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#pragma once
#include <algorithm>
#include <array>
#include <cstddef>
#include <fstream>
#include <iostream>
#include <mpi.h>
#include <string>
#include <tuple>
#include <vector>
#include "gsl/multi_span"
#include "gsl/span"
#include "MpiEnvironment.hpp"
#include "state.hpp"
struct Size {
std::size_t Cols{};
std::size_t Rows{};
};
struct Coord {
int X{};
int Y{};
};
class MpiWireworld {
const MpiEnvironment& _env;
Size _tileSize;
std::vector<State> _memoryA;
std::vector<State> _memoryB;
gsl::multi_span<State, -1, -1> _model;
gsl::multi_span<State, -1, -1> _nextModel;
// begin IO functions
static auto ReadHeader(std::istream& input) {
std::size_t noCols{};
std::size_t noRows{};
input >> noCols >> noRows;
if (noCols < 1 || noRows < 1)
throw std::logic_error("File header corrupt");
std::string dummy; // skip line break
std::getline(input, dummy);
const auto& headerSize = input.tellg();
return Size{noCols, noRows};
}
static auto GetTileSize(Size globalSize, Size gridSize) {
const auto& tileSizeCols = globalSize.Cols / gridSize.Cols;
const auto& tileSizeRows = globalSize.Rows / gridSize.Rows;
return Size{tileSizeCols, tileSizeRows};
}
static void StridedRead(std::istream& input, std::size_t inputChunkLength,
std::size_t count, std::size_t inputStride,
gsl::span<State> buf, std::size_t bufStride) {
std::size_t writeOffset{0};
for (size_t i{0}; i < count; ++i) {
input.read(reinterpret_cast<char*>(buf.data()) + writeOffset,
inputChunkLength);
input.seekg(inputStride - inputChunkLength, std::ios::cur);
writeOffset += bufStride;
}
}
static void ReadTiles(std::istream& input, Size srcSize, Size gridSize,
std::size_t rank, gsl::span<State> buf,
std::size_t bufStride) {
constexpr auto LF = 1; // linefeed chars
const auto& tileSize = GetTileSize(srcSize, gridSize);
const auto& tileX = rank % gridSize.Cols;
const auto& tileY = rank / gridSize.Cols;
// seek to the begin of the tile
const auto& displacement =
(srcSize.Cols + LF) * (tileSize.Rows * tileY) +
(tileSize.Cols * tileX);
input.seekg(displacement, std::ios::cur);
const auto& tileStride = srcSize.Cols + LF;
StridedRead(input, tileSize.Cols, tileSize.Rows, tileStride, buf,
bufStride);
}
void ReadFile(const std::string& path, Size gridSize) {
std::ifstream input(path);
const auto& globalSize = ReadHeader(input);
_tileSize = GetTileSize(globalSize, gridSize);
_memoryA.resize((_tileSize.Cols + 2) * (_tileSize.Rows + 2));
_memoryB.resize((_tileSize.Cols + 2) * (_tileSize.Rows + 2));
_model =
gsl::as_multi_span(_memoryA.data(), gsl::dim(_tileSize.Rows + 2),
gsl::dim(_tileSize.Cols + 2));
_nextModel =
gsl::as_multi_span(_memoryB.data(), gsl::dim(_tileSize.Rows + 2),
gsl::dim(_tileSize.Cols + 2));
ReadTiles(input, globalSize, gridSize, _env.worldRank(),
gsl::span<State>(_memoryA.data() + _tileSize.Cols + 2 + 1,
_memoryA.size() - 1),
_tileSize.Cols + 2);
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/*
// Trying to acomplish this with MPI
// if (env.isMaster()) {
// std::cout << "noCols: " << _noCols << '\n';
// std::cout << "noRows: " << _noRows << '\n';
//}
// const auto& noDims = 2;
// const auto& gsizes = std::array<int, 2>{
// _noCols + 1, //
// _noRows, //
//};
// const auto& distribs = std::array<int, 2>{
