From bae31764dc352ce7a6cfd33b94c01ed892cbe333 Mon Sep 17 00:00:00 2001
From: Hrvoje Jasak <h.jasak@wikki.co.uk>
Date: Wed, 10 May 2017 13:19:15 +0100
Subject: [PATCH] Changed crMatrix and crAddressing member naming

---
 src/foam/matrices/crMatrix/crAddressing.C     |  77 ++--
 src/foam/matrices/crMatrix/crAddressing.H     |  31 +-
 src/foam/matrices/crMatrix/crMatrix.C         |  12 +-
 src/foam/matrices/crMatrix/crMatrix.H         |   8 +-
 .../processorSAMGInterface.C                  | 339 +++++++++---------
 .../processorSAMGInterface.H                  |  13 +-
 6 files changed, 249 insertions(+), 231 deletions(-)

diff --git a/src/foam/matrices/crMatrix/crAddressing.C b/src/foam/matrices/crMatrix/crAddressing.C
index 05c33839c..f7e2a81d8 100644
--- a/src/foam/matrices/crMatrix/crAddressing.C
+++ b/src/foam/matrices/crMatrix/crAddressing.C
@@ -36,28 +36,30 @@ Author
 
 // * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
-void Foam::crAddressing::setRowCount(const labelList& count)
+void Foam::crAddressing::setRowSizes(const labelList& rowSizes)
 {
-    if (count.size() != nRows_)
+    if (rowSizes.size() != nRows_)
     {
-        FatalErrorIn("void crAddressing::setRowCount(const labelList& count)")
-            << "Incorrect size of count: nRows =" << nRows_
-            << " count = " << count.size()
+        FatalErrorIn
+        (
+            "void crAddressing::setRowSizes(const labelList& rowSizes)"
+        )   << "Incorrect size of rowSizes: nRows =" << nRows_
+            << " rowSizes = " << rowSizes.size()
             << abort(FatalError);
 
     }
 
-    // Accumulate count
-    row_[0] = 0;
+    // Accumulate rowSizes
+    rowStart_[0] = 0;
 
-    forAll (count, i)
+    forAll (rowSizes, i)
     {
-        row_[i + 1] = row_[i] + count[i];
+        rowStart_[i + 1] = rowStart_[i] + rowSizes[i];
     }
 
     // Resize and clear column array
-    col_.setSize(row_[nRows_]);
-    col_ = 0;
+    column_.setSize(rowStart_[nRows_]);
+    column_ = 0;
 }
 
 
@@ -68,16 +70,16 @@ Foam::crAddressing::crAddressing
 (
     const label nRows,
     const label nCols,
-    const labelList& count
+    const labelList& rowSizes
 )
 :
     refCount(),
     nRows_(nRows),
     nCols_(nCols),
-    row_(nRows + 1),
-    col_(0)
+    rowStart_(nRows + 1),
+    column_(0)
 {
-    setRowCount(count);
+    setRowSizes(rowSizes);
 }
 
 
@@ -93,8 +95,8 @@ Foam::crAddressing::crAddressing
     refCount(),
     nRows_(nRows),
     nCols_(nCols),
-    row_(row),
-    col_(col)
+    rowStart_(row),
+    column_(col)
 {}
 
 
@@ -104,8 +106,8 @@ Foam::crAddressing::crAddressing(const crAddressing& a)
     refCount(),
     nRows_(a.nRows_),
     nCols_(a.nCols_),
-    row_(a.row_),
-    col_(a.col_)
+    rowStart_(a.rowStart_),
+    column_(a.column_)
 {}
 
 
@@ -115,8 +117,8 @@ Foam::crAddressing::crAddressing(Istream& is)
     refCount(),
     nRows_(readLabel(is)),
     nCols_(readLabel(is)),
-    row_(is),
-    col_(is)
+    rowStart_(is),
+    column_(is)
 {}
 
 
@@ -124,31 +126,34 @@ Foam::crAddressing::crAddressing(Istream& is)
 
