Api updated, testChebInterface will execute both API internal Chebyshev and...

Api updated, testChebInterface will execute both API internal Chebyshev and API user kernel Chebyshev and display some output

Addons/CKernelApi/Src/CScalfmmApi.h

@@ -380,11 +380,20 @@ typedef void (*Callback_M2M)(int level, void* parentCell, int childPosition, voi
  * @param targetCell pointer to cell to be filled
  * @param sourceCellPosition number of source cell (source cell
  * position in the tree can inferred from its number (refer to doc))
- * @param sourceCell array of cell to be read
+ * @param sourceCell cell to be read
  * @param userData datas specific to the user's kernel
  */
 typedef void (*Callback_M2L)(int level, void* targetCell, int sourceCellPosition, void* sourceCell, void* userData);
 
+/**
+ * @brief Function to be filled by user's M2L
+ * @param level current level in the tree
+ * @param targetCell pointer to cell to be filled
+ * @param sourceCell array of cell to be read
+ * @param userData datas specific to the user's kernel
+ */
+typedef void (*Callback_M2LFull)(int level, void* targetCell, void* sourceCell[343], void* userData);
+
 /**
  * @brief Function to be filled by user's L2L
  * @param level current level in the tree
@@ -414,6 +423,19 @@ typedef void (*Callback_L2P)(void* leafCell, int nbParticles,const int* particle
  */
 typedef void (*Callback_P2P)(int nbParticles, const int* particleIndexes, int nbSourceParticles, const int* sourceParticleIndexes, void* userData);
 
+/**
+ * @brief Function to be filled by user's P2P
+ * @param nbParticles number of particle in current leaf
+ * @param particleIndexes indexes of particles currently computed
+ * @param sourceCell array of the neighbors source cells
+ * @param sourceParticleIndexes array of indices of source particles currently computed
+ * @param sourceNbPart array containing the number of part in each neighbors
+ * @param userData datas specific to the user's kernel
+ */
+typedef void (*Callback_P2PFull)(int nbParticles, const int* particleIndexes,
+                                 const int * sourceParticleIndexes[27],int sourceNbPart[27], void* userData);
+
+
 /**
  * @brief Function to be filled by user's P2P inside the leaf
  * @param nbParticles number of particle in current leaf
@@ -433,9 +455,11 @@ typedef struct User_Scalfmm_Kernel_Descriptor {
     Callback_P2M p2m;
     Callback_M2M m2m;
     Callback_M2L m2l;
+    Callback_M2LFull m2l_full;
     Callback_L2L l2l;
     Callback_L2P l2p;
     Callback_P2P p2p;
+    Callback_P2PFull p2p_full;
     Callback_P2PInner p2pinner;
 }Scalfmm_Kernel_Descriptor;
 

Addons/CKernelApi/Src/FInterEngine.hpp

@@ -187,8 +187,6 @@ public:
                     forcesToFill[indexes[idxPart]*3+0] = sources->getForcesX()[idxPart];
                     forcesToFill[indexes[idxPart]*3+1] = sources->getForcesY()[idxPart];
                     forcesToFill[indexes[idxPart]*3+2] = sources->getForcesZ()[idxPart];
-                    printf("forces found : %e,%e,%e\n",
-                           sources->getForcesX()[idxPart],sources->getForcesY()[idxPart],sources->getForcesZ()[idxPart]);
                 }
             });
     }

Addons/CKernelApi/Src/FScalFMMEngine.hpp

@@ -31,10 +31,12 @@
 #include "Components/FSimpleLeaf.hpp"
 #include "Kernels/P2P/FP2PParticleContainerIndexed.hpp"
 
-//For lagrange interpolation
-#include "Kernels/Uniform/FUnifCell.hpp"
+//For interpolation
 #include "Kernels/Interpolation/FInterpMatrixKernel.hpp"
-#include "Kernels/Uniform/FUnifKernel.hpp"
+
+//For lagrange interpolation
+// #include "Kernels/Uniform/FUnifCell.hpp"
+// #include "Kernels/Uniform/FUnifKernel.hpp"
 
