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grid.cpp
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grid.cpp
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/*
* This file is part of Vlasiator.
* Copyright 2010-2016 Finnish Meteorological Institute
*
* For details of usage, see the COPYING file and read the "Rules of the Road"
* at http://www.physics.helsinki.fi/vlasiator/
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <cstdlib>
#include <iostream>
#include <iomanip> // for setprecision()
#include <cmath>
#include <vector>
#include <sstream>
#include <ctime>
#ifdef _OPENMP
#include <omp.h>
#endif
#include "grid.h"
#include "vlasovmover.h"
#include "definitions.h"
#include "mpiconversion.h"
#include "logger.h"
#include "parameters.h"
#include "datareduction/datareducer.h"
#include "sysboundary/sysboundary.h"
#include "fieldsolver/fs_common.h"
#include "fieldsolver/gridGlue.hpp"
#include "fieldsolver/derivatives.hpp"
#include "vlasovsolver/cpu_trans_pencils.hpp"
#include "projects/project.h"
#include "iowrite.h"
#include "ioread.h"
#include "object_wrapper.h"
#ifdef PAPI_MEM
#include "papi.h"
#endif
#ifndef NDEBUG
#ifdef VAMR
#define DEBUG_VAMR_VALIDATE
#endif
#endif
using namespace std;
int globalflags::AMRstencilWidth = VLASOV_STENCIL_WIDTH;
extern Logger logFile, diagnostic;
void initVelocityGridGeometry(dccrg::Dccrg<SpatialCell,dccrg::Cartesian_Geometry>& mpiGrid);
void initSpatialCellCoordinates(dccrg::Dccrg<SpatialCell,dccrg::Cartesian_Geometry>& mpiGrid);
void initializeStencils(dccrg::Dccrg<SpatialCell,dccrg::Cartesian_Geometry>& mpiGrid);
void writeVelMesh(dccrg::Dccrg<SpatialCell,dccrg::Cartesian_Geometry>& mpiGrid) {
const vector<CellID>& cells = getLocalCells();
static int counter=0;
stringstream fname;
fname << "VelMesh.";
fname.width(3);
fname.fill(0);
fname << counter << ".vlsv";
vlsv::Writer vlsvWriter;
vlsvWriter.open(fname.str(),MPI_COMM_WORLD,0,MPI_INFO_NULL);
writeVelocityDistributionData(vlsvWriter,mpiGrid,cells,MPI_COMM_WORLD);
vlsvWriter.close();
++counter;
}
void initializeGrids(
int argn,
char **argc,
dccrg::Dccrg<SpatialCell,dccrg::Cartesian_Geometry>& mpiGrid,
FsGrid< std::array<Real, fsgrids::bfield::N_BFIELD>, FS_STENCIL_WIDTH> & perBGrid,
FsGrid< std::array<Real, fsgrids::bgbfield::N_BGB>, FS_STENCIL_WIDTH> & BgBGrid,
FsGrid< std::array<Real, fsgrids::moments::N_MOMENTS>, FS_STENCIL_WIDTH> & momentsGrid,
FsGrid< std::array<Real, fsgrids::moments::N_MOMENTS>, FS_STENCIL_WIDTH> & momentsDt2Grid,
FsGrid< std::array<Real, fsgrids::efield::N_EFIELD>, FS_STENCIL_WIDTH> & EGrid,
FsGrid< std::array<Real, fsgrids::egradpe::N_EGRADPE>, FS_STENCIL_WIDTH> & EGradPeGrid,
FsGrid< std::array<Real, fsgrids::volfields::N_VOL>, FS_STENCIL_WIDTH> & volGrid,
FsGrid< fsgrids::technical, FS_STENCIL_WIDTH> & technicalGrid,
SysBoundary& sysBoundaries,
Project& project
) {
int myRank;
MPI_Comm_rank(MPI_COMM_WORLD,&myRank);
// Init Zoltan:
float zoltanVersion;
if (Zoltan_Initialize(argn,argc,&zoltanVersion) != ZOLTAN_OK) {
if(myRank == MASTER_RANK) cerr << "\t ERROR: Zoltan initialization failed." << endl;
exit(1);
} else {
logFile << "\t Zoltan " << zoltanVersion << " initialized successfully" << std::endl << writeVerbose;
}
MPI_Comm comm = MPI_COMM_WORLD;
int neighborhood_size = VLASOV_STENCIL_WIDTH;
if (P::amrMaxSpatialRefLevel > 0) {
switch (VLASOV_STENCIL_WIDTH) {
case 1:
// Required cells will be included already
break;
case 2:
// looking from high to low refinement: stencil 2 will only give 1 cell, so need to add 1
neighborhood_size = VLASOV_STENCIL_WIDTH+1;
break;
case 3:
// looking from high to low refinement: stencil 3 will only give 2 cells, so need to add 2
// to reach surely into the third low-refinement neighbour
neighborhood_size = VLASOV_STENCIL_WIDTH+2;
break;
default:
std::cerr<<"Warning: unrecognized VLASOV_STENCIL_WIDTH in grid.cpp"<<std::endl;
}
}
globalflags::AMRstencilWidth = neighborhood_size;
const std::array<uint64_t, 3> grid_length = {{P::xcells_ini, P::ycells_ini, P::zcells_ini}};
dccrg::Cartesian_Geometry::Parameters geom_params;
geom_params.start[0] = P::xmin;
geom_params.start[1] = P::ymin;
geom_params.start[2] = P::zmin;
geom_params.level_0_cell_length[0] = P::dx_ini;
