diff --git a/CMakeLists_files.cmake b/CMakeLists_files.cmake
index 994f610fd..55f4ac5ca 100644
--- a/CMakeLists_files.cmake
+++ b/CMakeLists_files.cmake
@@ -135,6 +135,7 @@ list (APPEND PUBLIC_HEADER_FILES
 	opm/autodiff/NewtonSolver.hpp
 	opm/autodiff/NewtonSolver_impl.hpp
 	opm/autodiff/LinearisedBlackoilResidual.hpp
+	opm/autodiff/ParallelDebugOutput.hpp
 	opm/autodiff/RateConverter.hpp
 	opm/autodiff/RedistributeDataHandles.hpp
 	opm/autodiff/SimulatorBase.hpp
diff --git a/examples/flow.cpp b/examples/flow.cpp
index 896659d33..7ccd5016e 100644
--- a/examples/flow.cpp
+++ b/examples/flow.cpp
@@ -251,7 +251,6 @@ try
     }
 
     const PhaseUsage pu = Opm::phaseUsageFromDeck(deck);
-    Opm::BlackoilOutputWriter outputWriter(grid, param, eclipseState, pu );
 
     std::vector<int> compressedToCartesianIdx;
     Opm::createGlobalCellArray(grid, compressedToCartesianIdx);
@@ -343,17 +342,14 @@ try
     // and initilialize new properties and states for it.
     if( mpi_size > 1 )
     {
-        if( param.getDefault("output_matlab", false) || param.getDefault("output_ecl", true) )
-        {
-        	std::cerr << "We only support vtk output during parallel runs. \n"
-                      << "Please use \"output_matlab=false output_ecl=false\" to deactivate the \n"
-                      << "other outputs!" << std::endl;
-        	return EXIT_FAILURE;
-        }
-
         Opm::distributeGridAndData( grid, eclipseState, state, new_props, geoprops, parallel_information, use_local_perm );
     }
 
+    // create output writer after grid is distributed, otherwise the parallel output
+    // won't work correctly since we need to create a mapping from the distributed to
+    // the global view
+    Opm::BlackoilOutputWriter outputWriter(grid, param, eclipseState, pu );
+
     // Solver for Newton iterations.
     std::unique_ptr<NewtonIterationBlackoilInterface> fis_solver;
     if (param.getDefault("use_interleaved", true)) {
diff --git a/opm/autodiff/ParallelDebugOutput.hpp b/opm/autodiff/ParallelDebugOutput.hpp
new file mode 100644
index 000000000..b80e8e8c3
--- /dev/null
+++ b/opm/autodiff/ParallelDebugOutput.hpp
@@ -0,0 +1,553 @@
+/*
+  Copyright 2015 IRIS AS
+
+  This file is part of the Open Porous Media project (OPM).
+
+  OPM is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  OPM is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with OPM.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#ifndef OPM_PARALLELDEBUGOUTPUT_HEADER_INCLUDED
+#define OPM_PARALLELDEBUGOUTPUT_HEADER_INCLUDED
+
+#include <opm/core/grid.h>
+#include <opm/core/simulator/SimulatorState.hpp>
+#include <opm/core/simulator/WellState.hpp>
+#include <opm/core/wells/WellsManager.hpp>
+
+#include <opm/autodiff/WellStateFullyImplicitBlackoil.hpp>
+#include <opm/autodiff/WellStateFullyImplicitBlackoil.hpp>
+
+#if HAVE_DUNE_CORNERPOINT
+#include <dune/grid/common/p2pcommunicator.hh>
+#endif
+
+namespace Opm
+{
+
+    class ParallelDebugOutputInterface
+    {
+    protected:
+        ParallelDebugOutputInterface () {}
+    public:
+        virtual ~ParallelDebugOutputInterface() {}
+
+        // gather solution to rank 0 for EclipseWriter
+        virtual bool collectToIORank( const SimulatorState& localReservoirState,
+                                      const WellState& localWellState ) = 0;
+
+        virtual const SimulatorState& globalReservoirState() const = 0 ;
+        virtual const WellState& globalWellState() const = 0 ;
+        virtual bool isIORank() const = 0;
+        virtual int numCells() const = 0 ;
+        virtual const int* globalCell() const = 0;
+    };
+
+    template <class GridImpl>
+    class ParallelDebugOutput : public ParallelDebugOutputInterface
+    {
+    protected:
+        const GridImpl& grid_;
+
+        const SimulatorState* globalState_;
+        const WellState*      wellState_;
+
+    public:
+        ParallelDebugOutput ( const GridImpl& grid,
+                         Opm::EclipseStateConstPtr eclipseState,
+                         const int )
+            : grid_( grid ) {}
+
+        // gather solution to rank 0 for EclipseWriter
+        virtual bool collectToIORank( const SimulatorState& localReservoirState,
+                                      const WellState& localWellState )
+        {
+            globalState_ = &localReservoirState;
+            wellState_   = &localWellState;
+            return true ;
+        }
+
+        virtual const SimulatorState& globalReservoirState() const { return *globalState_; }
