RotationMPIFMM.cpp 9.67 KB
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// ===================================================================================
// Copyright ScalFmm 2011 INRIA, Olivier Coulaud, Berenger Bramas
// olivier.coulaud@inria.fr, berenger.bramas@inria.fr
// This software is a computer program whose purpose is to compute the FMM.
//
// This software is governed by the CeCILL-C and LGPL licenses and
// abiding by the rules of distribution of free software.
//
// 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 and CeCILL-C Licenses for more details.
// "http://www.cecill.info".
// "http://www.gnu.org/licenses".
// ===================================================================================

// ==== CMAKE =====
// @FUSE_MPI
// ================

#include <iostream>
#include <stdexcept>
#include <cstdio>
#include <cstdlib>


#include "ScalFmmConfig.h"
#include "../../Src/Containers/FOctree.hpp"
#include "../../Src/Utils/FMpi.hpp"
#include "../../Src/Core/FFmmAlgorithmThreadProc.hpp"

#include "../../Src/Files/FFmaGenericLoader.hpp"
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#include "../../Src/Files/FMpiFmaGenericLoader.hpp"
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#include "../../Src/Files/FMpiTreeBuilder.hpp"

#include "../../Src/BalanceTree/FLeafBalance.hpp"

#include "../../Src/Kernels/Rotation/FRotationKernel.hpp"
#include "../../Src/Kernels/Rotation/FRotationCell.hpp"

#include "../../Src/Components/FSimpleLeaf.hpp"
#include "../../Src/Kernels/P2P/FP2PParticleContainerIndexed.hpp"

#include "../../Src/Utils/FParameters.hpp"


/// \file  RotationFMMProc.cpp
//!
//! \brief This program runs the MPI FMM  with harmonic spherical approximation of 1/r kernel
//!  \authors B. Bramas, O. Coulaud
//!
//!  This code is a short example to use the rotation harmonic spherical approximation for the 1/r kernel
//!
//!
//!  <b> General arguments:</b>
//!     \param   -help(-h)      to see the parameters available in this driver
//!     \param   -depth          The depth of the octree
//!     \param   -subdepth     Specifies the size of the sub octree
//!     \param   -t                   The number of threads
//!
//!     \param   -f name          Name of the particles file. The file have to be in our FMA format
//!     \param   -bin                 if the file is in binary mode
//!
//

void usage() {
  std::cout << "Driver for Rotation Spherical kernel using MPI  (1/r kernel)" << std::endl;
  std::cout <<	 "Options  "<< std::endl
	    <<     "      -help         to see the parameters    " << std::endl
	    <<	  "      -depth       the depth of the octree   "<< std::endl
	    <<	  "      -subdepth  specifies the size of the sub octree   " << std::endl
	    <<     "      -f   name    name specifies the name of the particle distribution" << std::endl
	    <<     "      -t  n  specifies the number of threads used in the computations" << std::endl
	    <<     "  CMD >> mpirun -np nb_proc_needed ./RotationFMMProc ....."  << std::endl;
}

// Simply create particles and try the kernels
int main(int argc, char* argv[])
{
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  const std::string defaultFile(/*SCALFMMDataPath+*/"../Data/test20k.fma");
  const std::string filename                = FParameters::getStr(argc,argv,"-f", defaultFile.c_str());
  const unsigned int TreeHeight       = FParameters::getValue(argc, argv, "-depth", 5);
  const unsigned int SubTreeHeight  = FParameters::getValue(argc, argv, "-subdepth", 2);
  const unsigned int NbThreads        = FParameters::getValue(argc, argv, "-t", 1);
  if(FParameters::existParameter(argc, argv, "-h")||FParameters::existParameter(argc, argv, "-help")){
    usage() ;
    exit(-1);
  }
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#ifdef _OPENMP
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  omp_set_num_threads(NbThreads);
  std::cout << "\n>> Using " << omp_get_max_threads() << " threads.\n" << std::endl;
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#else
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  std::cout << "\n>> Sequential version.\n" << std::endl;
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#endif
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  //
  std::cout <<	 "Parameters  "<< std::endl
	    <<     "      Octree Depth      "<< TreeHeight <<std::endl
	    <<	 "      SubOctree depth "<< SubTreeHeight <<std::endl
	    <<     "      Input file  name: " <<filename <<std::endl
	    <<     "      Thread number:  " << NbThreads <<std::endl
	    <<std::endl;
  //init values for MPI
  FMpi app(argc,argv);
  //
  // init timer
  FTic time;

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  FMpiFmaGenericLoader* loader = new FMpiFmaGenericLoader(filename,app.global());
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  if(!loader->isOpen()) throw std::runtime_error("Particle file couldn't be opened!") ;
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  ////////////////////////////////////////////////////////////////////



  // begin spherical kernel

  // accuracy
  const unsigned int P = 22;
  // typedefs
  typedef FP2PParticleContainerIndexed<>                     ContainerClass;
  typedef FSimpleLeaf< ContainerClass >                       LeafClass;
  typedef FRotationCell<P>                                             CellClass;
  typedef FOctree<CellClass,ContainerClass,LeafClass>  OctreeClass;
  //
  typedef FRotationKernel< CellClass, ContainerClass , P>   KernelClass;
  //
  typedef FFmmAlgorithmThreadProc<OctreeClass,CellClass,ContainerClass,KernelClass,LeafClass> FmmClassProc;