 Foam::tmp<Foam::crAddressing> Foam::crAddressing::T() const
 {
-    const labelList& myRow = row();
-    const labelList& myCol = col();
+    const labelList& myRow = rowStart();
+    const labelList& myCol = column();
 
-    labelList trCount(nCols(), 0);
+    labelList trRowSizes(nCols(), 0);
 
     // Count number of entries in a row
     for (label i = 0; i < nRows(); i++)
     {
         for (label ip = myRow[i]; ip < myRow[i + 1]; ip++)
         {
-            trCount[myCol[ip]]++;
+            trRowSizes[myCol[ip]]++;
         }
     }
 
     // Create transpose addressing
-    tmp<crAddressing> ttranspose(new crAddressing(nCols(), nRows(), trCount));
+    tmp<crAddressing> ttranspose
+    (
+        new crAddressing(nCols(), nRows(), trRowSizes)
+    );
     crAddressing& transpose = ttranspose();
 
     // Set coefficients
-    const labelList& trRow = transpose.row();
-    labelList& trCol = transpose.col();
+    const labelList& trRow = transpose.rowStart();
+    labelList& trCol = transpose.column();
     trCol = 0;
 
-    // Reset count to use as counter
-    trCount = 0;
+    // Reset rowSizes to use as counter
+    trRowSizes = 0;
 
     label j;
 
@@ -158,9 +163,9 @@ Foam::tmp<Foam::crAddressing> Foam::crAddressing::T() const
         {
             j = myCol[ip];
 
-            trCol[trRow[j] + trCount[j]] = i;
+            trCol[trRow[j] + trRowSizes[j]] = i;
 
-            trCount[j]++;
+            trRowSizes[j]++;
         }
     }
 
@@ -184,8 +189,8 @@ void Foam::crAddressing::operator=(const crAddressing& rhs)
 
     nRows_ = rhs.nRows_;
     nCols_ = rhs.nCols_;
-    row_ = rhs.row_;
-    col_ = rhs.col_;
+    rowStart_ = rhs.rowStart_;
+    column_ = rhs.column_;
 }
 
 
@@ -194,8 +199,8 @@ void Foam::crAddressing::operator=(const crAddressing& rhs)
 Foam::Ostream& Foam::operator<<(Ostream& os, const crAddressing& a)
 {
     os  << a.nRows_ << tab << a.nCols_ << nl
-        << a.row_ << nl
-        << a.col_ << endl;
+        << a.rowStart_ << nl
+        << a.column_ << endl;
 
     return os;
 }
diff --git a/src/foam/matrices/crMatrix/crAddressing.H b/src/foam/matrices/crMatrix/crAddressing.H
index a95c62d33..517e3d57d 100644
--- a/src/foam/matrices/crMatrix/crAddressing.H
+++ b/src/foam/matrices/crMatrix/crAddressing.H
@@ -64,15 +64,15 @@ class crAddressing
 
         //- Row array.
         //  Provides start index for each row, dimensioned to nRows + 1
-        labelList row_;
+        labelList rowStart_;
 
-        //- Column array
-        labelList col_;
+        //- Column index array
+        labelList column_;
 
     // Private Member Functions
 
-        //- Set row count
-        void setRowCount(const labelList& count);
+        //- Set row sizes
+        void setRowSizes(const labelList& count);
 
 
 public:
@@ -84,7 +84,7 @@ public:
         (
             const label nRows,
             const label nCols,
-            const labelList& count
+            const labelList& nEntries
         );
 
         //- Construct from components
@@ -92,8 +92,8 @@ public:
         (
             const label nRows,
             const label nCols,
-            const labelList& row,
-            const labelList& col
+            const labelList& rowStart,
+            const labelList& column
         );
 
         //- Construct as copy
@@ -125,28 +125,28 @@ public:
             //- Return number of coefficients
             label nEntries() const
             {
-                return col_.size();
+                return column_.size();
             }
 