+        virtual const WellState& globalWellState() const { return *wellState_; }
+        virtual bool isIORank () const { return true; }
+        virtual int numCells() const { return grid_.number_of_cells; }
+        virtual const int* globalCell() const { return grid_.global_cell; }
+    };
+
+#if HAVE_DUNE_CORNERPOINT
+    template <>
+    class ParallelDebugOutput< Dune::CpGrid> : public ParallelDebugOutputInterface
+    {
+    public:
+        typedef Dune::CpGrid Grid;
+        typedef typename Grid :: CollectiveCommunication  CollectiveCommunication;
+
+        // global id
+        class GlobalCellIndex
+        {
+            int globalId_;
+            int localIndex_;
+            bool isInterior_;
+        public:
+            GlobalCellIndex() : globalId_(-1), localIndex_(-1), isInterior_(true) {}
+            void setGhost() { isInterior_ = false; }
+
+            void setId( const int globalId ) { globalId_ = globalId; }
+            void setIndex( const int localIndex ) { localIndex_ = localIndex; }
+
+            int localIndex () const { return localIndex_; }
+            int id () const { return globalId_; }
+            bool isInterior() const { return isInterior_; }
+        };
+
+        typedef typename Dune::PersistentContainer< Grid, GlobalCellIndex > GlobalIndexContainer;
+
+        static const int dimension = Grid :: dimension ;
+
+        typedef typename Grid :: LeafGridView             GridView;
+        typedef GridView                                  AllGridView;
+
+        typedef Dune :: Point2PointCommunicator< Dune :: SimpleMessageBuffer > P2PCommunicatorType;
+        typedef typename P2PCommunicatorType :: MessageBufferType MessageBufferType;
+
+        typedef std::vector< GlobalCellIndex > LocalIndexMapType;
+
+        typedef std::vector<int> IndexMapType;
+        typedef std::vector< IndexMapType > IndexMapStorageType;
+
+        class DistributeIndexMapping : public P2PCommunicatorType::DataHandleInterface
+        {
+        protected:
+            const std::vector<int>& distributedGlobalIndex_;
+            IndexMapType& localIndexMap_;
+            IndexMapStorageType& indexMaps_;
+            std::map< const int, const int > globalPosition_;
+            std::set< int > checkPosition_;
+
+        public:
+            DistributeIndexMapping( const std::vector<int>& globalIndex,
+                                    const std::vector<int>& distributedGlobalIndex,
+                                    IndexMapType& localIndexMap,
+                                    IndexMapStorageType& indexMaps )
+            : distributedGlobalIndex_( distributedGlobalIndex ),
+              localIndexMap_( localIndexMap ),
+              indexMaps_( indexMaps ),
+              globalPosition_()
+            {
+                const size_t size = globalIndex.size();
+                // create mapping globalIndex --> localIndex
+                for ( size_t index = 0; index < size; ++index )
+                {
+                    globalPosition_.insert( std::make_pair( globalIndex[ index ], index ) );
+                }
+
+                if( ! indexMaps_.empty() )
+                {
+                    // for the ioRank create a localIndex to index in global state map
+                    IndexMapType& indexMap = indexMaps_.back();
+                    const size_t localSize = localIndexMap_.size();
+                    indexMap.resize( localSize );
+                    for( size_t i=0; i<localSize; ++i )
+                    {
+                        const int id = distributedGlobalIndex_[ localIndexMap_[ i ] ];
+                        indexMap[ i ] = id ;
+#ifndef NDEBUG
+                        assert( checkPosition_.find( id ) == checkPosition_.end() );
+                        checkPosition_.insert( id );
+#endif
+                    }
+                }
+            }
+
+            void pack( const int link, MessageBufferType& buffer )
+            {
+                // we should only get one link
+                assert( link == 0 );
+
+                // pack all interior global cell id's
+                const int size = localIndexMap_.size();
+                buffer.write( size );
+
+                for( int index = 0; index < size; ++index )
+                {
+                    const int globalIdx = distributedGlobalIndex_[ localIndexMap_[ index ] ];
+                    buffer.write( globalIdx );
+                }
+            }
+
+            void unpack( const int link, MessageBufferType& buffer )
+            {