 //For chebyshev Interpolation
 #include "Kernels/Chebyshev/FChebCell.hpp"

Addons/CKernelApi/Src/FScalfmmApiInit.cpp

@@ -24,16 +24,16 @@ extern "C" scalfmm_handle scalfmm_init(/*int TreeHeight,double BoxWidth,double*
 
         handle->engine = new FInterEngine<ChebCell,ChebKernel>(/*TreeHeight,BoxWidth,BoxCenter, */KernelType);
         break;
-    case 2:
-        //TODO typedefs
-        typedef FP2PParticleContainerIndexed<>                                 ContainerClass;
-        typedef FUnifCell<7>                                                         UnifCell;
+    // case 2:
+    //     //TODO typedefs
+    //     typedef FP2PParticleContainerIndexed<>                                 ContainerClass;
+    //     typedef FUnifCell<7>                                                         UnifCell;
 
-        typedef FInterpMatrixKernelR                                        MatrixKernelClass;
-        typedef FUnifKernel<UnifCell,ContainerClass,MatrixKernelClass,7>           UnifKernel;
+    //     typedef FInterpMatrixKernelR                                        MatrixKernelClass;
+    //     typedef FUnifKernel<UnifCell,ContainerClass,MatrixKernelClass,7>           UnifKernel;
 
-        handle->engine = new FInterEngine<UnifCell,UnifKernel>(/*TreeHeight,BoxWidth,BoxCenter, */KernelType);
-        break;
+    //     handle->engine = new FInterEngine<UnifCell,UnifKernel>(/*TreeHeight,BoxWidth,BoxCenter, */KernelType);
+    //     break;
 
