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https://github.com/paboyle/Grid.git
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401 lines
14 KiB
C++
401 lines
14 KiB
C++
#ifndef GRID_CARTESIAN_H
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#define GRID_CARTESIAN_H
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#include <Grid.h>
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#include <Grid_communicator.h>
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namespace Grid{
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/////////////////////////////////////////////////////////////////////////////////////////
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// Grid Support.
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/////////////////////////////////////////////////////////////////////////////////////////
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class GridBase : public CartesianCommunicator {
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public:
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// Give Lattice access
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template<class object> friend class Lattice;
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GridBase(std::vector<int> & processor_grid) : CartesianCommunicator(processor_grid) {};
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//FIXME
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// protected:
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// Lattice wide random support. not yet fully implemented. Need seed strategy
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// and one generator per site.
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// std::default_random_engine generator;
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// static std::mt19937 generator( 9 );
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//////////////////////////////////////////////////////////////////////
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// Commicator provides information on the processor grid
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//////////////////////////////////////////////////////////////////////
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// unsigned long _ndimension;
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// std::vector<int> _processors; // processor grid
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// int _processor; // linear processor rank
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// std::vector<int> _processor_coor; // linear processor rank
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//////////////////////////////////////////////////////////////////////
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// Physics Grid information.
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std::vector<int> _simd_layout; // Which dimensions get relayed out over simd lanes.
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std::vector<int> _fdimensions;// Global dimensions of array prior to cb removal
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std::vector<int> _gdimensions;// Global dimensions of array after cb removal
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std::vector<int> _ldimensions;// local dimensions of array with processor images removed
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std::vector<int> _rdimensions;// Reduced local dimensions with simd lane images and processor images removed
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std::vector<int> _ostride; // Outer stride for each dimension
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std::vector<int> _istride; // Inner stride i.e. within simd lane
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int _osites; // _isites*_osites = product(dimensions).
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int _isites;
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std::vector<int> _slice_block; // subslice information
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std::vector<int> _slice_stride;
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std::vector<int> _slice_nblock;
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// Might need these at some point
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// std::vector<int> _lstart; // local start of array in gcoors. _processor_coor[d]*_ldimensions[d]
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// std::vector<int> _lend; // local end of array in gcoors _processor_coor[d]*_ldimensions[d]+_ldimensions_[d]-1
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public:
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////////////////////////////////////////////////////////////////
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// Checkerboarding interface is virtual and overridden by
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// GridCartesian / GridRedBlackCartesian
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////////////////////////////////////////////////////////////////
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virtual int CheckerBoarded(int dim)=0;
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virtual int CheckerBoard(std::vector<int> site)=0;
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virtual int CheckerBoardDestination(int source_cb,int shift)=0;
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virtual int CheckerBoardShift(int source_cb,int dim,int shift,int osite)=0;
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inline int CheckerBoardFromOindex (int Oindex){
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std::vector<int> ocoor;
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oCoorFromOindex(ocoor,Oindex);
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int ss=0;
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for(int d=0;d<_ndimension;d++){
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ss=ss+ocoor[d];
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}
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return ss&0x1;
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}
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//////////////////////////////////////////////////////////////////////////////////////////////
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// Local layout calculations
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//////////////////////////////////////////////////////////////////////////////////////////////
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// These routines are key. Subdivide the linearised cartesian index into
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// "inner" index identifying which simd lane of object<vFcomplex> is associated with coord
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// "outer" index identifying which element of _odata in class "Lattice" is associated with coord.
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//
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// Compared to, say, Blitz++ we simply need to store BOTH an inner stride and an outer
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// stride per dimension. The cost of evaluating the indexing information is doubled for an n-dimensional
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// coordinate. Note, however, for data parallel operations the "inner" indexing cost is not paid and all
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// lanes are operated upon simultaneously.