+                // get index map for current link
+                IndexMapType& indexMap = indexMaps_[ link ];
+                assert( ! globalPosition_.empty() );
+
+                // unpack all interior global cell id's
+                int numCells = 0;
+                buffer.read( numCells );
+                indexMap.resize( numCells );
+                for( int index = 0; index < numCells; ++index )
+                {
+                    int globalId = -1;
+                    buffer.read( globalId );
+                    assert( globalPosition_.find( globalId ) != globalPosition_.end() );
+                    indexMap[ index ] = globalPosition_[ globalId ];
+#ifndef NDEBUG
+                    assert( checkPosition_.find( globalId ) == checkPosition_.end() );
+                    checkPosition_.insert( globalId );
+#endif
+                }
+            }
+        };
+
+        enum { ioRank = 0 };
+
+        ParallelDebugOutput( const Dune::CpGrid& otherGrid,
+                             Opm::EclipseStateConstPtr eclipseState,
+                             const int numPhases )
+            : toIORankComm_( otherGrid.comm() ),
+              isIORank_( otherGrid.comm().rank() == ioRank )
+        {
+            const CollectiveCommunication& comm = otherGrid.comm();
+            std::set< int > send, recv;
+            // the I/O rank receives from all other ranks
+            if( isIORank() )
+            {
+                Dune::CpGrid globalGrid( otherGrid );
+                globalGrid.switchToGlobalView();
+
+                // initialize global state with correct sizes
+                globalReservoirState_.init( globalGrid.numCells(), globalGrid.numFaces(), numPhases );
+                // TODO init well state
+
+                // Create wells and well state.
+                WellsManager wells_manager(eclipseState,
+                                           0,
+                                           Opm::UgGridHelpers::numCells( globalGrid ),
+                                           Opm::UgGridHelpers::globalCell( globalGrid ),
+                                           Opm::UgGridHelpers::cartDims( globalGrid ),
+                                           Opm::UgGridHelpers::dimensions( globalGrid ),
+                                           Opm::UgGridHelpers::cell2Faces( globalGrid ),
+                                           Opm::UgGridHelpers::beginFaceCentroids( globalGrid ),
+                                           0,
+                                           false);
+                const Wells* wells = wells_manager.c_wells();
+                globalWellState_.init(wells, globalReservoirState_, globalWellState_ );
+
+                // copy global cartesian index
+                globalIndex_ = globalGrid.globalCell();
+
+                unsigned int count = 0;
+                auto gridView = globalGrid.leafGridView();
+                for( auto it = gridView.template begin< 0 >(),
+                     end = gridView.template end< 0 >(); it != end; ++it, ++count )
+                {
+                }
+                assert( count == globalIndex_.size() );
+
+                for(int i=0; i<comm.size(); ++i)
+                {
+                    if( i != ioRank )
+                    {
+                        recv.insert( i );
+                    }
+                }
+            }
+            else // all other simply send to the I/O rank
+            {
+                send.insert( ioRank );
+            }
+
+            localIndexMap_.clear();
+            localIndexMap_.reserve( otherGrid.size( 0 ) );
+
+            unsigned int index = 0;
+            auto localView = otherGrid.leafGridView();
+            for( auto it = localView.template begin< 0 >(),
+                 end = localView.template end< 0 >(); it != end; ++it, ++index )
+            {
+                const auto element = *it ;
+                // only store interior element for collection
+                if( element.partitionType() == Dune :: InteriorEntity )
+                {
+                    localIndexMap_.push_back( index );
+                }
+            }
+
+            // insert send and recv linkage to communicator
+            toIORankComm_.insertRequest( send, recv );
+
+            if( isIORank() )
+            {
+                // need an index map for each rank
+                indexMaps_.clear();
+                indexMaps_.resize( comm.size() );
+            }
+
+            // distribute global id's to io rank for later association of dof's