// MPI_DISTRIBUTE_BLOCK, //
// MPI_DISTRIBUTE_BLOCK //
//};
// const auto& dargs = std::array<int, 2>{
// MPI_DISTRIBUTE_DFLT_DARG, //
// MPI_DISTRIBUTE_DFLT_DARG //
//};
// const auto& psizes = std::array<int, 2>{
// 2, //
// 4 //
//};
//// const auto& noDims = 1;
//// const auto& gsizes = std::array<int, 1>{_noCols};
//// const auto& distribs = std::array<int, 1>{MPI_DISTRIBUTE_BLOCK};
//// const auto& dargs = std::array<int, 1>{MPI_DISTRIBUTE_DFLT_DARG};
//// const auto& psizes = std::array<int, 1>{8};
////MPI_Datatatype tiletype;
////int global_sizes[2] = { _noCols + 1, _noRows };
////int tile_sizes[2] = { 10, 5 };
////int tile_start[2] = { }
////MPI_Type_create_subarray(2, global_sizes, tile_sizes, )
// MPI_Datatype tiletype;
////MPI_Datatype linetype;
////MPI_Datatype linetype_ext;
////MPI_Type_contiguous(_noCols, MPI_CHAR, &linetype);
////MPI_Type_create_resized(linetype, 0, _noCols + 1, &linetype_ext);
////MPI_Type_commit(&linetype_ext);
////MPI_Type_free(&linetype);
//
// MPI_Type_create_darray(env.worldSize(), env.worldRank(), noDims,
// gsizes.data(), distribs.data(), dargs.data(),
// psizes.data(), MPI_ORDER_C, MPI_CHAR,
// &tiletype);
// MPI_Type_commit(&tiletype);
// int tiletypeSize;
// MPI_Type_size(tiletype, &tiletypeSize);
// if (env.isMaster())
// std::cout << "tiletypeSize: " << tiletypeSize << '\n';
// MPI_File fh;
// MPI_File_open(MPI_COMM_WORLD, path.c_str(), MPI_MODE_RDONLY,
// MPI_INFO_NULL, &fh);
// MPI_File_set_view(fh, _headerSize, MPI_CHAR, MPI_CHAR, "native",
// MPI_INFO_NULL);
// const auto& typeCols = 10; // how to get those?
// const auto& typeRows = 5;
MPI_File_read_all(fh, buf.data(), 1, tiletype, MPI_STATUS_IGNORE);
MPI_File_close(&fh);
std::replace(std::begin(buf), std::end(buf), '\n', 'L');
*/
}
// end IO functions
public:
MpiWireworld(const MpiEnvironment& env, const std::string& path)
: _env(env) {
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const auto& gridSize = Size{/*Cols*/ 4, /*Rows*/ 2}; // TODO: calc these
ReadFile(path, gridSize);
// types begin
MPI_Datatype haloRowType;
MPI_Type_contiguous(_tileSize.Cols, MPI_CHAR, &haloRowType);
MPI_Type_commit(&haloRowType);
MPI_Datatype haloColumnType;
MPI_Type_vector(_tileSize.Rows, 1, _tileSize.Cols + 2, MPI_CHAR,
&haloColumnType);
MPI_Type_commit(&haloColumnType);
MPI_Datatype haloCornerType = MPI_CHAR;
// types end
const auto& sendTypes = std::array<MPI_Datatype, 8>{
haloCornerType, haloRowType, haloCornerType, //
haloColumnType, haloColumnType, //
haloCornerType, haloRowType, haloCornerType //
};
const auto& recvTypes = sendTypes; // same
const auto& cols = _tileSize.Cols;
const auto& rows = _tileSize.Rows;
auto idx = [&](std::size_t x, std::size_t y) {
return static_cast<MPI_Aint>(y * (cols + 2) + x);
};
std::array<MPI_Aint, 8> sendDisplacements{
idx(1, 1), idx(1, 1), idx(cols, 1), //
idx(1, 1), idx(cols, 1), //
idx(1, rows), idx(1, rows), idx(cols, rows) //
};
//// mirrored
// std::array<MPI_Aint, 8> recvDisplacements{
// idx(cols + 1, rows + 1), idx(1, rows + 1), idx(0, rows + 1), //
// idx(cols + 1, 1), idx(0, 1), //
// idx(cols + 1, 0), idx(1, 0), idx(0, 0) //
//};
// right
std::array<MPI_Aint, 8> recvDisplacements{
idx(0, 0), idx(1, 0), idx(cols + 1, 0), //
idx(0, 1), idx(cols + 1, 1), //