geom_params.level_0_cell_length[1] = P::dy_ini;
geom_params.level_0_cell_length[2] = P::dz_ini;
mpiGrid.set_initial_length(grid_length)
.set_load_balancing_method(&P::loadBalanceAlgorithm[0])
.set_neighborhood_length(neighborhood_size)
.set_maximum_refinement_level(P::amrMaxSpatialRefLevel)
.set_periodic(sysBoundaries.isPeriodic(0),
sysBoundaries.isPeriodic(1),
sysBoundaries.isPeriodic(2))
.initialize(comm)
.set_geometry(geom_params);
phiprof::Timer refineTimer {"Refine spatial cells"};
// We need this first as well
recalculateLocalCellsCache();
if (!P::isRestart) {
if (P::amrMaxSpatialRefLevel > 0 && project.refineSpatialCells(mpiGrid)) {
mpiGrid.balance_load();
recalculateLocalCellsCache();
mapRefinement(mpiGrid, technicalGrid);
}
} else {
if (readFileCells(mpiGrid, P::restartFileName)) {
mpiGrid.balance_load();
recalculateLocalCellsCache();
mapRefinement(mpiGrid, technicalGrid);
}
}
refineTimer.stop();
// Init velocity mesh on all cells
initVelocityGridGeometry(mpiGrid);
initializeStencils(mpiGrid);
for (const auto& [key, value] : P::loadBalanceOptions) {
mpiGrid.set_partitioning_option(key, value);
}
phiprof::Timer initialLBTimer {"Initial load-balancing"};
if (myRank == MASTER_RANK) logFile << "(INIT): Starting initial load balance." << endl << writeVerbose;
mpiGrid.balance_load(); // Direct DCCRG call, recalculate cache afterwards
recalculateLocalCellsCache();
SpatialCell::set_mpi_transfer_type(Transfer::VEL_BLOCK_DATA);
mpiGrid.update_copies_of_remote_neighbors(NEAREST_NEIGHBORHOOD_ID);
if(P::amrMaxSpatialRefLevel > 0) {
setFaceNeighborRanks( mpiGrid );
}
const vector<CellID>& cells = getLocalCells();
initialLBTimer.stop();
if (myRank == MASTER_RANK) {
logFile << "(INIT): Set initial state." << endl << writeVerbose;
}
phiprof::Timer initialStateTimer {"Set initial state"};
phiprof::Timer setCoordsTimer {"Set spatial cell coordinates"};
initSpatialCellCoordinates(mpiGrid);
setCoordsTimer.stop();
phiprof::Timer initBoundaryTimer {"Initialize system boundary conditions"};
sysBoundaries.initSysBoundaries(project, P::t_min);
initBoundaryTimer.stop();
SpatialCell::set_mpi_transfer_type(Transfer::CELL_DIMENSIONS);
mpiGrid.update_copies_of_remote_neighbors(SYSBOUNDARIES_NEIGHBORHOOD_ID);
// We want this before restart refinement
phiprof::Timer classifyTimer {"Classify cells (sys boundary conditions)"};
sysBoundaries.classifyCells(mpiGrid,technicalGrid);
classifyTimer.stop();
if (P::isRestart) {
logFile << "Restart from "<< P::restartFileName << std::endl << writeVerbose;
phiprof::Timer restartReadTimer {"Read restart"};
if (readGrid(mpiGrid,perBGrid,EGrid,technicalGrid,P::restartFileName) == false) {
logFile << "(MAIN) ERROR: restarting failed" << endl;
exit(1);
}
restartReadTimer.stop();
if (P::forceRefinement) {
// Adapt refinement to match new static refinement parameters
phiprof::Timer timer {"Restart refinement"};
for (int i = 0; i < P::amrMaxSpatialRefLevel; ++i) {
// (un)Refinement is done one level at a time so we don't blow up memory
if (!adaptRefinement(mpiGrid, technicalGrid, sysBoundaries, project, i)) {
cerr << "(MAIN) ERROR: Forcing refinement takes too much memory" << endl;
exit(1);
}
balanceLoad(mpiGrid, sysBoundaries);
}
} else if (P::refineOnRestart) {
// Considered deprecated
phiprof::Timer timer {"Restart refinement"};
// Get good load balancing for refinement
balanceLoad(mpiGrid, sysBoundaries);
adaptRefinement(mpiGrid, technicalGrid, sysBoundaries, project);
balanceLoad(mpiGrid, sysBoundaries);
}
}
// Check refined cells do not touch boundary cells
phiprof::Timer boundaryCheckTimer {"Check boundary refinement"};
sysBoundaries.checkRefinement(mpiGrid);
boundaryCheckTimer.stop();
if (P::isRestart) {
//initial state for sys-boundary cells, will skip those not set to be reapplied at restart
phiprof::Timer timer {"Apply system boundary conditions state"};
sysBoundaries.applyInitialState(mpiGrid, technicalGrid, perBGrid, BgBGrid, project);
}
// Update technicalGrid
technicalGrid.updateGhostCells(); // This needs to be done at some point
if (!P::isRestart && !P::writeFullBGB) {
// If we are starting a new regular simulation, we need to prepare all cells with their initial state.