+            DistributeIndexMapping distIndexMapping( globalIndex_, otherGrid.globalCell(), localIndexMap_, indexMaps_ );
+            toIORankComm_.exchange( distIndexMapping );
+        }
+
+        class PackUnPackSimulatorState : public P2PCommunicatorType::DataHandleInterface
+        {
+            const SimulatorState& localState_;
+            SimulatorState& globalState_;
+            const WellState& localWellState_;
+            WellState& globalWellState_;
+            const IndexMapType& localIndexMap_;
+            const IndexMapStorageType& indexMaps_;
+
+        public:
+            PackUnPackSimulatorState( const SimulatorState& localState,
+                                      SimulatorState& globalState,
+                                      const WellState& localWellState,
+                                      WellState& globalWellState,
+                                      const IndexMapType& localIndexMap,
+                                      const IndexMapStorageType& indexMaps,
+                                      const bool isIORank )
+            : localState_( localState ),
+              globalState_( globalState ),
+              localWellState_( localWellState ),
+              globalWellState_( globalWellState ),
+              localIndexMap_( localIndexMap ),
+              indexMaps_( indexMaps )
+            {
+                if( isIORank )
+                {
+                    // add missing data to global state
+                    for( size_t i=globalState_.cellData().size();
+                         i<localState.cellData().size(); ++i )
+                    {
+                        const size_t components = localState.cellData()[ i ].size() / localState.numCells();
+                        assert( components * localState.numCells() == localState.cellData()[ i ].size() );
+                        globalState_.registerCellData( localState.cellDataNames()[ i ], components );
+                    }
+
+                    MessageBufferType buffer;
+                    pack( 0, buffer );
+                    // the last index map is the local one
+                    doUnpack( indexMaps.back(), buffer );
+                }
+            }
+
+            // pack all data associated with link
+            void pack( const int link, MessageBufferType& buffer )
+            {
+                // we should only get one link
+                assert( link == 0 );
+
+                // write all cell data registered in local state
+                const size_t numCells = localState_.numCells();
+                const size_t numCellData = localState_.cellData().size();
+                for( size_t d=0; d<numCellData; ++d )
+                {
+                    const std::vector< double >& data = localState_.cellData()[ d ];
+                    const size_t stride = data.size() / numCells ;
+                    assert( numCells * stride == data.size() );
+
+                    for( size_t i=0; i<stride; ++i )
+                    {
+                        // write all data from local state to buffer
+                        write( buffer, localIndexMap_, data, i, stride );
+                    }
+                }
+
+                // write all data from local well state to buffer
+                writeWells( buffer );
+            }
+
+            void doUnpack( const IndexMapType& indexMap, MessageBufferType& buffer )
+            {
+                // read all cell data registered in local state
+                const size_t numCells = globalState_.numCells();
+                const size_t numCellData = globalState_.cellData().size();
+                for( size_t d=0; d<numCellData; ++d )
+                {
+                    std::vector< double >& data = globalState_.cellData()[ d ];
+                    const size_t stride = data.size() / numCells ;
+                    assert( numCells * stride == data.size() );
+
+                    for( size_t i=0; i<stride; ++i )
+                    {
+                        // write all data from local state to buffer
+                        read( buffer, indexMap, data, i, stride );
+                    }
+                }
+
+                // read well data from buffer
+                readWells( buffer );
+            }
+
+            // unpack all data associated with link
+            void unpack( const int link, MessageBufferType& buffer )
+            {
+                doUnpack( indexMaps_[ link ], buffer );