     default:
         std::cout<< "Kernel type unsupported" << std::endl;
@@ -48,3 +48,263 @@ extern "C" void scalfmm_dealloc_handle(scalfmm_handle handle, Callback_free_cell
     delete ((ScalFmmCoreHandle *) handle)->engine ;
     delete (ScalFmmCoreHandle *) handle;
 }
+
+/**
+ * This parts implements all the function defined in FChebInterface.h
+ * using the Chebyshev classes
+ */
+#ifndef CHEBINTERFACE_HPP
+#define CHEBINTERFACE_HPP
+extern "C" {
+#include "Kernels/Chebyshev/FChebInterface.h"
+}
+
+
+#include "Kernels/P2P/FP2PParticleContainerIndexed.hpp"
+#include "Components/FSimpleLeaf.hpp"
+
+
+typedef struct FChebCell_struct{
+    //Store what's needed
+    FChebCell<7> * cell;
+    long long int index;
+}ChebCellStruct;
+
+
+//How to create/destroy cells
+extern "C" ChebCellStruct * ChebCellStruct_create(long long int inIndex,int * position){
+    ChebCellStruct * newCell = new ChebCellStruct();
+    newCell->index = inIndex;
+    newCell->cell = new FChebCell<7>();
+    newCell->cell->setMortonIndex(inIndex);
+    newCell->cell->setCoordinate(position[0],position[1],position[2]);
+    return newCell;
+}
+
+extern "C" void ChebCellStruct_free(ChebCellStruct * inCell){
+    if(inCell->cell) {
+        delete inCell->cell;
+    }
+    delete inCell;
+}
+
+
+
+typedef struct FChebKernel_struct{
+    //Be ready full duplication go there !!!
+    FChebSymKernel<FChebCell<7>,FP2PParticleContainerIndexed<>,FInterpMatrixKernelR,7> * kernel;
+    FInterpMatrixKernelR * matrix;
+} ChebKernelStruct;
+
+//Kernel functions
+extern "C" ChebKernelStruct * ChebKernelStruct_create(int inTreeHeight,
+                                                      double inBoxWidth,
+                                                      double* inBoxCenter){
+
+    ChebKernelStruct * newKernel = new ChebKernelStruct();
+    newKernel->matrix= new FInterpMatrixKernelR();
+    newKernel->kernel =
+        new FChebSymKernel<FChebCell<7>,FP2PParticleContainerIndexed<>,
+                           FInterpMatrixKernelR,7>(inTreeHeight,
+                                                   inBoxWidth,
+                                                   FPoint(inBoxCenter[0],inBoxCenter[1],inBoxCenter[2]),
+                                                   newKernel->matrix);
+    return newKernel;
+}
+
+extern "C" void ChebKernelStruct_free(void *inKernel){
+    delete reinterpret_cast<ChebKernelStruct *>(inKernel)->matrix;
+    delete reinterpret_cast<ChebKernelStruct *>(inKernel)->kernel;
+    delete reinterpret_cast<ChebKernelStruct *>(inKernel);
+}
+
+
+extern "C" void ChebKernel_P2M(void * leafCell, int nbParticles, const int *particleIndexes, void * inKernel){
+    //make temporary array of parts
+    FP2PParticleContainerIndexed<>* tempContainer = new FP2PParticleContainerIndexed<>();
+    tempContainer->reserve(nbParticles);
+    FPoint pos;
+    for(int i=0 ; i<nbParticles ; ++i){
+        pos = FPoint(reinterpret_cast<UserData *>(inKernel)->insertedPositions[particleIndexes[i]*3  ],
+                     reinterpret_cast<UserData *>(inKernel)->insertedPositions[particleIndexes[i]*3+1],
+                     reinterpret_cast<UserData *>(inKernel)->insertedPositions[particleIndexes[i]*3+2]);
+        double Phi = reinterpret_cast<UserData *>(inKernel)->myPhyValues[particleIndexes[i]];
+
+        tempContainer->push(pos,particleIndexes[i],Phi);
+    }
+    //get the real cell struct
+    ChebCellStruct * realCellStruct = reinterpret_cast<ChebCellStruct *>(leafCell);
+    FChebCell<7> * realCell = realCellStruct->cell;
+
+    //get the real chebyshev struct
+    UserData * userDataKernel = reinterpret_cast<UserData *>(inKernel);
+    ChebKernelStruct * realKernel = userDataKernel->kernelStruct;
+
+    realKernel->kernel->P2M(realCell, tempContainer);
+    delete tempContainer;
+}
+
+extern "C" void  ChebKernel_M2M(int level, void* parentCell, int childPosition, void *childCell, void *inKernel){
+    //Get our structures