// If we're only after writing out the full BGB we don't need all this shebang EXCEPT the weights!
//Initial state based on project, background field in all cells
//and other initial values in non-sysboundary cells
phiprof::Timer applyInitialTimer {"Apply initial state"};
// Go through every cell on this node and initialize the
// -Background field on all cells
// -Perturbed fields and ion distribution function in non-sysboundary cells
// Each initialization has to be independent to avoid threading problems
// Allow the project to set up data structures for it's setCell calls
project.setupBeforeSetCell(cells);
phiprof::Timer setCellTimer {"setCell"};
#pragma omp parallel for schedule(dynamic)
for (size_t i=0; i<cells.size(); ++i) {
SpatialCell* cell = mpiGrid[cells[i]];
if (cell->sysBoundaryFlag == sysboundarytype::NOT_SYSBOUNDARY) {
project.setCell(cell);
}
}
setCellTimer.stop();
// Initial state for sys-boundary cells
applyInitialTimer.stop();
phiprof::Timer applyBCTimer {"Apply system boundary conditions state"};
sysBoundaries.applyInitialState(mpiGrid, technicalGrid, perBGrid, BgBGrid, project);
applyBCTimer.stop();
#pragma omp parallel for schedule(static)
for (size_t i=0; i<cells.size(); ++i) {
mpiGrid[cells[i]]->parameters[CellParams::LBWEIGHTCOUNTER] = 0;
}
for (uint popID=0; popID<getObjectWrapper().particleSpecies.size(); ++popID) {
adjustVelocityBlocks(mpiGrid,cells,true,popID);
#ifdef DEBUG_VAMR_VALIDATE
writeVelMesh(mpiGrid);
validateMesh(mpiGrid,popID);
#endif
// set initial LB metric based on number of blocks, all others
// will be based on time spent in acceleration
#pragma omp parallel for schedule(static)
for (size_t i=0; i<cells.size(); ++i) {
mpiGrid[cells[i]]->parameters[CellParams::LBWEIGHTCOUNTER] += mpiGrid[cells[i]]->get_number_of_velocity_blocks(popID);
}
}
shrink_to_fit_grid_data(mpiGrid); //get rid of excess data already here
/*
// Apply boundary conditions so that we get correct initial moments
sysBoundaries.applySysBoundaryVlasovConditions(mpiGrid,Parameters::t);
//compute moments, and set them in RHO* and RHO_*_DT2. If restart, they are already read in
phiprof::Timer initMomentsTimer {"Init moments"};
calculateInitialVelocityMoments(mpiGrid);
initMomentsTimer.stop();
*/
} else if (P::writeFullBGB) {
// If, instead of starting a regular simulation, we are only writing out the background field, it is enough to set a dummy load balance value of 1 here.
for (size_t i=0; i<cells.size(); ++i) {
mpiGrid[cells[i]]->parameters[CellParams::LBWEIGHTCOUNTER] = 1;
}
}
// Balance load before we transfer all data below
balanceLoad(mpiGrid, sysBoundaries);
// Function includes re-calculation of local cells cache
phiprof::Timer fetchNeighbourTimer {"Fetch Neighbour data", {"MPI"}};
// update complete cell spatial data for full stencil (
SpatialCell::set_mpi_transfer_type(Transfer::ALL_SPATIAL_DATA);
mpiGrid.update_copies_of_remote_neighbors(FULL_NEIGHBORHOOD_ID);
fetchNeighbourTimer.stop();
phiprof::Timer setBTimer {"project.setProjectBField"};
project.setProjectBField(perBGrid, BgBGrid, technicalGrid);
setBTimer.stop();
phiprof::Timer fsGridGhostTimer {"fsgrid-ghost-updates"};
perBGrid.updateGhostCells();
BgBGrid.updateGhostCells();
EGrid.updateGhostCells();
// This will only have the BGB set up properly at this stage but we need the BGBvol for the Vlasov boundaries below.
volGrid.updateGhostCells();
fsGridGhostTimer.stop();
phiprof::Timer getFieldsTimer {"getFieldsFromFsGrid"};
getFieldsFromFsGrid(volGrid, BgBGrid, EGradPeGrid, technicalGrid, mpiGrid, cells);
getFieldsTimer.stop();
setBTimer.stop();
// If we only want the full BGB for writeout, we have it now and we can return early.