+            }
+
+        protected:
+            template <class Vector>
+            void write( MessageBufferType& buffer, const IndexMapType& localIndexMap,
+                        const Vector& vector,
+                        const unsigned int offset = 0, const unsigned int stride = 1 ) const
+            {
+                unsigned int size = localIndexMap.size();
+                buffer.write( size );
+                assert( vector.size() >= stride * size );
+                for( unsigned int i=0; i<size; ++i )
+                {
+                    const unsigned int index = localIndexMap[ i ] * stride + offset;
+                    buffer.write( vector[ index ] );
+                }
+            }
+
+            template <class Vector>
+            void read( MessageBufferType& buffer,
+                       const IndexMapType& indexMap,
+                       Vector& vector,
+                       const unsigned int offset = 0, const unsigned int stride = 1 ) const
+            {
+                unsigned int size = 0;
+                buffer.read( size );
+                assert( size == indexMap.size() );
+                for( unsigned int i=0; i<size; ++i )
+                {
+                    const unsigned int index = indexMap[ i ] * stride + offset;
+                    buffer.read( vector[ index ] );
+                }
+            }
+
+            void writeString( MessageBufferType& buffer, const std::string& s) const
+            {
+                const int size = s.size();
+                buffer.write( size );
+                for( int i=0; i<size; ++i )
+                {
+                    buffer.write( s[ i ] );
+                }
+            }
+
+            void readString( MessageBufferType& buffer, std::string& s) const
+            {
+                int size = -1;
+                buffer.read( size );
+                s.resize( size );
+                for( int i=0; i<size; ++i )
+                {
+                    buffer.read( s[ i ] );
+                }
+            }
+
+            void writeWells( MessageBufferType& buffer ) const
+            {
+                int nWells = localWellState_.wellMap().size();
+                buffer.write( nWells );
+                auto end = localWellState_.wellMap().end();
+                for( auto it = localWellState_.wellMap().begin(); it != end; ++it )
+                {
+                    const std::string& name = it->first;
+                    const int wellIdx = it->second[ 0 ];
+
+                    // write well name
+                    writeString( buffer, name );
+
+                    // write well data
+                    buffer.write( localWellState_.bhp()[ wellIdx ] );
+                    buffer.write( localWellState_.thp()[ wellIdx ] );
+                    const int wellRateIdx = wellIdx * localWellState_.numPhases();
+                    for( int np=0; np<localWellState_.numPhases(); ++np )
+                        buffer.write( localWellState_.wellRates()[ wellRateIdx + np ] );
+
+                    // TODO: perfRates and perfPress, need to figure out the index
+                    // mapping there.
+                }
+            }
+
+            void readWells( MessageBufferType& buffer )
+            {
+                int nWells = -1;
+                buffer.read( nWells );
+                // unpack all wells that have been sent
+                std::string name ;
+                for( int well = 0; well < nWells ; ++well )
+                {
+                    // read well name for local identification
+                    readString( buffer, name );
+
+                    // unpack values
+                    auto it = globalWellState_.wellMap().find( name );
+                    if( it == globalWellState_.wellMap().end() )
+                    {
+                        OPM_THROW(std::logic_error,"global state does not contain well " <<  name );
+                    }
+                    const int wellIdx = it->second[ 0 ];
+
+                    buffer.read( globalWellState_.bhp()[ wellIdx ] );
+                    buffer.read( globalWellState_.thp()[ wellIdx ] );
+                    const int wellRateIdx = wellIdx * globalWellState_.numPhases();
+                    for( int np=0; np<globalWellState_.numPhases(); ++np )
+                        buffer.read( globalWellState_.wellRates()[ wellRateIdx + np ] );
+
+                    // TODO: perfRates and perfPress, need to figure out the index
+                    // mapping there.
