MPIClusterSvc Node1 MPIClusterSvc - m_env - m_world - m_datacom - m_rank - m_mpiLog - m_mpiLog_addEvent - m_mpiLog_completeEvent + MPIClusterSvc() + initialize() + finalize() + numRanks() + rank() + barrier() + abort() + sendMessage() + waitReceiveMessage() + data_communicator() + log_addEvent() + log_completeEvent() Node2 extends< AthService, IMPIClusterSvc > Node2->Node1