if(P::writeFullBGB == true) {
return;
}
if (P::isRestart == false) {
// Apply boundary conditions so that we get correct initial moments
sysBoundaries.applySysBoundaryVlasovConditions(mpiGrid,Parameters::t, true); // It doesn't matter here whether we put _R or _V moments
//compute moments, and set them in RHO* and RHO_*_DT2. If restart, they are already read in
phiprof::Timer timer {"Init moments"};
calculateInitialVelocityMoments(mpiGrid);
} else {
phiprof::Timer timer {"Init moments"};
for (size_t i=0; i<cells.size(); ++i) {
calculateCellMoments(mpiGrid[cells[i]], true, true);
}
}
phiprof::Timer finishFSGridTimer {"Finish fsgrid setup"};
feedMomentsIntoFsGrid(mpiGrid, cells, momentsGrid,technicalGrid, false);
if(!P::isRestart) {
// WARNING this means moments and dt2 moments are the same here at t=0, which is a feature so far.
feedMomentsIntoFsGrid(mpiGrid, cells, momentsDt2Grid, technicalGrid, false);
} else {
feedMomentsIntoFsGrid(mpiGrid, cells, momentsDt2Grid, technicalGrid, true);
}
momentsGrid.updateGhostCells();
momentsDt2Grid.updateGhostCells();
finishFSGridTimer.stop();
// Set this so CFL doesn't break
if(P::refineOnRestart) {
// Half-step acceleration
if( P::propagateVlasovAcceleration ) {
calculateAcceleration(mpiGrid, -0.5*P::dt + 0.5*P::bailout_min_dt);
} else {
calculateAcceleration(mpiGrid, 0.0);
}
P::dt = P::bailout_min_dt;
}
initialStateTimer.stop();
}
// initialize velocity grid of spatial cells before creating cells in dccrg.initialize
void initVelocityGridGeometry(dccrg::Dccrg<SpatialCell,dccrg::Cartesian_Geometry>& mpiGrid){
// Velocity mesh(es) are created in parameters.cpp, here we just
// trigger the initialization of static variables in vmesh::VelocityMesh class.
SpatialCell dummy;
dummy.initialize_mesh();
}
void initSpatialCellCoordinates(dccrg::Dccrg<SpatialCell,dccrg::Cartesian_Geometry>& mpiGrid) {
vector<CellID> cells = mpiGrid.get_cells();
#pragma omp parallel for
for (size_t i=0; i<cells.size(); ++i) {
std::array<double, 3> cell_min = mpiGrid.geometry.get_min(cells[i]);
std::array<double, 3> cell_length = mpiGrid.geometry.get_length(cells[i]);
mpiGrid[cells[i]]->parameters[CellParams::XCRD] = cell_min[0];
mpiGrid[cells[i]]->parameters[CellParams::YCRD] = cell_min[1];
mpiGrid[cells[i]]->parameters[CellParams::ZCRD] = cell_min[2];
mpiGrid[cells[i]]->parameters[CellParams::DX ] = cell_length[0];
mpiGrid[cells[i]]->parameters[CellParams::DY ] = cell_length[1];
mpiGrid[cells[i]]->parameters[CellParams::DZ ] = cell_length[2];
mpiGrid[cells[i]]->parameters[CellParams::CELLID] = cells[i];
mpiGrid[cells[i]]->parameters[CellParams::REFINEMENT_LEVEL] = mpiGrid.get_refinement_level(cells[i]);
}
}
/*
Record for each cell which processes own one or more of its face neighbors
*/
void setFaceNeighborRanks( dccrg::Dccrg<SpatialCell,dccrg::Cartesian_Geometry>& mpiGrid ) {
const vector<CellID>& cells = getLocalCells();
// TODO: Try a #pragma omp parallel for
for (const auto& cellid : cells) {
if (cellid == INVALID_CELLID) continue;
SpatialCell* cell = mpiGrid[cellid];
if (!cell) continue;
cell->face_neighbor_ranks.clear();
for (const auto& [neighbor, dir] : mpiGrid.get_face_neighbors_of(cellid)) {
int neighborhood;
// We store rank numbers into a map that has neighborhood ids as its key values.
switch (dir) {
case -3:
neighborhood = SHIFT_M_Z_NEIGHBORHOOD_ID;
break;
case -2:
neighborhood = SHIFT_M_Y_NEIGHBORHOOD_ID;
break;
case -1:
neighborhood = SHIFT_M_X_NEIGHBORHOOD_ID;
break;
case +1:
neighborhood = SHIFT_P_X_NEIGHBORHOOD_ID;
break;
case +2:
neighborhood = SHIFT_P_Y_NEIGHBORHOOD_ID;
break;
case +3:
neighborhood = SHIFT_P_Z_NEIGHBORHOOD_ID;
break;
default:
cerr << "Invalid face neighbor dimension: " << dir << " in " << __FILE__ << ":" << __LINE__ << std::endl;
abort();
}
cell->face_neighbor_ranks[neighborhood].insert(mpiGrid.get_process(neighbor));
}
}
}
void balanceLoad(dccrg::Dccrg<SpatialCell,dccrg::Cartesian_Geometry>& mpiGrid, SysBoundary& sysBoundaries){
// Invalidate cached cell lists
Parameters::meshRepartitioned = true;
// tell other processes which velocity blocks exist in remote spatial cells
phiprof::Timer balanceLoadTimer {"Balancing load", {"Load balance"}};
phiprof::Timer deallocTimer {"deallocate boundary data"};
//deallocate blocks in remote cells to decrease memory load
deallocateRemoteCellBlocks(mpiGrid);
deallocTimer.stop();
//set weights based on each cells LB weight counter
const vector<CellID>& cells = getLocalCells();
for (size_t i=0; i<cells.size(); ++i){
// Set cell weight. We could use different counters or number of blocks if different solvers are active.