+                }
+            }
+
+        };
+
+        // gather solution to rank 0 for EclipseWriter
+        bool collectToIORank( const SimulatorState& localReservoirState,
+                              const WellState& localWellState )
+        {
+            PackUnPackSimulatorState packUnpack( localReservoirState, globalReservoirState_,
+                                                 localWellState, globalWellState_,
+                                                 localIndexMap_, indexMaps_, isIORank() );
+
+            //toIORankComm_.exchangeCached( packUnpack );
+            toIORankComm_.exchange( packUnpack );
+#ifndef NDEBUG
+            // mkae sure every process is on the same page
+            toIORankComm_.barrier();
+#endif
+            return isIORank();
+        }
+
+        const SimulatorState& globalReservoirState() const { return globalReservoirState_; }
+        const WellState& globalWellState() const { return globalWellState_; }
+
+        bool isIORank() const
+        {
+            return isIORank_;
+        }
+
+        int numCells () const { return globalIndex_.size(); }
+        const int* globalCell () const
+        {
+            assert( ! globalIndex_.empty() );
+            return globalIndex_.data();
+        }
+
+    protected:
+        P2PCommunicatorType             toIORankComm_;
+        IndexMapType                    globalIndex_;
+        IndexMapType                    localIndexMap_;
+        IndexMapStorageType             indexMaps_;
+        //BlackoilState                   globalReservoirState_;
+        SimulatorState                  globalReservoirState_;
+        // this needs to be revised
+        WellStateFullyImplicitBlackoil  globalWellState_;
+        // true if we are on I/O rank
+        const bool                      isIORank_;
+    };
+#endif // #if HAVE_DUNE_CORNERPOINT
+
+} // end namespace Opm
+#endif
diff --git a/opm/autodiff/SimulatorFullyImplicitBlackoilOutput.cpp b/opm/autodiff/SimulatorFullyImplicitBlackoilOutput.cpp
index e6c93687a..da5b2ae59 100644
--- a/opm/autodiff/SimulatorFullyImplicitBlackoilOutput.cpp
+++ b/opm/autodiff/SimulatorFullyImplicitBlackoilOutput.cpp
@@ -235,52 +235,75 @@ namespace Opm
     void
     BlackoilOutputWriter::
     writeTimeStep(const SimulatorTimerInterface& timer,
-                  const SimulatorState& state,
-                  const WellState& wellState,
+                  const SimulatorState& localState,
+                  const WellState& localWellState,
                   bool substep)
     {
-        // VTK output
+        // VTK output (is parallel if grid is parallel)
         if( vtkWriter_ ) {
-            vtkWriter_->writeTimeStep( timer, state, wellState , false );
+            vtkWriter_->writeTimeStep( timer, localState, localWellState, false );
         }
-        // Matlab output
-        if( matlabWriter_ ) {
-            matlabWriter_->writeTimeStep( timer, state, wellState , false );
-        }
-        // ECL output
-        if ( eclWriter_ ) {
-            eclWriter_->writeTimeStep(timer, state, wellState, substep);
-        }
-        // write backup file
-        if( backupfile_ )
+
+        if( parallelOutput_ )
         {
-            int reportStep      = timer.reportStepNum();
-            int currentTimeStep = timer.currentStepNum();
-            if( (reportStep == currentTimeStep || // true for SimulatorTimer
-                 currentTimeStep == 0 || // true for AdaptiveSimulatorTimer at reportStep
-                 timer.done() ) // true for AdaptiveSimulatorTimer at reportStep
-               && lastBackupReportStep_ != reportStep ) // only backup report step once
+
+            // collect all solutions to I/O rank
+            const bool isIORank = parallelOutput_->collectToIORank( localState, localWellState );
+
+            if( isIORank )
             {
-                // store report step
-                lastBackupReportStep_ = reportStep;
-                // write resport step number
-                backupfile_.write( (const char *) &reportStep, sizeof(int) );
+                const SimulatorState& state = parallelOutput_->globalReservoirState();
+                const WellState& wellState  = parallelOutput_->globalWellState();
+                //std::cout << "number of wells" << wellState.bhp().size() << std::endl;
 
-                const BlackoilState& boState = dynamic_cast< const BlackoilState& > (state);
-                backupfile_ << boState;
-
-                const WellStateFullyImplicitBlackoil& boWellState = static_cast< const WellStateFullyImplicitBlackoil& > (wellState);