             //- Return row array
-            const labelList& row() const
+            const labelList& rowStart() const
             {
-                return row_;
+                return rowStart_;
             }
 
             //- Return column array
-            const labelList& col() const
+            const labelList& column() const
             {
-                return col_;
+                return column_;
             }
 
 
         // Edit
 
             //- Return column array
-            labelList& col()
+            labelList& column()
             {
-                return col_;
+                return column_;
             }
 
 
@@ -160,6 +160,7 @@ public:
 
         void operator=(const crAddressing&);
 
+
     // IOstream Operators
 
         friend Ostream& operator<<(Ostream&, const crAddressing&);
diff --git a/src/foam/matrices/crMatrix/crMatrix.C b/src/foam/matrices/crMatrix/crMatrix.C
index b26e3e4a9..942583999 100644
--- a/src/foam/matrices/crMatrix/crMatrix.C
+++ b/src/foam/matrices/crMatrix/crMatrix.C
@@ -109,8 +109,8 @@ Foam::tmp<Foam::crMatrix> Foam::crMatrix::T() const
 {
     // My addressing
     const label myNRows = crAddr().nRows();
-    const labelList& myRow = crAddr().row();
-    const labelList& myCol = crAddr().col();
+    const labelList& myRow = crAddr().rowStart();
+    const labelList& myCol = crAddr().column();
     const scalarField& myCoeffs = coeffs();
 
     // Create transpose
@@ -123,8 +123,8 @@ Foam::tmp<Foam::crMatrix> Foam::crMatrix::T() const
     tCoeffs = 0;
 
     // Transpose addressing
-    const labelList& tRow = transpose.crAddr().row();
-    const labelList& tCol = transpose.crAddr().col();
+    const labelList& tRow = transpose.crAddr().rowStart();
+    const labelList& tCol = transpose.crAddr().column();
 
     // Set transpose coefficients
 
@@ -153,8 +153,8 @@ Foam::tmp<Foam::crMatrix> Foam::crMatrix::T() const
 // Calculate b += A*x
 void Foam::crMatrix::dotPlus(scalarField& b, const scalarField& x) const
 {
-    const labelList& row = crAddr_.row();
-    const labelList& col = crAddr_.col();
+    const labelList& row = crAddr_.rowStart();
+    const labelList& col = crAddr_.column();
 
     forAll (b, i)
     {
diff --git a/src/foam/matrices/crMatrix/crMatrix.H b/src/foam/matrices/crMatrix/crMatrix.H
index d63025810..449bb5233 100644
--- a/src/foam/matrices/crMatrix/crMatrix.H
+++ b/src/foam/matrices/crMatrix/crMatrix.H
@@ -83,8 +83,8 @@ public:
         (
             const label nRows,
             const label nCols,
-            const labelList& row,
-            const labelList& col
+            const labelList& rowStart,
+            const labelList& column
         );
 
         //- Construct as copy
@@ -123,9 +123,9 @@ public:
             }
 
             //- Return column array to be set
-            labelList& col()
+            labelList& column()
             {
-                return crAddr_.col();
+                return crAddr_.column();
             }
 
 
diff --git a/src/foam/matrices/lduMatrix/solvers/AMG/interfaces/SAMGInterfaces/processorSAMGInterface/processorSAMGInterface.C b/src/foam/matrices/lduMatrix/solvers/AMG/interfaces/SAMGInterfaces/processorSAMGInterface/processorSAMGInterface.C
index 769e1e571..586c2200c 100644
--- a/src/foam/matrices/lduMatrix/solvers/AMG/interfaces/SAMGInterfaces/processorSAMGInterface/processorSAMGInterface.C
+++ b/src/foam/matrices/lduMatrix/solvers/AMG/interfaces/SAMGInterfaces/processorSAMGInterface/processorSAMGInterface.C
@@ -45,210 +45,215 @@ namespace Foam
 Foam::processorSAMGInterface::processorSAMGInterface
 (
     const lduPrimitiveMesh& lduMesh,
+    const crMatrix& prolongation,
     const lduInterfacePtrsList& coarseInterfaces,
     const lduInterface& fineInterface,
-    const labelField& localRestrictAddressing,
-    const labelField& neighbourRestrictAddressing
+    const labelField& localRowLabel,
+    const labelField& neighbourRowLabel
 )
 :
-    SAMGInterface(lduMesh),
+    SAMGInterface(lduMesh, prolongation),
     fineProcInterface_(refCast<const processorLduInterface>(fineInterface)),
     comm_(fineProcInterface_.comm()),
     tag_(fineProcInterface_.tag())
 {
     Pout<< "Creating processor SAMG interface" << endl;
-    /* HJ, Code missing here
 