// if (P::propagateVlasovAcceleration)
// When using the FS-SPLIT functionality, Jaro Hokkanen reported issues with using the regular
// CellParams::LBWEIGHTCOUNTER, so use of blockscounts + 1 might be required.
mpiGrid.set_cell_weight(cells[i], (Real)1 + mpiGrid[cells[i]]->parameters[CellParams::LBWEIGHTCOUNTER]);
}
phiprof::Timer initLBTimer {"dccrg.initialize_balance_load"};
mpiGrid.initialize_balance_load(true);
initLBTimer.stop();
const std::unordered_set<CellID>& incoming_cells = mpiGrid.get_cells_added_by_balance_load();
std::vector<CellID> incoming_cells_list (incoming_cells.begin(),incoming_cells.end());
const std::unordered_set<CellID>& outgoing_cells = mpiGrid.get_cells_removed_by_balance_load();
std::vector<CellID> outgoing_cells_list (outgoing_cells.begin(),outgoing_cells.end());
/*transfer cells in parts to preserve memory*/
phiprof::Timer transfersTimer {"Data transfers"};
const uint64_t num_part_transfers=5;
for (uint64_t transfer_part=0; transfer_part<num_part_transfers; transfer_part++) {
//Set transfers on/off for the incoming cells in this transfer set and prepare for receive
for (unsigned int i=0;i<incoming_cells_list.size();i++){
CellID cell_id=incoming_cells_list[i];
SpatialCell* cell = mpiGrid[cell_id];
if (cell_id%num_part_transfers!=transfer_part) {
cell->set_mpi_transfer_enabled(false);
} else {
cell->set_mpi_transfer_enabled(true);
}
}
//Set transfers on/off for the outgoing cells in this transfer set
for (unsigned int i=0; i<outgoing_cells_list.size(); i++) {
CellID cell_id=outgoing_cells_list[i];
SpatialCell* cell = mpiGrid[cell_id];
if (cell_id%num_part_transfers!=transfer_part) {
cell->set_mpi_transfer_enabled(false);
} else {
cell->set_mpi_transfer_enabled(true);
}
}
for (size_t p=0; p<getObjectWrapper().particleSpecies.size(); ++p) {
// Set active population
SpatialCell::setCommunicatedSpecies(p);
//Transfer velocity block list
SpatialCell::set_mpi_transfer_type(Transfer::VEL_BLOCK_LIST_STAGE1);
mpiGrid.continue_balance_load();
SpatialCell::set_mpi_transfer_type(Transfer::VEL_BLOCK_LIST_STAGE2);
mpiGrid.continue_balance_load();
int prepareReceives {phiprof::initializeTimer("Preparing receives")};
int receives = 0;
for (unsigned int i=0; i<incoming_cells_list.size(); i++) {
CellID cell_id=incoming_cells_list[i];
SpatialCell* cell = mpiGrid[cell_id];
if (cell_id % num_part_transfers == transfer_part) {
receives++;
// reserve space for velocity block data in arriving remote cells
phiprof::Timer timer {prepareReceives};
cell->prepare_to_receive_blocks(p);
timer.stop(1, "Spatial cells");
}
}
if(receives == 0) {
//empty phiprof timer, to avoid unneccessary divergence in unique
//profiles (keep order same)
phiprof::Timer timer {prepareReceives};
timer.stop(0, "Spatial cells");
}
//do the actual transfer of data for the set of cells to be transferred
phiprof::Timer transferTimer {"transfer_all_data"};
SpatialCell::set_mpi_transfer_type(Transfer::ALL_DATA);
mpiGrid.continue_balance_load();
transferTimer.stop();
// Free memory for cells that have been sent (the block data)
for (unsigned int i=0;i<outgoing_cells_list.size();i++){
CellID cell_id=outgoing_cells_list[i];
SpatialCell* cell = mpiGrid[cell_id];
// Free memory of this cell as it has already been transferred,
// it will not be used anymore. NOTE: Only clears memory allocated
// to the active population.
if (cell_id % num_part_transfers == transfer_part) cell->clear(p);
}
} // for-loop over populations
} // for-loop over transfer parts
transfersTimer.stop();
//finish up load balancing
phiprof::Timer finishLBTimer {"dccrg.finish_balance_load"};
mpiGrid.finish_balance_load();
finishLBTimer.stop();
//Make sure transfers are enabled for all cells
recalculateLocalCellsCache();
#pragma omp parallel for
for (uint i=0; i<cells.size(); ++i) {
mpiGrid[cells[i]]->set_mpi_transfer_enabled(true);
}
// flag transfers if AMR
phiprof::Timer computeTransferTimer {"compute_amr_transfer_flags"};
flagSpatialCellsForAmrCommunication(mpiGrid,cells);
computeTransferTimer.stop();
// Communicate all spatial data for FULL neighborhood, which
// includes all data with the exception of dist function data
SpatialCell::set_mpi_transfer_type(Transfer::ALL_SPATIAL_DATA);
mpiGrid.update_copies_of_remote_neighbors(FULL_NEIGHBORHOOD_ID);
phiprof::Timer updateBlocksTimer {"update block lists"};
//new partition, re/initialize blocklists of remote cells.