-                backupfile_ << boWellState;
-                /*
-                const WellStateFullyImplicitBlackoil* boWellState =
-                    dynamic_cast< const WellStateFullyImplicitBlackoil* > (&wellState);
-                if( boWellState ) {
-                    backupfile_ << (*boWellState);
+                // Matlab output
+                if( matlabWriter_ ) {
+                    matlabWriter_->writeTimeStep( timer, state, wellState, substep );
+                }
+                // ECL output
+                if ( eclWriter_ ) {
+                    eclWriter_->writeTimeStep(timer, state, wellState, substep );
+                }
+
+                // write backup file
+                if( backupfile_ )
+                {
+                    int reportStep      = timer.reportStepNum();
+                    int currentTimeStep = timer.currentStepNum();
+                    if( (reportStep == currentTimeStep || // true for SimulatorTimer
+                         currentTimeStep == 0 || // true for AdaptiveSimulatorTimer at reportStep
+                         timer.done() ) // true for AdaptiveSimulatorTimer at reportStep
+                       && lastBackupReportStep_ != reportStep ) // only backup report step once
+                    {
+                        // store report step
+                        lastBackupReportStep_ = reportStep;
+                        // write resport step number
+                        backupfile_.write( (const char *) &reportStep, sizeof(int) );
+
+                        try {
+                            const BlackoilState& boState = dynamic_cast< const BlackoilState& > (state);
+                            backupfile_ << boState;
+
+                            const WellStateFullyImplicitBlackoil& boWellState = static_cast< const WellStateFullyImplicitBlackoil& > (wellState);
+                            backupfile_ << boWellState;
+                        }
+                        catch ( const std::bad_cast& e )
+                        {
+
+                        }
+
+                        /*
+                        const WellStateFullyImplicitBlackoil* boWellState =
+                            dynamic_cast< const WellStateFullyImplicitBlackoil* > (&wellState);
+                        if( boWellState ) {
+                            backupfile_ << (*boWellState);
+                        }
+                        else
+                            OPM_THROW(std::logic_error,"cast to WellStateFullyImplicitBlackoil failed");
+                        */
+                        backupfile_ << std::flush;
+                    }
                 }
-                else
-                    OPM_THROW(std::logic_error,"cast to WellStateFullyImplicitBlackoil failed");
-                */
-                backupfile_ << std::flush;
             }
         }
     }
diff --git a/opm/autodiff/SimulatorFullyImplicitBlackoilOutput.hpp b/opm/autodiff/SimulatorFullyImplicitBlackoilOutput.hpp
index 0c0b59a57..c21fde881 100644
--- a/opm/autodiff/SimulatorFullyImplicitBlackoilOutput.hpp
+++ b/opm/autodiff/SimulatorFullyImplicitBlackoilOutput.hpp
@@ -31,6 +31,7 @@
 #include <opm/core/io/eclipse/EclipseWriter.hpp>
 
 #include <opm/autodiff/GridHelpers.hpp>
+#include <opm/autodiff/ParallelDebugOutput.hpp>
 
 #include <opm/autodiff/WellStateFullyImplicitBlackoil.hpp>
 
@@ -214,8 +215,10 @@ namespace Opm
                      const int desiredReportStep);
 
     protected:
-        // Parameters for output.
         const bool output_;
+        std::unique_ptr< ParallelDebugOutputInterface > parallelOutput_;
+
+        // Parameters for output.
         const std::string outputDir_;
         const int output_interval_;
 
@@ -241,21 +244,24 @@ namespace Opm
                          Opm::EclipseStateConstPtr eclipseState,
                          const Opm::PhaseUsage &phaseUsage )
       : output_( param.getDefault("output", true) ),
+        parallelOutput_( output_ ? new ParallelDebugOutput< Grid >( grid, eclipseState, phaseUsage.num_phases ) : 0 ),
         outputDir_( output_ ? param.getDefault("output_dir", std::string("output")) : "." ),
         output_interval_( output_ ? param.getDefault("output_interval", 1): 0 ),
         lastBackupReportStep_( -1 ),
         vtkWriter_( output_ && param.getDefault("output_vtk",false) ?
                      new BlackoilVTKWriter< Grid >( grid, outputDir_ ) : 0 ),
-        matlabWriter_( output_ && param.getDefault("output_matlab", false) ?