+    ChebCellStruct * parentCellStruct = reinterpret_cast<ChebCellStruct *>(parentCell);
+    ChebCellStruct * childCellStruct = reinterpret_cast<ChebCellStruct *>(childCell);
+    //get real cheb cell
+    FChebCell<7>* parentChebCell = parentCellStruct->cell;
+    FChebCell<7>* childChebCell = childCellStruct->cell;
+
+    //Get the kernel
+    ChebKernelStruct * inKernelStruct = reinterpret_cast<UserData*>(inKernel)->kernelStruct;
+    inKernelStruct->kernel->getPtrToInterpolator()->applyM2M(childPosition,
+                                                             childChebCell->getMultipole(0),
+                                                             parentChebCell->getMultipole(0));
+}
+
+extern "C" void ChebKernel_M2L(int level, void* targetCell,  void* sourceCell[343], void* inKernel){
+    //Get our structures
+    ChebCellStruct * targetCellStruct = reinterpret_cast<ChebCellStruct *>(targetCell);
+    //get real cheb cell
+    FChebCell<7>* const targetChebCell = targetCellStruct->cell;
+
+    //copy to an array of FChebCell
+    const FChebCell<7>* arrayOfChebCell[343];
+    for(int i=0; i<343 ; ++i){
+        if(sourceCell[i] != nullptr){
+            arrayOfChebCell[i] = reinterpret_cast<ChebCellStruct*>(sourceCell[i])->cell;
+        }
+        else{
+            arrayOfChebCell[i] = nullptr;
+        }
+    }
+    //Get the kernel
+    ChebKernelStruct * inKernelStruct = reinterpret_cast<UserData*>(inKernel)->kernelStruct;
+    inKernelStruct->kernel->M2L(targetChebCell,arrayOfChebCell,0,level);
+}
+
+extern "C" void ChebKernel_L2L(int level, void* parentCell, int childPosition, void* childCell, void* inKernel){
+   //Get our structures
+    ChebCellStruct * parentCellStruct = reinterpret_cast<ChebCellStruct *>(parentCell);
+    ChebCellStruct * childCellStruct = reinterpret_cast<ChebCellStruct *>(childCell);
+    //get real cheb cell
+    FChebCell<7>* parentChebCell = parentCellStruct->cell;
+    FChebCell<7>* childChebCell = childCellStruct->cell;
+
+    //Get the kernel
+    ChebKernelStruct * inKernelStruct = reinterpret_cast<UserData*>(inKernel)->kernelStruct;
+    inKernelStruct->kernel->getPtrToInterpolator()->applyL2L(childPosition,
+                                                             parentChebCell->getLocal(0),
+                                                             childChebCell->getLocal(0));
+}
+
+extern "C" void ChebKernel_L2P(void* leafCell, int nbParticles, const int* particleIndexes, void* inKernel){
+    //Create temporary FSimpleLeaf
+    FP2PParticleContainerIndexed<>* tempContainer = new FP2PParticleContainerIndexed<>();
+    tempContainer->reserve(nbParticles);
+    FPoint pos;
+    for(int i=0 ; i<nbParticles ; ++i){
+        pos = FPoint(reinterpret_cast<UserData *>(inKernel)->insertedPositions[particleIndexes[i]*3  ],
+                            reinterpret_cast<UserData *>(inKernel)->insertedPositions[particleIndexes[i]*3+1],
+                            reinterpret_cast<UserData *>(inKernel)->insertedPositions[particleIndexes[i]*3+2]);
+        double Phi = reinterpret_cast<UserData *>(inKernel)->myPhyValues[particleIndexes[i]];
+        tempContainer->push(pos,particleIndexes[i],Phi);
+    }
+    //Get our structures
+    ChebCellStruct * leafCellStruct = reinterpret_cast<ChebCellStruct *>(leafCell);
+    //get real cheb cell
+    FChebCell<7>* leafChebCell = leafCellStruct->cell;
+
+    //Get the kernel
+    ChebKernelStruct * inKernelStruct = reinterpret_cast<UserData*>(inKernel)->kernelStruct;
+
+    inKernelStruct->kernel->L2P(leafChebCell,tempContainer);
+
+    //Then retrieve the results
+    double * forcesToFill = reinterpret_cast<UserData *>(inKernel)->forcesComputed;
+    const FVector<int>& indexes = tempContainer->getIndexes();
+    for(int idxPart = 0 ; idxPart<nbParticles ; ++idxPart){
+        forcesToFill[indexes[idxPart]*3+0] += tempContainer->getForcesX()[idxPart];
+        forcesToFill[indexes[idxPart]*3+1] += tempContainer->getForcesY()[idxPart];
+        forcesToFill[indexes[idxPart]*3+2] += tempContainer->getForcesZ()[idxPart];