for (uint popID=0; popID<getObjectWrapper().particleSpecies.size(); ++popID) {
updateRemoteVelocityBlockLists(mpiGrid,popID);
}
updateBlocksTimer.stop();
phiprof::Timer updateBoundariesTimer {"update sysboundaries"};
sysBoundaries.updateSysBoundariesAfterLoadBalance( mpiGrid );
updateBoundariesTimer.stop();
phiprof::Timer initSolversTimer {"Init solvers"};
// Initialize field propagator (only if in use):
if (Parameters::propagateField == true) {
if (initializeFieldPropagatorAfterRebalance() == false) {
logFile << "(MAIN): Field propagator did not initialize correctly!" << endl << writeVerbose;
exit(1);
}
}
initSolversTimer.stop();
// Record ranks of face neighbors
if(P::amrMaxSpatialRefLevel > 0) {
phiprof::Timer timer {"set face neighbor ranks"};
setFaceNeighborRanks( mpiGrid );
}
// Prepare cellIDs and pencils for AMR translation
if(P::amrMaxSpatialRefLevel > 0) {
prepareSeedIdsAndPencils(mpiGrid);
}
}
/*
Adjust sparse velocity space to make it consistent in all 6 dimensions.
Further documentation in grid.h
*/
bool adjustVelocityBlocks(dccrg::Dccrg<SpatialCell,dccrg::Cartesian_Geometry>& mpiGrid,
const vector<CellID>& cellsToAdjust,
bool doPrepareToReceiveBlocks,
const uint popID) {
phiprof::Timer readjustBlocksTimer {"re-adjust blocks", {"Block adjustment"}};
SpatialCell::setCommunicatedSpecies(popID);
const vector<CellID>& cells = getLocalCells();
phiprof::Timer computeTimer {"Compute with_content_list"};
#pragma omp parallel for
for (uint i=0; i<cells.size(); ++i) {
mpiGrid[cells[i]]->updateSparseMinValue(popID);
mpiGrid[cells[i]]->update_velocity_block_content_lists(popID);
}
computeTimer.stop();
if (doPrepareToReceiveBlocks) {
// We are in the last substep of acceleration, so need to account for neighbours
phiprof::Timer transferTimer {"Transfer with_content_list", {"MPI"}};
SpatialCell::set_mpi_transfer_type(Transfer::VEL_BLOCK_WITH_CONTENT_STAGE1 );
mpiGrid.update_copies_of_remote_neighbors(NEAREST_NEIGHBORHOOD_ID);
SpatialCell::set_mpi_transfer_type(Transfer::VEL_BLOCK_WITH_CONTENT_STAGE2 );
mpiGrid.update_copies_of_remote_neighbors(NEAREST_NEIGHBORHOOD_ID);
transferTimer.stop();
}
//Adjusts velocity blocks in local spatial cells, doesn't adjust velocity blocks in remote cells.
phiprof::Timer adjustimer {"Adjusting blocks"};
#pragma omp parallel for schedule(dynamic)
for (size_t i=0; i<cellsToAdjust.size(); ++i) {
Real density_pre_adjust=0.0;
Real density_post_adjust=0.0;
CellID cell_id=cellsToAdjust[i];
SpatialCell* cell = mpiGrid[cell_id];
vector<SpatialCell*> neighbor_ptrs;
if (doPrepareToReceiveBlocks) {
// gather spatial neighbor list and gather vector with pointers to cells
// If we are within an acceleration substep prior to the last one,
// it's enough to adjust blocks based on local data only, and in
// that case we simply pass an empty list of pointers.
const auto* neighbors = mpiGrid.get_neighbors_of(cell_id, NEAREST_NEIGHBORHOOD_ID);
// Note: at AMR refinement boundaries this can cause blocks to propagate further
// than absolutely required. Face neighbours, however, are not enough as we must
// account for diagonal propagation.
neighbor_ptrs.reserve(neighbors->size());
for ( const auto& [neighbor_id, dir] : *neighbors) {
if (neighbor_id != 0) {
neighbor_ptrs.push_back(mpiGrid[neighbor_id]);
}
}
}
if (getObjectWrapper().particleSpecies[popID].sparse_conserve_mass) {
for (size_t i=0; i<cell->get_number_of_velocity_blocks(popID)*WID3; ++i) {
density_pre_adjust += cell->get_data(popID)[i];
}
}
cell->adjust_velocity_blocks(neighbor_ptrs,popID);
if (getObjectWrapper().particleSpecies[popID].sparse_conserve_mass) {
for (size_t i=0; i<cell->get_number_of_velocity_blocks(popID)*WID3; ++i) {
density_post_adjust += cell->get_data(popID)[i];
}
if (density_post_adjust != 0.0) {
for (size_t i=0; i<cell->get_number_of_velocity_blocks(popID)*WID3; ++i) {
cell->get_data(popID)[i] *= density_pre_adjust/density_post_adjust;
}
}
}
}
adjustimer.stop();
//Updated newly adjusted velocity block lists on remote cells, and
//prepare to receive block data
if (doPrepareToReceiveBlocks) {
updateRemoteVelocityBlockLists(mpiGrid,popID);
}
return true;
}
/*! Shrink to fit velocity space data to save memory.