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virtual int oIndex(std::vector<int> &coor)
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{
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int idx=0;
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// Works with either global or local coordinates
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for(int d=0;d<_ndimension;d++) idx+=_ostride[d]*(coor[d]%_rdimensions[d]);
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return idx;
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}
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inline int oIndexReduced(std::vector<int> &ocoor)
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{
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int idx=0;
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// ocoor is already reduced so can eliminate the modulo operation
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// for fast indexing and inline the routine
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for(int d=0;d<_ndimension;d++) idx+=_ostride[d]*ocoor[d];
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return idx;
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}
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inline void oCoorFromOindex (std::vector<int>& coor,int Oindex){
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coor.resize(_ndimension);
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for(int d=0;d<_ndimension;d++){
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coor[d] = Oindex % _rdimensions[d];
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Oindex = Oindex / _rdimensions[d];
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}
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}
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//////////////////////////////////////////////////////////
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// SIMD lane addressing
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//////////////////////////////////////////////////////////
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inline int iIndex(std::vector<int> &lcoor)
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{
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int idx=0;
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for(int d=0;d<_ndimension;d++) idx+=_istride[d]*(lcoor[d]/_rdimensions[d]);
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return idx;
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}
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inline void iCoorFromIindex(std::vector<int> &coor,int lane)
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{
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coor.resize(_ndimension);
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for(int d=0;d<_ndimension;d++){
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coor[d] = lane % _simd_layout[d];
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lane = lane / _simd_layout[d];
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}
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}
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inline int PermuteDim(int dimension){
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return _simd_layout[dimension]>1;
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}
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inline int PermuteType(int dimension){
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int permute_type=0;
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for(int d=_ndimension-1;d>dimension;d--){
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if (_simd_layout[d]>1 ) permute_type++;
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}
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return permute_type;
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}
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////////////////////////////////////////////////////////////////
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// Array sizing queries
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////////////////////////////////////////////////////////////////
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inline int iSites(void) { return _isites; };
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inline int Nsimd(void) { return _isites; };// Synonymous with iSites
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inline int oSites(void) { return _osites; };
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inline int lSites(void) { return _isites*_osites; };
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inline int gSites(void) { return _isites*_osites*_Nprocessors; };
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inline int Nd (void) { return _ndimension;};
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inline const std::vector<int> &FullDimensions(void) { return _fdimensions;};
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inline const std::vector<int> &GlobalDimensions(void) { return _gdimensions;};
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inline const std::vector<int> &LocalDimensions(void) { return _ldimensions;};
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inline const std::vector<int> &VirtualLocalDimensions(void) { return _ldimensions;};
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////////////////////////////////////////////////////////////////
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// Global addressing
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////////////////////////////////////////////////////////////////
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void RankIndexToGlobalCoor(int rank, int o_idx, int i_idx , std::vector<int> &gcoor)
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{
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gcoor.resize(_ndimension);
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std::vector<int> coor(_ndimension);
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ProcessorCoorFromRank(rank,coor);
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for(int mu=0;mu<_ndimension;mu++) gcoor[mu] = _ldimensions[mu]&coor[mu];
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iCoorFromIindex(coor,i_idx);
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for(int mu=0;mu<_ndimension;mu++) gcoor[mu] += _rdimensions[mu]&coor[mu];
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oCoorFromOindex (coor,o_idx);
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for(int mu=0;mu<_ndimension;mu++) gcoor[mu] += coor[mu];
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}
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void RankIndexCbToFullGlobalCoor(int rank, int o_idx, int i_idx, int cb,std::vector<int> &fcoor)
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{
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RankIndexToGlobalCoor(rank,o_idx,i_idx ,fcoor);
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if(CheckerBoarded(0)){
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fcoor[0] = fcoor[0]*2+cb;
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}
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}
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void ProcessorCoorLocalCoorToGlobalCoor(std::vector<int> &Pcoor,std::vector<int> &Lcoor,std::vector<int> &gcoor)
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{
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gcoor.resize(_ndimension);
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for(int mu=0;mu<_ndimension;mu++) gcoor[mu] = Pcoor[mu]*_ldimensions[mu]+Lcoor[mu];
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}
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void GlobalCoorToProcessorCoorLocalCoor(std::vector<int> &pcoor,std::vector<int> &lcoor,const std::vector<int> &gcoor)
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{
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pcoor.resize(_ndimension);
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lcoor.resize(_ndimension);
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for(int mu=0;mu<_ndimension;mu++){
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pcoor[mu] = gcoor[mu]/_ldimensions[mu];
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lcoor[mu] = gcoor[mu]%_ldimensions[mu];
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}
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}
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void GlobalCoorToRankIndex(int &rank, int &o_idx, int &i_idx ,const std::vector<int> &gcoor)
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{
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std::vector<int> pcoor;
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std::vector<int> lcoor;
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GlobalCoorToProcessorCoorLocalCoor(pcoor,lcoor,gcoor);
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rank = RankFromProcessorCoor(pcoor);
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i_idx= iIndex(lcoor);
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o_idx= oIndex(lcoor);
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}
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};
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class GridCartesian: public GridBase {
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public:
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virtual int CheckerBoarded(int dim){
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return 0;
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}
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virtual int CheckerBoard(std::vector<int> site){
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return 0;
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}
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virtual int CheckerBoardDestination(int cb,int shift){
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return 0;
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}
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virtual int CheckerBoardShift(int source_cb,int dim,int shift, int osite){
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return shift;
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}
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GridCartesian(std::vector<int> &dimensions,
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std::vector<int> &simd_layout,
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std::vector<int> &processor_grid
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) : GridBase(processor_grid)
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{
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///////////////////////
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// Grid information
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///////////////////////
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_ndimension = dimensions.size();
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_fdimensions.resize(_ndimension);
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_gdimensions.resize(_ndimension);
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_ldimensions.resize(_ndimension);
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_rdimensions.resize(_ndimension);
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_simd_layout.resize(_ndimension);
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_ostride.resize(_ndimension);
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_istride.resize(_ndimension);
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_osites = 1;
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_isites = 1;
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for(int d=0;d<_ndimension;d++){
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_fdimensions[d] = dimensions[d]; // Global dimensions
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_gdimensions[d] = _fdimensions[d]; // Global dimensions
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_simd_layout[d] = simd_layout[d];
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//FIXME check for exact division
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// Use a reduced simd grid
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_ldimensions[d]= _gdimensions[d]/_processors[d]; //local dimensions
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_rdimensions[d]= _ldimensions[d]/_simd_layout[d]; //overdecomposition
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_osites *= _rdimensions[d];
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_isites *= _simd_layout[d];
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// Addressing support
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if ( d==0 ) {
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_ostride[d] = 1;
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_istride[d] = 1;
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} else {
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_ostride[d] = _ostride[d-1]*_rdimensions[d-1];
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_istride[d] = _istride[d-1]*_simd_layout[d-1];
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}
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}
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///////////////////////
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// subplane information
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///////////////////////
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_slice_block.resize(_ndimension);
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_slice_stride.resize(_ndimension);
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_slice_nblock.resize(_ndimension);
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int block =1;
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int nblock=1;
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for(int d=0;d<_ndimension;d++) nblock*=_rdimensions[d];
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for(int d=0;d<_ndimension;d++){
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nblock/=_rdimensions[d];
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_slice_block[d] =block;
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_slice_stride[d]=_ostride[d]*_rdimensions[d];
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_slice_nblock[d]=nblock;
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block = block*_rdimensions[d];
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}
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};
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};
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// Specialise this for red black grids storing half the data like a chess board.