+    }
+
+    delete tempContainer;
+    tempContainer=nullptr;
+}
+
+
+void ChebKernel_P2P(int nbParticles, const int* particleIndexes,
+                    const int * sourceParticleIndexes[27],int sourceNbPart[27],void* inKernel){
+    //Create temporary FSimpleLeaf for target
+    FP2PParticleContainerIndexed<>* tempContTarget = new FP2PParticleContainerIndexed<>();
+    tempContTarget->reserve(nbParticles);
+    for(int i=0 ; i<nbParticles ; ++i){
+        FPoint pos = FPoint(reinterpret_cast<UserData *>(inKernel)->insertedPositions[particleIndexes[i]*3  ],
+                            reinterpret_cast<UserData *>(inKernel)->insertedPositions[particleIndexes[i]*3+1],
+                            reinterpret_cast<UserData *>(inKernel)->insertedPositions[particleIndexes[i]*3+2]);
+        double Phi = reinterpret_cast<UserData *>(inKernel)->myPhyValues[particleIndexes[i]];
+        tempContTarget->push(pos,particleIndexes[i],Phi);
+    }
+
+    //Create 27 FSimpleLeaf for 27 sources
+    FP2PParticleContainerIndexed<>* tempContSources[27];
+    for(int idSource=0; idSource<27 ; ++idSource){
+        if(sourceNbPart[idSource] != 0){
+            //Create container
+            tempContSources[idSource] = new FP2PParticleContainerIndexed<>();
+            //Allocate memory
+            tempContSources[idSource]->reserve(sourceNbPart[idSource]);
+            //Store a ptr to the indices of that source leaf
+            const int * indSource = sourceParticleIndexes[idSource];
+            //Then, for each part in this source
+            for(int i=0 ; i<sourceNbPart[idSource] ; ++i){
+                FPoint pos = FPoint(reinterpret_cast<UserData *>(inKernel)->insertedPositions[indSource[i]*3  ],
+                                    reinterpret_cast<UserData *>(inKernel)->insertedPositions[indSource[i]*3+1],
+                                    reinterpret_cast<UserData *>(inKernel)->insertedPositions[indSource[i]*3+2]);
+                double Phi = reinterpret_cast<UserData *>(inKernel)->myPhyValues[indSource[i]];
+                tempContSources[idSource]->push(pos,indSource[i],Phi);
+            }
+        }
+        else{
+            tempContSources[idSource] = nullptr;
+        }
+    }
+    //Everything is fine, now, call Chebyshev P2P
+
+    //Get the kernel
+    ChebKernelStruct * inKernelStruct = reinterpret_cast<UserData*>(inKernel)->kernelStruct;
+
+    //Empty tree coordinate
+    int coord[3] = {0,0,0};
+
+    inKernelStruct->kernel->P2P(FTreeCoordinate(coord),tempContTarget,nullptr,tempContSources,0);
+
+    //get back forces
+    double * forcesToFill = reinterpret_cast<UserData *>(inKernel)->forcesComputed;
+    const FVector<int>& indexes = tempContTarget->getIndexes();
+    for(int idxPart = 0 ; idxPart<nbParticles ; ++idxPart){
+        forcesToFill[indexes[idxPart]*3+0] += tempContTarget->getForcesX()[idxPart];
+        forcesToFill[indexes[idxPart]*3+1] += tempContTarget->getForcesY()[idxPart];
+        forcesToFill[indexes[idxPart]*3+2] += tempContTarget->getForcesZ()[idxPart];
+    }
+
+    //Note that sources are also modified.
+    //get back sources forces
+    for(int idSource = 0 ; idSource < 27 ; ++idSource){
+        const FVector<int>& indexes = tempContSources[idSource]->getIndexes();
+        const int nbPartInSource = sourceNbPart[idSource];
+        for(int idxSourcePart = 0; idxSourcePart < nbPartInSource ; ++idxSourcePart){
+            forcesToFill[indexes[idxSourcePart]*3+0] += tempContSources[idSource]->getForcesX()[idxSourcePart];
+            forcesToFill[indexes[idxSourcePart]*3+1] += tempContSources[idSource]->getForcesY()[idxSourcePart];
+            forcesToFill[indexes[idxSourcePart]*3+2] += tempContSources[idSource]->getForcesZ()[idxSourcePart];
+        }
+    }
+
+    //Release memory
+    for(int idSource=0; idSource<27 ; ++idSource){
+        if(tempContSources[idSource]) delete tempContSources[idSource];
+    }
+    delete tempContTarget;
+}
+
+
+
+#endif

