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examples/extended/parallel/MPI/source/src/G4MPIntupleMerger.cc

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+//
+// ********************************************************************
+// * License and Disclaimer                                           *
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+// *                                                                  *
+// * This  code  implementation is the result of  the  scientific and *
+// * technical work of the GEANT4 collaboration.                      *
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+// ********************************************************************
+//
+// Class for configuring G4analysis for merging ntuples via MPI
+//
+// Author: Ivana Hrivnacova, 21/11/2018 (ivana@ipno.in2p3.fr)
+
+#include "G4MPIntupleMerger.hh"
+#include "G4RootMpiAnalysisManager.hh"
+#include "G4ios.hh"
+
+#include "tools/mpi/wrmpi"
+
+#include <mpi.h>
+
+
+G4MPIntupleMerger::G4MPIntupleMerger(G4int nofReducedNtupleFiles,
+                                     G4bool rowWise)
+{
+  // Configure MPI using  G4MPImanager
+
+  // G4cout << "Start configure ntuple MPI merging" << G4endl;
+
+  // Create MPI Root analysis manager
+  G4bool isMaster = true;
+  auto analysisManager
+    = new G4RootMpiAnalysisManager(isMaster);
+  // G4cout << "Start configure ntuple MPI merging" << G4endl;
+
+  // Get communicator
+  G4MPImanager* mpiManager = G4MPImanager::GetManager();
+  G4int mpiRank = mpiManager->GetRank();
+  G4int mpiSize = mpiManager->GetActiveSize();
+  auto comm  = mpiManager->GetAllComm();
+
+  // G4int tag = G4MPImanager::kTAG_NTUPLE;
+  fWrmpi = new tools::mpi::wrmpi(G4cout, *comm);
+
+  analysisManager->SetMpiNtupleMerging(
+    fWrmpi, mpiRank, mpiSize, nofReducedNtupleFiles, rowWise);
+
+  // G4cout << "End configure ntuple MPI merging" << G4endl;
+}
+
+G4MPIntupleMerger::~G4MPIntupleMerger()
+{
+  delete fWrmpi;
+}