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class GridRedBlackCartesian : public GridBase
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{
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public:
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virtual int CheckerBoarded(int dim){
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if( dim==0) return 1;
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else return 0;
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}
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virtual int CheckerBoard(std::vector<int> site){
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return (site[0]+site[1]+site[2]+site[3])&0x1;
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}
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// Depending on the cb of site, we toggle source cb.
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// for block #b, element #e = (b, e)
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// we need
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virtual int CheckerBoardShift(int source_cb,int dim,int shift,int osite){
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if(dim != 0) return shift;
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int fulldim =_fdimensions[0];
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shift = (shift+fulldim)%fulldim;
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// Probably faster with table lookup;
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// or by looping over x,y,z and multiply rather than computing checkerboard.
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int ocb=CheckerBoardFromOindex(osite);
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if ( (source_cb+ocb)&1 ) {
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return (shift)/2;
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} else {
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return (shift+1)/2;
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}
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}
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virtual int CheckerBoardDestination(int source_cb,int shift){
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if ((shift+_fdimensions[0])&0x1) {
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return 1-source_cb;
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} else {
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return source_cb;
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}
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};
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GridRedBlackCartesian(std::vector<int> &dimensions,
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std::vector<int> &simd_layout,
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std::vector<int> &processor_grid) : GridBase(processor_grid)
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{
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///////////////////////
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// Grid information
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///////////////////////
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_ndimension = dimensions.size();
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_fdimensions.resize(_ndimension);
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_gdimensions.resize(_ndimension);
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_ldimensions.resize(_ndimension);
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_rdimensions.resize(_ndimension);
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_simd_layout.resize(_ndimension);
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_ostride.resize(_ndimension);
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_istride.resize(_ndimension);
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_osites = 1;
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_isites = 1;
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for(int d=0;d<_ndimension;d++){
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_fdimensions[d] = dimensions[d];
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_gdimensions[d] = _fdimensions[d];
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if (d==0) _gdimensions[0] = _gdimensions[0]/2; // Remove a checkerboard
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_ldimensions[d] = _gdimensions[d]/_processors[d];
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// Use a reduced simd grid
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_simd_layout[d] = simd_layout[d];
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_rdimensions[d]= _ldimensions[d]/_simd_layout[d];
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_osites *= _rdimensions[d];
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_isites *= _simd_layout[d];
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// Addressing support
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if ( d==0 ) {
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_ostride[d] = 1;
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_istride[d] = 1;
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} else {
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_ostride[d] = _ostride[d-1]*_rdimensions[d-1];
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_istride[d] = _istride[d-1]*_simd_layout[d-1];
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}
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}
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////////////////////////////////////////////////////////////////////////////////////////////
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// subplane information
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////////////////////////////////////////////////////////////////////////////////////////////
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_slice_block.resize(_ndimension);
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_slice_stride.resize(_ndimension);
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_slice_nblock.resize(_ndimension);
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int block =1;
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int nblock=1;
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for(int d=0;d<_ndimension;d++) nblock*=_rdimensions[d];
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for(int d=0;d<_ndimension;d++){
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nblock/=_rdimensions[d];
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_slice_block[d] =block;
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_slice_stride[d]=_ostride[d]*_rdimensions[d];
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_slice_nblock[d]=nblock;
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block = block*_rdimensions[d];
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}
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};
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protected:
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virtual int oIndex(std::vector<int> &coor)
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{
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int idx=_ostride[0]*((coor[0]/2)%_rdimensions[0]);
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for(int d=1;d<_ndimension;d++) idx+=_ostride[d]*(coor[d]%_rdimensions[d]);
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return idx;
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};
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};
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}
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#endif
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