-    // Make a lookup table of entries for owner/neighbour
-    HashTable<SLList<label>, label, Hash<label> > neighboursTable
+    // Analyse the local and neighbour row label:
+    //  local coarse, remote coarse = regular coarse face
+    //  local coarse, remote fine = local expanded face: receive prolonged data
+    //  local fine, remote coarse = neighbour expanded face: send prolonged data
+
+    // Algorithm
+    // Go through local row labels and examine cases
+    // 1) coarse local and coarse remote:
+    //    create coarse processor face and set faceCells.  Set weight to 1
+    // 2) coarse local and fine remote:
+    //    will receive coarse neighbours and weights from opposite side
+    // 3) fine local and coarse remote:
+    //    assemble local coarse neighbours and weights from the prolongation
+    // 4) fine local and fine remote - ignore
+    //
+    // On completion of selection:
+    //    send and receive local coarse neighbours for fine local/coarse remote
+    //    sort coarse equations by increasing coarse index from master side
+    //    create faceCells, fineAddressing and fineWeights
+
+    // First collect and communicate internal neighbours from the local fine
+    // side (ie neighbour processor cell is coarse)
+    HashTable<labelList, label, Hash<label> > neighboursFromLocalFine
     (
-        localRestrictAddressing.size()
+        Foam::max(128, fineProcInterface_.interfaceSize()/4)
     );
 
-    // Table of face-sets to be agglomerated
-    HashTable<SLList<SLList<label> >, label, Hash<label> > faceFaceTable
+    HashTable<scalarField, label, Hash<label> > weightsFromLocalFine
     (
-        localRestrictAddressing.size()
+        Foam::max(128, fineProcInterface_.interfaceSize()/4)
     );
 
+    // Get access to the prolongation addressing and coefficients
+    const labelList& pRowStart = prolongation.crAddr().rowStart();
+    const labelList& pColumn = prolongation.crAddr().column();
+    const scalarField& pCoeffs = prolongation.coeffs();
+
+    // Get fine faceCells
+    const labelList& fineFaceCells = fineInterface.faceCells();
+    Pout<< "fineFaceCells: " << fineFaceCells << endl;
+    // Collect local fine to neighbour coarse connections for communication
+    forAll (localRowLabel, faceI)
+    {
+        if
+        (
+            localRowLabel[faceI] < 0
+         && neighbourRowLabel[faceI] >= 0
+        )
+        {
+            // Found local fine to neighbour coarse interface
+
+            // Collect local coarse neighbours and weights from the
+            // prolongation matrix to send to other processor
+            const label curStart = pRowStart[fineFaceCells[faceI]];
+            const label curEnd = pRowStart[fineFaceCells[faceI] + 1];
+            const label nCoarse = curEnd - curStart;
+            Pout<< "Eqn: " << fineFaceCells[faceI] << " Span: " << curStart << " " << curEnd << " = " << nCoarse << endl;
+            labelList nbrs(nCoarse);
+            scalarField weights(nCoarse);
+
+            forAll (nbrs, i)
+            {
+                nbrs[i] = pColumn[curStart + i];
+                weights[i] = pCoeffs[curStart + i];
+            }
+            Pout<< "weights: " << weights << endl;
+            // Insert neighbours under remote coarse index
+            neighboursFromLocalFine.insert(neighbourRowLabel[faceI], nbrs);
+            weightsFromLocalFine.insert(neighbourRowLabel[faceI], weights);
+        }
+    }
+
+    // Receive remote prolongation data
+    HashTable<labelList, label, Hash<label> > neighboursFromRemoteFine;
+    HashTable<scalarField, label, Hash<label> > weightsFromRemoteFine;
+
+    // Send and receive the addressing from the other side
+    {
+        OPstream toNbr(Pstream::blocking, neighbProcNo());
+        toNbr<< neighboursFromLocalFine << weightsFromLocalFine;
+    }
+
+    {
+        IPstream fromNbr(Pstream::blocking, neighbProcNo());
+
+        neighboursFromRemoteFine =
+            HashTable<labelList, label, Hash<label> >(fromNbr);
+
+        weightsFromRemoteFine =
+            HashTable<scalarField, label, Hash<label> >(fromNbr);
+    }
+
+    // Assemble connectivity
+
+    // Resize arrays to size of fine interface
+    // Note: it is technically possible to have MORE coarse processor faces
+    // so a check will be made in the end
+    faceCells_.setSize(5*fineProcInterface_.interfaceSize());
+    fineAddressing_.setSize(5*fineProcInterface_.interfaceSize());
+    fineWeights_.setSize(5*fineProcInterface_.interfaceSize());
+
+    // Count coarse faces
     label nCoarseFaces = 0;
 