idx(0, rows + 1), idx(1, rows + 1), idx(cols + 1, rows + 1) //
};
//// experimental
//std::array<MPI_Aint, 8> recvDisplacements{
// idx(0, rows + 1), idx(1, rows + 1), idx(cols + 1, rows + 1), //
// idx(0, 1), idx(cols + 1, 1), //
// idx(0, 0), idx(1, 0), idx(cols + 1, 0) //
//};
std::array<int, 8> sizes{
1, 1, 1, //
1, 1, //
1, 1, 1 //
};
auto rank2coord = [&](int rank) {
return Coord{
static_cast<int>(rank % gridSize.Cols), //
static_cast<int>(rank / gridSize.Cols) //
};
};
constexpr auto DebugRank = 0;
auto coord2rank = [&](Coord c) {
// if (env.worldRank() == DebugRank) std::cout << "c2r input X" <<
// c.X << " Y" << c.Y << '\n';
const auto& x = (c.X + gridSize.Cols) % gridSize.Cols;
const auto& y = (c.Y + gridSize.Rows) % gridSize.Rows;
// if (env.worldRank() == DebugRank) std::cout << "c2r after mod X"
// << x << " Y" << y << '\n';
return static_cast<int>(gridSize.Cols * y + x);
};
const auto& co = rank2coord(env.worldRank());
std::array<int, 8> neighbors{
coord2rank({co.X - 1, co.Y - 1}), //
coord2rank({co.X + 0, co.Y - 1}), //
coord2rank({co.X + 1, co.Y - 1}), //
coord2rank({co.X - 1, co.Y + 0}), //
coord2rank({co.X + 1, co.Y + 0}), //
coord2rank({co.X - 1, co.Y + 1}), //
coord2rank({co.X + 0, co.Y + 1}), //
coord2rank({co.X + 1, co.Y + 1}) //
};
if (env.worldRank() == DebugRank) {
std::cout << "neighbors:\n";
for (const auto i : neighbors) std::cout << i << ",\n";
std::cout << '\n';
}
MPI_Comm commDistGraph;
MPI_Dist_graph_create_adjacent(
MPI_COMM_WORLD, // comm_old
neighbors.size(), // indegree
neighbors.data(), // sources
reinterpret_cast<int*>(MPI_UNWEIGHTED), // sourceweights
neighbors.size(), // outdegree
neighbors.data(), // destinations
reinterpret_cast<int*>(MPI_UNWEIGHTED), // destweights
MPI_INFO_NULL, // info
0, // reorder
&commDistGraph // comm_dist_graph
);
MPI_Neighbor_alltoallw(_model.data(), // sendbuf
sizes.data(), // sendcounts
sendDisplacements.data(), // sdispl
sendTypes.data(), // sendtypes
_model.data(), // recvbuf
sizes.data(), // recvcounts
recvDisplacements.data(), // rdispls
recvTypes.data(), // recvtypes
commDistGraph // comm
);
}
friend std::ostream& operator<<(std::ostream& out, const MpiWireworld& g) {
for (std::size_t x{0}; x < g._tileSize.Rows + 2; ++x) {
for (std::size_t y{0}; y < g._tileSize.Cols + 2; ++y) {
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out << to_integral(g._model[x][y]);
}
out << "\"\n";
}
return out;
}
void simulateStep() {
for (std::size_t x{1}; x <= _tileSize.Rows; ++x) {
for (std::size_t y{1}; y <= _tileSize.Cols; ++y) {
auto nextState = _model[x][y];
switch (_model[x][y]) {
case State::ElectronHead:
nextState = State::ElectronTail;
break;
case State::ElectronTail:
nextState = State::Conductor;
break;
case State::Conductor: {
const std::array<State, 9> mooreNeighborhood = {
_model[x - 1][y - 1], //
_model[x + 0][y - 1], //
_model[x + 1][y - 1], //
_model[x - 1][y + 0], //
_model[x + 1][y + 0], //
_model[x - 1][y + 1], //
_model[x + 0][y + 1], //
_model[x + 1][y + 1] //
};
const auto& headCount = std::count(
std::begin(mooreNeighborhood),
std::end(mooreNeighborhood), State::ElectronHead);
nextState = (1 == headCount || headCount == 2)
? State::ElectronHead
: State::Conductor;
} break;
default:
break;
}
_nextModel[x][y] = nextState;
}
}
std::swap(_model, _nextModel);
}
};