3 files changed, 4 insertions, 2 deletions
diff --git a/gi/pyp-topics/src/mpi-pyp-topics.cc b/gi/pyp-topics/src/mpi-pyp-topics.cc
index 3a3c4d67..fa951156 100644
--- a/gi/pyp-topics/src/mpi-pyp-topics.cc
+++ b/gi/pyp-topics/src/mpi-pyp-topics.cc
@@ -9,7 +9,6 @@ void MPIPYPTopics::sample_corpus(const Corpus& corpus, int samples,
                               int freq_cutoff_interval,
                               int max_contexts_per_document) {
   Timer timer;
-  std::cout << m_am_root << std::endl;
 
   int documents = corpus.num_documents();
   m_mpi_start = 0;
diff --git a/gi/pyp-topics/src/mpi-pyp.hh b/gi/pyp-topics/src/mpi-pyp.hh
index 0328b387..c2341b9e 100644
--- a/gi/pyp-topics/src/mpi-pyp.hh
+++ b/gi/pyp-topics/src/mpi-pyp.hh
@@ -352,6 +352,8 @@ struct triple {
   }
 };
 
+BOOST_IS_BITWISE_SERIALIZABLE(MPIPYP<int>::dish_delta_type)
+BOOST_CLASS_TRACKING(MPIPYP<int>::dish_delta_type,track_never)
 
 template <typename Dish, typename Hash>
 void 
diff --git a/gi/pyp-topics/src/mpi-train-contexts.cc b/gi/pyp-topics/src/mpi-train-contexts.cc
index 6e1e78a5..4f966a65 100644
--- a/gi/pyp-topics/src/mpi-train-contexts.cc
+++ b/gi/pyp-topics/src/mpi-train-contexts.cc
@@ -30,7 +30,7 @@ int main(int argc, char **argv)
   mpi::environment env(argc, argv);
   mpi::communicator world;
   int rank = world.rank();
-  bool am_root = rank;
+  bool am_root = (rank==0);
   if (am_root) cout << "Pitman Yor topic models: Copyright 2010 Phil Blunsom\n";
   if (am_root) std::cout << "I am process " << world.rank() << " of " << world.size() << "." << std::endl;
   if (am_root) cout << REVISION << '\n' <<endl;
@@ -154,6 +154,7 @@ int main(int argc, char **argv)
       documents_out <<endl;
     }
     documents_out.close();
+    world.barrier();
 
     if (am_root) {
       ogzstream root_documents_out(vm["document-topics-out"].as<string>().c_str());