generated by the compiler as follows?* * * mpi::group subgroup = world.group().exclude( discardedRanks.begin(), discardedRanks.end() ); Thanks in advance for any help. Regards, Júlio.
Forgive the last e-mail... Sorry. The first two questions still alive. Júlio. ---------- Forwarded message ---------- From: Júlio Hoffimann <julio.hoffimann@gmail.com> Date: 2011/2/7 Subject: Fwd: Boost.MPI --- boost::mpi::group class To: boost-users@lists.boost.org Oh my god, it's not implemented, right? boost::mpi::group(const MPI_Group& in_group, bool adopt); I will have to use OpenMPI C++ terrible bindings. :-( Júlio. ---------- Forwarded message ---------- From: Júlio Hoffimann <julio.hoffimann@gmail.com> Date: 2011/2/7 Subject: Boost.MPI --- boost::mpi::group class To: boost-users@lists.boost.org Hi, It's my first time using Boost and is amazing. I'm trying to understand why this simple example bellow don't works as expected: #include <iostream> #include <boost/mpi.hpp> using namespace std; namespace mpi = boost::mpi; int main ( int argc, char *argv[] ) { mpi::environment env( argc, argv ); mpi::communicator world; mpi::group subgroup( MPI_Group( world.group() ), true ); cout << "I'm process " << world.rank() << endl; cout << "But in subgroup i'm process " << subgroup.rank() << endl; cout << "And the subgroup size is... " << subgroup.size() << endl; return 0; } // ---------- end of function main ---------- *1. Why every process has rank 1 in subgroup? I trying to figure out what happens, but without success.* The mpi::boost::group class has no copy constructor explicitly defined. That is true for many other classes in Boost.MPI... *2. It's safe to use the copy constructor generated by the compiler as follows?* * * mpi::group subgroup = world.group().exclude( discardedRanks.begin(), discardedRanks.end() ); Thanks in advance for any help. Regards, Júlio.
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Júlio Hoffimann