* \param mpiGrid Spatial grid
*/
void shrink_to_fit_grid_data(dccrg::Dccrg<SpatialCell,dccrg::Cartesian_Geometry>& mpiGrid) {
const std::vector<CellID>& cells = getLocalCells();
const std::vector<CellID>& remote_cells = mpiGrid.get_remote_cells_on_process_boundary(FULL_NEIGHBORHOOD_ID);
#pragma omp parallel for
for(size_t i=0; i<cells.size() + remote_cells.size(); ++i) {
if(i < cells.size()){
SpatialCell* target= mpiGrid[cells[i]];
if (target!=nullptr){
target->shrink_to_fit();
}
}else{
SpatialCell* target= mpiGrid[remote_cells[i - cells.size()]];
if (target!=nullptr){
target->shrink_to_fit();
}
}
}
}
/*! Estimates memory consumption and writes it into logfile. Collective operation on MPI_COMM_WORLD
* \param mpiGrid Spatial grid
*/
void report_grid_memory_consumption(dccrg::Dccrg<SpatialCell,dccrg::Cartesian_Geometry>& mpiGrid) {
/*now report memory consumption into logfile*/
const vector<CellID>& cells = getLocalCells();
const std::vector<CellID> remote_cells = mpiGrid.get_remote_cells_on_process_boundary();
int rank,n_procs;
MPI_Comm_size(MPI_COMM_WORLD, &n_procs);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
/* Compute memory statistics of the memory consumption of the spatial cells.
* Internally we use double as MPI does
* not define proper uint64_t datatypes for MAXLOCNot Real, as we
* want double here not to loose accuracy.
*/
/*report data for memory needed by blocks*/
double mem[6] = {0};
double sum_mem[6];
for(unsigned int i=0;i<cells.size();i++){
mem[0] += mpiGrid[cells[i]]->get_cell_memory_size();
mem[3] += mpiGrid[cells[i]]->get_cell_memory_capacity();
}
for(unsigned int i=0;i<remote_cells.size();i++){
mem[1] += mpiGrid[remote_cells[i]]->get_cell_memory_size();
mem[4] += mpiGrid[remote_cells[i]]->get_cell_memory_capacity();
}
mem[2] = mem[0] + mem[1];//total meory according to size()
mem[5] = mem[3] + mem[4];//total memory according to capacity()
MPI_Reduce(mem, sum_mem, 6, MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD);
logFile << "(MEM) Total size: " << sum_mem[2] << endl;
logFile << "(MEM) Total capacity " << sum_mem[5] << endl;
struct {
double val;
int rank;
} max_mem[3],mem_usage_loc[3],min_mem[3];
for(uint i = 0; i<3; i++){
mem_usage_loc[i].val = mem[i + 3]; //report on capacity numbers (6: local cells, 7: remote cells, 8: all cells)
mem_usage_loc[i].rank = rank;
}
MPI_Reduce(mem_usage_loc, max_mem, 3, MPI_DOUBLE_INT, MPI_MAXLOC, 0, MPI_COMM_WORLD);
MPI_Reduce(mem_usage_loc, min_mem, 3, MPI_DOUBLE_INT, MPI_MINLOC, 0, MPI_COMM_WORLD);
logFile << "(MEM) Average capacity: " << sum_mem[5]/n_procs << " local cells " << sum_mem[3]/n_procs << " remote cells " << sum_mem[4]/n_procs << endl;
logFile << "(MEM) Max capacity: " << max_mem[2].val << " on process " << max_mem[2].rank << endl;
logFile << "(MEM) Min capacity: " << min_mem[2].val << " on process " << min_mem[2].rank << endl;
logFile << writeVerbose;
}
/*! Deallocates all block data in remote cells in order to save
* memory
* \param mpiGrid Spatial grid
*/
void deallocateRemoteCellBlocks(dccrg::Dccrg<SpatialCell,dccrg::Cartesian_Geometry>& mpiGrid) {
const std::vector<uint64_t> incoming_cells
= mpiGrid.get_remote_cells_on_process_boundary(VLASOV_SOLVER_NEIGHBORHOOD_ID);
for(unsigned int i=0;i<incoming_cells.size();i++){
uint64_t cell_id=incoming_cells[i];
SpatialCell* cell = mpiGrid[cell_id];
if (cell != NULL) {
for (uint popID=0; popID<getObjectWrapper().particleSpecies.size(); ++popID)
cell->clear(popID);
}
}
}
/*
Updates velocity block lists between remote neighbors and prepares local
copies of remote neighbors for receiving velocity block data.