Addons/CKernelApi/Src/FUserKernelEngine.hpp

@@ -72,6 +72,7 @@ public:
     void* getContainer() const {
         return userData;
     }
+
 };
 
 /**
@@ -115,10 +116,25 @@ public:
 
     /** Do nothing */
     virtual void M2L(CellClass* const FRestrict cell, const CellClass* interactions[], const int , const int level) {
-        if(kernel.m2l){
-            for(int idx = 0 ; idx < 343 ; ++idx){
-                if( interactions[idx] ){
-                    kernel.m2l(level, cell->getContainer(), idx, interactions[idx]->getContainer(), userData);
+        if(kernel.m2l_full){//all 343 interactions will be computed directly
+            //First, copy the fmm cell inside an array of user cells
+            void * userCellArray[343];
+            for(int i=0 ; i<343 ; ++i){
+                if(interactions[i] != nullptr){
+                    userCellArray[i] = interactions[i]->getContainer();
+                }
+                else{
+                    userCellArray[i] = nullptr;
+                }
+            }
+            kernel.m2l_full(level,cell->getContainer(),userCellArray,userData);
+        }
+        else{
+            if(kernel.m2l){
+                for(int idx = 0 ; idx < 343 ; ++idx){
+                    if( interactions[idx] ){
+                        kernel.m2l(level, cell->getContainer(), idx, interactions[idx]->getContainer(), userData);
+                    }
                 }
             }
         }
@@ -147,11 +163,27 @@ public:
                      ContainerClass* const neighbors[27], const int ){
         if(kernel.p2pinner) kernel.p2pinner(targets->getNbParticles(), targets->getIndexes().data(), userData);
 
+        if(kernel.p2p_full){
+            //Create the arrays of size and indexes
+            int nbPartPerNeighbors[27];
+            const int * indicesPerNeighbors[27];
+            for(int idx=0 ; idx<27 ; ++idx){
+                if(neighbors[idx]){
+                    nbPartPerNeighbors[idx] = neighbors[idx]->getNbParticles();
+                    indicesPerNeighbors[idx] = neighbors[idx]->getIndexes().data();
+                }
+                else{
+                    nbPartPerNeighbors[idx] = 0;
+                    indicesPerNeighbors[idx] = nullptr;
+                }
+            }
+            kernel.p2p_full(targets->getNbParticles(),targets->getIndexes().data(),indicesPerNeighbors,nbPartPerNeighbors,userData);
+        }
         if(kernel.p2p){
             for(int idx = 0 ; idx < 27 ; ++idx){
                 if( neighbors[idx] ){
                     kernel.p2p(targets->getNbParticles(), targets->getIndexes().data(),
-                                    neighbors[idx]->getNbParticles(), neighbors[idx]->getIndexes().data(), userData);
+                               neighbors[idx]->getNbParticles(), neighbors[idx]->getIndexes().data(), userData);
                 }
             }
         }
@@ -200,12 +232,14 @@ public:
 
     ~FUserKernelEngine(){
         delete octree;
-
+        octree=nullptr;
         if(arranger){
             delete arranger;
+            arranger=nullptr;
         }
         if(kernel){
             delete kernel;
+            kernel=nullptr;
         }
     }
 
@@ -233,6 +267,7 @@ public:
             octree->insert(FPoint(&XYZ[3*idPart]),idPart);
         }
         nbPart += NbPositions;
+        this->init_cell();
     }
 
     /**
@@ -389,8 +424,6 @@ public:
         }
     }
 
-
-
     /*
      * Call the user allocator on userDatas member field of each cell
      */
@@ -422,6 +455,7 @@ public:
         octree->forEachCell([&](CoreCell * currCell){
                 if(currCell->getContainer()){
                     user_cell_deallocator(currCell->getContainer());
+                    currCell->setContainer(nullptr);
                 }
             });
     }

