ExaFMM 1
Fast-multipole Method for exascale systems
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00001 /* 00002 Copyright (C) 2011 by Rio Yokota, Simon Layton, Lorena Barba 00003 00004 Permission is hereby granted, free of charge, to any person obtaining a copy 00005 of this software and associated documentation files (the "Software"), to deal 00006 in the Software without restriction, including without limitation the rights 00007 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 00008 copies of the Software, and to permit persons to whom the Software is 00009 furnished to do so, subject to the following conditions: 00010 00011 The above copyright notice and this permission notice shall be included in 00012 all copies or substantial portions of the Software. 00013 00014 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 00015 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 00016 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 00017 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 00018 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 00019 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 00020 THE SOFTWARE. 00021 */ 00022 #include "parallelfmm.h" 00023 #ifdef VTK 00024 #include "vtk.h" 00025 #endif 00026 00027 int main() { 00028 const int numBodies = 10000; 00029 const int numTarget = 100; 00030 IMAGES = 0; 00031 THETA = 1 / sqrtf(4); 00032 Bodies bodies(numBodies); 00033 Bodies jbodies; 00034 Cells cells, jcells; 00035 ParallelFMM<Laplace> FMM; 00036 FMM.initialize(); 00037 if( MPIRANK == 0 ) FMM.printNow = true; 00038 00039 FMM.startTimer("Set bodies "); 00040 FMM.random(bodies,MPIRANK+1); 00041 FMM.stopTimer("Set bodies ",FMM.printNow); 00042 00043 FMM.startTimer("Set domain "); 00044 FMM.setGlobDomain(bodies); 00045 FMM.stopTimer("Set domain ",FMM.printNow); 00046 00047 FMM.octsection(bodies); 00048 00049 #ifdef TOPDOWN 00050 FMM.topdown(bodies,cells); 00051 #else 00052 FMM.bottomup(bodies,cells); 00053 #endif 00054 00055 FMM.commBodies(cells); 00056 00057 jbodies = bodies; 00058 jcells = cells; 00059 FMM.commCells(jbodies,jcells); 00060 00061 FMM.startTimer("Downward "); 00062 FMM.downward(cells,jcells); 00063 FMM.stopTimer("Downward ",FMM.printNow); 00064 FMM.eraseTimer("Downward "); 00065 00066 #ifndef VTK 00067 if( IMAGES != 0 ) { 00068 FMM.startTimer("Set periodic "); 00069 jbodies = FMM.periodicBodies(bodies); 00070 FMM.stopTimer("Set periodic ",FMM.printNow); 00071 FMM.eraseTimer("Set periodic "); 00072 } else { 00073 jbodies = bodies; 00074 } 00075 FMM.startTimer("Direct sum "); 00076 Bodies bodies2 = bodies; 00077 bodies2.resize(numTarget); 00078 FMM.initTarget(bodies2); 00079 for( int i=0; i!=MPISIZE; ++i ) { 00080 FMM.shiftBodies(jbodies); 00081 FMM.evalP2P(bodies2,jbodies); 00082 if(FMM.printNow) std::cout << "Direct loop : " << i+1 << "/" << MPISIZE << std::endl; 00083 } 00084 FMM.stopTimer("Direct sum ",FMM.printNow); 00085 #endif 00086 00087 FMM.resetTimer(); 00088 FMM.initTarget(bodies); 00089 FMM.evalP2M(cells); 00090 FMM.evalM2M(cells,cells); 00091 FMM.updateBodies(); 00092 jbodies = bodies; 00093 jcells = cells; 00094 FMM.commCells(jbodies,jcells); 00095 FMM.downward(cells,jcells); 00096 if(FMM.printNow) FMM.writeTime(); 00097 if(FMM.printNow) FMM.writeTime(); 00098 00099 #ifndef VTK 00100 real diff1 = 0, norm1 = 0, diff2 = 0, norm2 = 0, diff3 = 0, norm3 = 0, diff4 = 0, norm4 = 0; 00101 bodies.resize(numTarget); 00102 FMM.evalError(bodies,bodies2,diff1,norm1,diff2,norm2); 00103 MPI_Datatype MPI_TYPE = FMM.getType(diff1); 00104 MPI_Reduce(&diff1,&diff3,1,MPI_TYPE,MPI_SUM,0,MPI_COMM_WORLD); 00105 MPI_Reduce(&norm1,&norm3,1,MPI_TYPE,MPI_SUM,0,MPI_COMM_WORLD); 00106 MPI_Reduce(&diff2,&diff4,1,MPI_TYPE,MPI_SUM,0,MPI_COMM_WORLD); 00107 MPI_Reduce(&norm2,&norm4,1,MPI_TYPE,MPI_SUM,0,MPI_COMM_WORLD); 00108 if(FMM.printNow) FMM.printError(diff3,norm3,diff4,norm4); 00109 00110 #else 00111 for( B_iter B=jbodies.begin(); B!=jbodies.end(); ++B ) B->ICELL = 0; 00112 for( C_iter C=jcells.begin(); C!=jcells.end(); ++C ) { 00113 Body body; 00114 body.ICELL = 1; 00115 body.X = C->X; 00116 body.SRC = 0; 00117 jbodies.push_back(body); 00118 } 00119 00120 int Ncell = 0; 00121 vtkPlot vtk; 00122 if( MPIRANK == 0 ) { 00123 vtk.setDomain(FMM.getR0(),FMM.getX0()); 00124 vtk.setGroupOfPoints(jbodies,Ncell); 00125 } 00126 for( int i=1; i!=MPISIZE; ++i ) { 00127 FMM.shiftBodies(jbodies); 00128 if( MPIRANK == 0 ) { 00129 vtk.setGroupOfPoints(jbodies,Ncell); 00130 } 00131 } 00132 if( MPIRANK == 0 ) { 00133 vtk.plot(Ncell); 00134 } 00135 #endif 00136 FMM.finalize(); 00137 }