*/
void updateRemoteVelocityBlockLists(
dccrg::Dccrg<SpatialCell,dccrg::Cartesian_Geometry>& mpiGrid,
const uint popID,
const uint neighborhood/*=DIST_FUNC_NEIGHBORHOOD_ID default*/
)
{
SpatialCell::setCommunicatedSpecies(popID);
// update velocity block lists For small velocity spaces it is
// faster to do it in one operation, and not by first sending size,
// then list. For large we do it in two steps
phiprof::Timer updateTimer {"Velocity block list update", {"MPI"}};
SpatialCell::set_mpi_transfer_type(Transfer::VEL_BLOCK_LIST_STAGE1);
mpiGrid.update_copies_of_remote_neighbors(neighborhood);
SpatialCell::set_mpi_transfer_type(Transfer::VEL_BLOCK_LIST_STAGE2);
mpiGrid.update_copies_of_remote_neighbors(neighborhood);
updateTimer.stop();
// Prepare spatial cells for receiving velocity block data
phiprof::Timer receivesTimer {"Preparing receives"};
const std::vector<uint64_t> incoming_cells = mpiGrid.get_remote_cells_on_process_boundary(neighborhood);
#pragma omp parallel for
for (unsigned int i=0; i<incoming_cells.size(); ++i) {
uint64_t cell_id = incoming_cells[i];
SpatialCell* cell = mpiGrid[cell_id];
if (cell == NULL) {
//for (const auto& cell: mpiGrid.local_cells()) {
for (const auto& cell: mpiGrid.local_cells) {
if (cell.id == cell_id) {
cerr << __FILE__ << ":" << __LINE__ << std::endl;
abort();
}
for (const auto& neighbor: cell.neighbors_of) {
if (neighbor.id == cell_id) {
cerr << __FILE__ << ":" << __LINE__ << std::endl;
abort();
}
}
}
continue;
}
cell->prepare_to_receive_blocks(popID);
}
receivesTimer.stop(incoming_cells.size(), "SpatialCells");
}
/*
Set stencils. These are the stencils (in 2D, real ones in 3D of
course). x are stencil neighbor to cell local cell o:
NEAREST SYSBOUNDARIES (nearest neighbor)
-----------
xxx
xox
xxx
-----------
EXTENDED_SYSBOUNDARIES (second nearest neighbor, also in diagonal)
-----------
xxxxx
xxxxx
xxoxx
xxxxx
xxxxx
-----------
VLASOV
-----------
x
x
xxoxx
x
x
-----------
VLASOV_{XYZ}
-----------
xxoxxx
-----------
VLASOV_TARGET_{XYZ}
-----------
xox
-----------
DIST_FUNC (Includes all cells which should know about each others blocks and have space for them. VLASOV + SYSBOUNDARIES.
-----------
x
xxx
xxoxx
xxx
x
-----------
FULL (Includes all possible communication, possible AMR extension)
-----------
A
xxxxx
xxxxx
AxxoxxA
xxxxx
xxxxx
A
-----------
SHIFT_M_X ox
SHIFT_P_X xo
Y, Z in the same way
*/
void initializeStencils(dccrg::Dccrg<SpatialCell,dccrg::Cartesian_Geometry>& mpiGrid){
// set reduced neighborhoods
typedef dccrg::Types<3>::neighborhood_item_t neigh_t;
// set a reduced neighborhood for nearest neighbours
std::vector<neigh_t> neighborhood;
for (int z = -1; z <= 1; z++) {
for (int y = -1; y <= 1; y++) {
for (int x = -1; x <= 1; x++) {
if (x == 0 && y == 0 && z == 0) {
continue;
}
neigh_t offsets = {{x, y, z}};
neighborhood.push_back(offsets);
}
}
}
//mpiGrid.add_neighborhood(FIELD_SOLVER_NEIGHBORHOOD_ID, neighborhood);
if (!mpiGrid.add_neighborhood(NEAREST_NEIGHBORHOOD_ID, neighborhood)){
std::cerr << "Failed to add neighborhood NEAREST_NEIGHBORHOOD_ID \n";
abort();
}
if (!mpiGrid.add_neighborhood(SYSBOUNDARIES_NEIGHBORHOOD_ID, neighborhood)){
std::cerr << "Failed to add neighborhood SYSBOUNDARIES_NEIGHBORHOOD_ID \n";
abort();
}
neighborhood.clear();
for (int z = -2; z <= 2; z++) {
for (int y = -2; y <= 2; y++) {
for (int x = -2; x <= 2; x++) {
if (x == 0 && y == 0 && z == 0) {
continue;
}
neigh_t offsets = {{x, y, z}};
neighborhood.push_back(offsets);
}
}
}
if (!mpiGrid.add_neighborhood(SYSBOUNDARIES_EXTENDED_NEIGHBORHOOD_ID, neighborhood)){
std::cerr << "Failed to add neighborhood SYSBOUNDARIES_EXTENDED_NEIGHBORHOOD_ID \n";
abort();
}
// In spatial AMR using DCCRG, the neighbors are considered relative to a given cell's size.
// To get two coarse neighbors from a fine cell at interfaces, the stencil size needs to be increased by one.
int addStencilDepth = 0;
if (P::amrMaxSpatialRefLevel > 0) {
switch (VLASOV_STENCIL_WIDTH) {
case 1:
// Required cells will be included already