-    forAll (localRestrictAddressing, ffi)
+    // Collect coarse-to-fine connections
+    forAll (localRowLabel, faceI)
     {
-        label curMaster = -1;
-        label curSlave = -1;
-
-        // Do switching on master/slave indexes based on the owner/neighbour of
-        // the processor index such that both sides get the same answer.
-        if (myProcNo() < neighbProcNo())
+        if
+        (
+            localRowLabel[faceI] >= 0
+         && neighbourRowLabel[faceI] >= 0
+        )
         {
-            // Master side
-            curMaster = localRestrictAddressing[ffi];
-            curSlave = neighbourRestrictAddressing[ffi];
-        }
-        else
-        {
-            // Slave side
-            curMaster = neighbourRestrictAddressing[ffi];
-            curSlave = localRestrictAddressing[ffi];
-        }
-
-        // Look for the master cell.  If it has already got a face,
-        // add the coefficient to the face.  If not, create a new face.
-        if (neighboursTable.found(curMaster))
-        {
-            // Check all current neighbours to see if the current slave already
-            // exists and if so, add the fine face to the agglomeration.
-
-            SLList<label>& curNbrs = neighboursTable.find(curMaster)();
-
-            SLList<SLList<label> >& curFaceFaces =
-                faceFaceTable.find(curMaster)();
-
-            bool nbrFound = false;
-
-            SLList<label>::iterator nbrsIter = curNbrs.begin();
-
-            SLList<SLList<label> >::iterator faceFacesIter =
-                curFaceFaces.begin();
-
-            for
-            (
-                ;
-                nbrsIter != curNbrs.end(), faceFacesIter != curFaceFaces.end();
-                ++nbrsIter, ++faceFacesIter
-            )
-            {
-                if (nbrsIter() == curSlave)
-                {
-                    nbrFound = true;
-                    faceFacesIter().append(ffi);
-                    break;
-                }
-            }
-
-            if (!nbrFound)
-            {
-                curNbrs.append(curSlave);
-                curFaceFaces.append(SLList<label>(ffi));
-
-                // New coarse face created
-                nCoarseFaces++;
-            }
-        }
-        else
-        {
-            // This master has got no neighbours yet.  Add a neighbour
-            // and a coefficient, thus creating a new face
-            neighboursTable.insert(curMaster, SLList<label>(curSlave));
-            faceFaceTable.insert
-            (
-                curMaster,
-                SLList<SLList<label> >(SLList<label>(ffi))
-            );
-
-            // New coarse face created
+            // Found local coarse to neighbour coarse face
+            Pout<< "face " << faceI << " CC" << endl;
+            // Create new coarse face
+            faceCells_[nCoarseFaces] = localRowLabel[faceI];
+            fineAddressing_[nCoarseFaces] = faceI;
+            fineWeights_[nCoarseFaces] = 1;
             nCoarseFaces++;
         }
-    } // end for all fine faces
-
-
-    faceCells_.setSize(nCoarseFaces, -1);
-    fineAddressing_.setSize(localRestrictAddressing.size(), -1);
-    restrictAddressing_.setSize(localRestrictAddressing.size(), -1);
-
-    // All weights are equal to 1: integral matching
-    restrictWeights_.setSize(localRestrictAddressing.size(), 1.0);
-
-    labelList contents = neighboursTable.toc();
-
-    // Sort makes sure the order is identical on both sides.
-    // HJ, 20/Feb.2009
-    sort(contents);
-
-    // Reset face counter for re-use
-    nCoarseFaces = 0;
-
-    if (myProcNo() < neighbProcNo())
-    {
-        // On master side, the owner addressing is stored in table of contents
-        forAll (contents, masterI)
+        else if
+        (
+            localRowLabel[faceI] < 0
+         && neighbourRowLabel[faceI] >= 0
+        )
         {
-            SLList<label>& curNbrs = neighboursTable.find(contents[masterI])();
+            // Found local fine to neighbour coarse face
 