Addons/CKernelApi/Tests/testChebInterface.c

+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+//For timing monitoring
+#include <time.h>
+#include <sys/time.h>
+
+#include "../Src/CScalfmmApi.h"
+
+#include "../../Src/Kernels/Chebyshev/FChebInterface.h"
+
+/**
+ * This file is an example of the user defined kernel API, with link
+ * to our Chebyshev Kernel
+ **/
+
+/**
+ * @brief Wrapper to init internal ChebCell
+ */
+void* cheb_init_cell(int level, long long morton_index, int* tree_position, double* spatial_position){
+    return ChebCellStruct_create(morton_index,tree_position);
+}
+
+/**
+ * @brief Wrapper to free internal ChebCell
+ */
+void cheb_free_cell(void * inCell){
+    ChebCellStruct_free(inCell);
+}
+
+/**
+ * @brief Wrapper to FMM operators (refer to CScalfmmApi.h to get the
+ * detailed descriptions)
+ */
+void cheb_p2m(void* cellData, int nbParticlesInLeaf, const int* particleIndexes, void* userData){
+    ChebKernel_P2M(cellData,nbParticlesInLeaf,particleIndexes,userData);
+}
+void cheb_m2m(int level, void* parentCell, int childPosition, void* childCell, void* userData){
+    ChebKernel_M2M(level,parentCell,childPosition,childCell,userData);
+}
+void cheb_m2l_full(int level, void* targetCell, void* sourceCell[343], void* userData){
+    ChebKernel_M2L(level, targetCell, sourceCell, userData);
+}
+void cheb_l2l(int level, void* parentCell, int childPosition, void* childCell, void* userData){
+    ChebKernel_L2L( level, parentCell, childPosition, childCell,  userData);
+}
+void cheb_l2p(void* leafCell, int nbParticles, const int* particleIndexes, void* userData){
+    ChebKernel_L2P( leafCell, nbParticles, particleIndexes, userData);
+}
+void cheb_p2pFull(int nbParticles, const int* particleIndexes,
+                  const int * sourceParticleIndexes[27], int sourceNbPart[27],void* userData) {
+    ChebKernel_P2P(nbParticles, particleIndexes, sourceParticleIndexes, sourceNbPart, userData);
+}
+
+
+/**
+ * @brief Wrapper on timeval struct
+ */
+typedef struct timer{
+    struct timeval start;
+    struct timeval end;
+}Timer;
+
+/**
+ * @brief monitoring function (init start)
+ */
+void tic(Timer* inTimer){
+    gettimeofday(&inTimer->start, NULL);
+}
+
+/**
+ * @brief monitoring function (init end)
+ */
+void tac(Timer* inTimer){
+    gettimeofday(&inTimer->end, NULL);
+}
+
+/**
+ * @brief monitoring function (return elapsed time in micro second)
+ */
+long int get_elapsed(Timer* inTimer){
+    return ((inTimer->end.tv_sec * 1000000 + inTimer->end.tv_usec)
+            - (inTimer->start.tv_sec * 1000000 + inTimer->start.tv_usec));
+}
+
+/**
+ * @brief monitoring function (print elapsed)
+ */
+void print_elapsed(Timer* inTimer){
+    long int elapsed = get_elapsed(inTimer);
+    printf("Elapsed : %ld us (or %f seconds)\n",elapsed,elapsed/1000000.0);
+}
+
+/**
+ * @brief monitoring function (print difference :: First-Second)
+ */
+void print_difference_elapsed(Timer* inTimer1,Timer*inTimer2){
+    long int diff = get_elapsed(inTimer1)-get_elapsed(inTimer2);
+    printf("Timer Difference : %ld us (or %f seconds)\n",diff,(double)diff/1000000.0);
+}
+
+
+/**
+ * @brief Do everything
+ * @param number of particle (no default value)
+ */
+int main(int argc, char ** av){
+    omp_set_num_threads(1);
+    printf("Start\n");
+    if(argc<2){
+        printf("Use : %s nb_part\n exiting\n",av[0]);
+        exit(0);
+    }
+    int nbPart= atoi(av[1]);
+    double* particleXYZ = malloc(sizeof(double)*3*nbPart);
+    double* physicalValues = malloc(sizeof(double)*nbPart);
+
+    int treeHeight = 5;