+        matlabWriter_( output_ && parallelOutput_->isIORank() &&
+                       param.getDefault("output_matlab", false) ?
                      new BlackoilMatlabWriter< Grid >( grid, outputDir_ ) : 0 ),
-        eclWriter_( output_ && param.getDefault("output_ecl", true) ?
+        eclWriter_( output_ && parallelOutput_->isIORank() &&
+                    param.getDefault("output_ecl", true) ?
                     new EclipseWriter(param, eclipseState, phaseUsage,
-                                      Opm::UgGridHelpers::numCells( grid ),
-                                      Opm::UgGridHelpers::globalCell( grid ) )
+                                      parallelOutput_->numCells(),
+                                      parallelOutput_->globalCell() )
                    : 0 )
     {
         // For output.
-        if (output_) {
+        if (output_ && parallelOutput_->isIORank() ) {
             // Ensure that output dir exists
             boost::filesystem::path fpath(outputDir_);
             try {
diff --git a/opm/autodiff/WellStateFullyImplicitBlackoil.hpp b/opm/autodiff/WellStateFullyImplicitBlackoil.hpp
index 9ea5b9379..d84e51472 100644
--- a/opm/autodiff/WellStateFullyImplicitBlackoil.hpp
+++ b/opm/autodiff/WellStateFullyImplicitBlackoil.hpp
@@ -43,12 +43,14 @@ namespace Opm
     {
         typedef WellState  BaseType;
     public:
-        typedef std::array< int, 3 >  mapentry_t;
-        typedef std::map< std::string, mapentry_t > WellMapType;
+        typedef BaseType :: WellMapType WellMapType;
 
         using BaseType :: wellRates;
         using BaseType :: bhp;
         using BaseType :: perfPress;
+        using BaseType :: wellMap;
+        using BaseType :: numWells;
+        using BaseType :: numPhases;
 
         /// Allocate and initialize if wells is non-null.  Also tries
         /// to give useful initial values to the bhp(), wellRates()
@@ -57,7 +59,7 @@ namespace Opm
         void init(const Wells* wells, const State& state, const PrevState& prevState)
         {
             // clear old name mapping
-            wellMap_.clear();
+            wellMap().clear();
 
             if (wells == 0) {
                 return;
@@ -79,18 +81,12 @@ namespace Opm
             for (int w = 0; w < nw; ++w) {
                 assert((wells->type[w] == INJECTOR) || (wells->type[w] == PRODUCER));
                 const WellControls* ctrl = wells->ctrls[w];
-                std::string name( wells->name[ w ] );
-                assert( name.size() > 0 );
-                mapentry_t& wellMapEntry = wellMap_[name];
-                wellMapEntry[ 0 ] = w;
-                wellMapEntry[ 1 ] = wells->well_connpos[w];
-                // also store the number of perforations in this well
-                const int num_perf_this_well = wells->well_connpos[w + 1] - wells->well_connpos[w];
-                wellMapEntry[ 2 ] = num_perf_this_well;
 
                 if (well_controls_well_is_stopped(ctrl)) {
                     // Shut well: perfphaserates_ are all zero.
                 } else {
+                    // also store the number of perforations in this well
+                    const int num_perf_this_well = wells->well_connpos[w + 1] - wells->well_connpos[w];
                     // Open well: Initialize perfphaserates_ to well
                     // rates divided by the number of perforations.
                     for (int perf = wells->well_connpos[w]; perf < wells->well_connpos[w + 1]; ++perf) {
@@ -185,21 +181,6 @@ namespace Opm
         std::vector<int>& currentControls() { return current_controls_; }
         const std::vector<int>& currentControls() const { return current_controls_; }
 
-        /// The number of wells present.
-        int numWells() const
-        {
-            return bhp().size();
-        }
-
-        /// The number of phases present.
-        int numPhases() const
-        {
-            return wellRates().size() / numWells();
-        }
-
-        const WellMapType& wellMap() const { return wellMap_; }
-        WellMapType& wellMap() { return wellMap_; }
-
     private:
         std::vector<double> perfphaserates_;
         std::vector<int> current_controls_;