-            SLList<SLList<label> >& curFaceFaces =
-                faceFaceTable.find(contents[masterI])();
+            // Pick up local prolongation coarse entries and for all
+            // add a new face with appropriate weight
+            // Note: faceCells changes due to (internal) local coarse cells
+            const labelList& curLocalCoarseNbrs =
+                neighboursFromLocalFine[neighbourRowLabel[faceI]];
 
-            SLList<label>::iterator nbrsIter = curNbrs.begin();
-
-            SLList<SLList<label> >::iterator faceFacesIter =
-                curFaceFaces.begin();
-
-            for
-            (
-                ;
-                nbrsIter != curNbrs.end(), faceFacesIter != curFaceFaces.end();
-                ++nbrsIter, ++faceFacesIter
-            )
+            const scalarField& curLocalCoarseWeights =
+                weightsFromLocalFine[neighbourRowLabel[faceI]];
+            Pout<< "face " << faceI << " FC, size: " << curLocalCoarseNbrs.size()
+                << " W: " << curLocalCoarseWeights << endl;
+            forAll (curLocalCoarseNbrs, curNbrI)
             {
-                faceCells_[nCoarseFaces] = contents[masterI];
-
-                for
-                (
-                    SLList<label>::iterator facesIter =
-                        faceFacesIter().begin();
-                    facesIter != faceFacesIter().end();
-                    ++facesIter
-                )
-                {
-                    fineAddressing_[facesIter()] = facesIter();
-                    restrictAddressing_[facesIter()] = nCoarseFaces;
-                }
-
+                // Create new coarse face
+                faceCells_[nCoarseFaces] = curLocalCoarseNbrs[curNbrI];
+                fineAddressing_[nCoarseFaces] = faceI;
+                fineWeights_[nCoarseFaces] = curLocalCoarseWeights[curNbrI];
                 nCoarseFaces++;
             }
         }
-    }
-    else
-    {
-        // On slave side, the owner addressing is stored in linked lists
-        forAll (contents, masterI)
+        else if
+        (
+            localRowLabel[faceI] >= 0
+         && neighbourRowLabel[faceI] < 0
+        )
         {
-            SLList<label>& curNbrs = neighboursTable.find(contents[masterI])();
+            // Found local coarse to neighbour fine face
 
-            SLList<SLList<label> >& curFaceFaces =
-                faceFaceTable.find(contents[masterI])();
+            // Pick up neighbour prolongation coarse entries and for all
+            // add a new face with appropriate weight
+            // Note: faceCells remains the same: single local coarse cell
+            const labelList& curNbrCoarseNbrs =
+                neighboursFromRemoteFine[localRowLabel[faceI]];
 