  // init oct-tree
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  OctreeClass tree(TreeHeight, SubTreeHeight, loader->getBoxWidth(), loader->getCenterOfBox());
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  { // -----------------------------------------------------
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    if(app.global().processId() == 0){
      std::cout << "Creating & Inserting " << loader->getNumberOfParticles()
		<< " particles ..." << std::endl;
      std::cout << "\tHeight : " << TreeHeight << " \t sub-height : " << SubTreeHeight << std::endl;
    }
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    time.tic();
    //

    struct TestParticle{
      int indexInFile;
      FPoint position;
      FReal physicalValue;
      const FPoint& getPosition(){
	return position;
      }
    };
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    TestParticle* particles = new TestParticle[loader->getMyNumberOfParticles()];
    memset(particles, 0, (unsigned int) (sizeof(TestParticle) * loader->getMyNumberOfParticles()));
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    //idx (in file) of the first part that will be used by this proc. 
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    int idxStart = loader->getStart();
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    for(int idxPart = 0 ; idxPart < loader->getMyNumberOfParticles() ; ++idxPart){
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      //Storage of the index (in the original file) of each part.
      particles[idxPart].indexInFile = idxPart + idxStart;
      
      // Read particles from file
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      loader->fillParticle(&particles[idxPart].position,&particles[idxPart].physicalValue);
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    }
    
    FVector<TestParticle> finalParticles;
    FLeafBalance balancer;
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    FMpiTreeBuilder< TestParticle >::DistributeArrayToContainer(app.global(), particles, loader->getMyNumberOfParticles(),
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						 tree.getBoxCenter(),
						 tree.getBoxWidth(),
						 tree.getHeight(), &finalParticles,&balancer);

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    for(int idx = 0 ; idx < finalParticles.getSize(); ++idx){
      tree.insert(finalParticles[idx].position,finalParticles[idx].indexInFile,finalParticles[idx].physicalValue);
    }
    
    delete[] particles;
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    time.tac();
    std::cout << "Done  " << "(@Creating and Inserting Particles = "
	      << time.elapsed() << "s)." << std::endl;
  } // -----------------------------------------------------
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  { // -----------------------------------------------------
    std::cout << "\nRotation harmonic Spherical FMM Proc (P="<< P << ") ... " << std::endl;
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    time.tic();
    //
    // Here we use a pointer due to the limited size of the stack
    //
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    KernelClass *kernels = new KernelClass(TreeHeight, loader->getBoxWidth(), loader->getCenterOfBox());
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    //
    FmmClassProc algorithm(app.global(),&tree, kernels);
    //
    algorithm.execute();   // Here the call of the FMM algorithm
    //
    time.tac();
    std::cout << "Done  " << "(@Algorithm = " << time.elapsed() << "s)." << std::endl;
  }
  // -----------------------------------------------------
  //
  // Some output
  //
  //

  { // -----------------------------------------------------
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    long int N1=0, N2= loader->getNumberOfParticles()/2, N3= (loader->getNumberOfParticles()-1); ;
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    FReal energy =0.0 ;
    //
    //   Loop over all leaves
    //
    std::cout <<std::endl<<" &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& "<<std::endl;
    std::cout << std::scientific;
    std::cout.precision(10) ;
	  
    tree.forEachLeaf([&](LeafClass* leaf){
	const FReal*const posX = leaf->getTargets()->getPositions()[0];
	const FReal*const posY = leaf->getTargets()->getPositions()[1];
	const FReal*const posZ = leaf->getTargets()->getPositions()[2];
	const FReal*const potentials = leaf->getTargets()->getPotentials();
	const FReal*const forcesX = leaf->getTargets()->getForcesX();
	const FReal*const forcesY = leaf->getTargets()->getForcesY();
	const FReal*const forcesZ = leaf->getTargets()->getForcesZ();
	const int nbParticlesInLeaf = leaf->getTargets()->getNbParticles();
	const FReal*const physicalValues = leaf->getTargets()->getPhysicalValues();
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	const FVector<int>& indexes = leaf->getTargets()->getIndexes();
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	for(int idxPart = 0 ; idxPart < nbParticlesInLeaf ; ++idxPart){
	  const int indexPartOrig = indexes[idxPart];
	  if ((indexPartOrig == N1) || (indexPartOrig == N2) || (indexPartOrig == N3)  ) {
	    std::cout << "Proc "<< app.global().processId() << " Index "<< indexPartOrig << "  potential  " << potentials[idxPart]
		      << " Pos "<<posX[idxPart]<<" "<<posY[idxPart]<<" "<<posZ[idxPart]  
		      << "   Forces: " << forcesX[idxPart] << " " << forcesY[idxPart] << " "<< forcesZ[idxPart] <<std::endl;
	  }
	  energy += potentials[idxPart]*physicalValues[idxPart] ;
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	}
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      });
	  
    FReal gloEnergy = app.global().reduceSum(energy);
    if(0 == app.global().processId()){
      std::cout <<std::endl << "Proc "<< app.global().processId() << " Energy: "<< gloEnergy <<std::endl;
      std::cout <<std::endl <<" &&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&& "<<std::endl<<std::endl;
    }
  }
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  delete loader;
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  // -----------------------------------------------------
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  return 0;
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}