-            SLList<label>::iterator nbrsIter = curNbrs.begin();
-
-            SLList<SLList<label> >::iterator faceFacesIter =
-                curFaceFaces.begin();
-
-            for
-            (
-                ;
-                nbrsIter != curNbrs.end(), faceFacesIter != curFaceFaces.end();
-                ++nbrsIter, ++faceFacesIter
-            )
+            const scalarField& curNbrCoarseWeights =
+                weightsFromRemoteFine[localRowLabel[faceI]];
+            Pout<< "face " << faceI << " CF, size: " << curNbrCoarseNbrs.size()
+                << " W: " << curNbrCoarseWeights << endl;
+            forAll (curNbrCoarseNbrs, curNbrI)
             {
-                faceCells_[nCoarseFaces] = nbrsIter();
-
-                for
-                (
-                    SLList<label>::iterator facesIter = faceFacesIter().begin();
-                    facesIter != faceFacesIter().end();
-                    ++facesIter
-                )
-                {
-                    fineAddressing_[facesIter()] = facesIter();
-                    restrictAddressing_[facesIter()] = nCoarseFaces;
-                }
-
+                // Create new coarse face
+                faceCells_[nCoarseFaces] = localRowLabel[faceI];
+                fineAddressing_[nCoarseFaces] = faceI;
+                fineWeights_[nCoarseFaces] = curNbrCoarseWeights[curNbrI];
                 nCoarseFaces++;
             }
         }
+        else
+        {
+            // Fine to fine.  Ignore
+        }
     }
-    */
+
+    // Check for fixed lists
+    if (nCoarseFaces > 5*fineProcInterface_.interfaceSize())
+    {
+        FatalErrorIn("processorSAMGInterface::processorSAMGInterface(...)")
+            << "Coarse SAMG processor siginificantly bigger than fine: "
+            << "nCoarseFaces = " << nCoarseFaces
+            << " nFineFaces = " << fineProcInterface_.interfaceSize()
+            << abort(FatalError);
+    }
+    Pout<< "nCoarseFaces: " << nCoarseFaces << endl;
+    // Resize arrays to final size
+    faceCells_.setSize(nCoarseFaces);
+    fineAddressing_.setSize(nCoarseFaces);
+    fineWeights_.setSize(nCoarseFaces);
 }
 
 
diff --git a/src/foam/matrices/lduMatrix/solvers/AMG/interfaces/SAMGInterfaces/processorSAMGInterface/processorSAMGInterface.H b/src/foam/matrices/lduMatrix/solvers/AMG/interfaces/SAMGInterfaces/processorSAMGInterface/processorSAMGInterface.H
index 2b82f3030..5de86d5aa 100644
--- a/src/foam/matrices/lduMatrix/solvers/AMG/interfaces/SAMGInterfaces/processorSAMGInterface/processorSAMGInterface.H
+++ b/src/foam/matrices/lduMatrix/solvers/AMG/interfaces/SAMGInterfaces/processorSAMGInterface/processorSAMGInterface.H
@@ -83,14 +83,15 @@ public:
     // Constructors
 
         //- Construct from fine-level interface,
-        //  local and neighbour restrict addressing
+        //  local and neighbour row label
         processorSAMGInterface
         (
             const lduPrimitiveMesh& lduMesh,
+            const crMatrix& prolongation,
             const lduInterfacePtrsList& coarseInterfaces,
             const lduInterface& fineInterface,
-            const labelField& localRestrictAddressing,
-            const labelField& neighbourRestrictAddressing
+            const labelField& localRowLabel,
+            const labelField& neighbourRowLabel
         );
 
 
@@ -102,6 +103,12 @@ public:
 
         // Access
 
+            //- Return interface size
+            virtual label interfaceSize() const
+            {
+                return SAMGInterface::size();
+            }
+
             //- Return true if interface is coupled
             virtual bool coupled() const
             {