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i#include <cstdlib> |
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#include <cstring> |
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#include <mpi.h> |
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|
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#include "mpiSimulation.hpp" |
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#include "simError.h" |
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|
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|
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|
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mpiSimulation::mpiSimulation(SimInfo* the_entryPlug) |
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{ |
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entryPlug = the_entryPlug; |
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|
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numberProcessors = MPI::COMM_WORLD.Get_size(); |
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myNode = worldRank; |
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|
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// let the simulation know were there. |
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entryPlug->mpiSim = this; |
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} |
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|
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|
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mpiSimulation::~mpiSimulation(){ |
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|
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// empty for now |
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|
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} |
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|
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|
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void mpiSimulation::divideLabor(int nComponents, MoleculeStamp** compStamps, int* componentsNmol ){ |
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|
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double numerator; |
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double denominator; |
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double precast; |
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|
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int nTarget; |
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int molIndex, atomIndex, compIndex, compStart; |
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int done; |
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int nLocal; |
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int i; |
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int smallDiff, bigDiff; |
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|
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int testSum; |
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|
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numerator = (double) entryPlug->n_atoms; |
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denominator = (double) numberProcessors; |
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precast = numerator / denominator; |
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nTarget = (int)( precast + 0.5 ); |
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|
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molIndex = 0; |
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atomIndex = 0; |
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compIndex = 0; |
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compStart = 0; |
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for( i=0; i<(numberProcessors-1); i++){ |
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|
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done = 0; |
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nLocal = 0; |
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|
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if( i == myNode ){ |
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myMolStart = molIndex; |
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myAtomStart = atomIndex; |
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} |
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|
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while( !done ){ |
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|
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if( (molIndex-compStart) >= componentsNmol[compIndex] ){ |
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compStart = molIndex; |
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compIndex++; |
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continue; |
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} |
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|
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nLocal += compStamps[compIndex]->getNAtoms(); |
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atomIndex += compStamps[compIndex]->getNAtoms(); |
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molIndex++; |
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|
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if ( nLocal == nTarget ) done = 1; |
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|
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else if( nLocal < nTarget ){ |
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smallDiff = nTarget - nLocal; |
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} |
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else if( nLocal > nTarget ){ |
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bigDiff = nLocal - nTarget; |
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|
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if( bigDiff < smallDiff ) done = 1; |
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else{ |
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molIndex--; |
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atomIndex -= compStamps[compIndex]->getNAtoms(); |
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nLocal -= compStamps[compIndex]->getNAtoms(); |
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done = 1; |
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} |
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} |
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} |
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|
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if( i == myNode ){ |
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myMolEnd = (molIndex - 1); |
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myAtomEnd = (atomIndex - 1); |
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myNlocal = nLocal; |
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} |
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|
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numerator = (double)( entryPlug->n_atoms - atomIndex ); |
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denominator = (double)( numberProcessors - (i+1) ); |
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precast = numerator / denominator; |
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nTarget = (int)( precast + 0.5 ); |
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} |
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|
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if( myNode == numberProcessors-1 ){ |
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myMolStart = molIndex; |
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myAtomStart = atomIndex; |
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|
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nLocal = 0; |
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while( compIndex < nComponents ){ |
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|
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if( (molIndex-compStart) >= componentsNmol[compIndex] ){ |
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compStart = molIndex; |
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compIndex++; |
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continue; |
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} |
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|
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nLocal += compStamps[compIndex]->getNAtoms(); |
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atomIndex += compStamps[compIndex]->getNAtoms(); |
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molIndex++; |
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} |
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|
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myMolEnd = (molIndex - 1); |
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myAtomEnd = (atomIndex - 1); |
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myNlocal = nLocal; |
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} |
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|
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|
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MPI_Allreduce( &Nlocal, &testSum, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD ); |
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|
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if( myNode == 0 ){ |
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if( testSum != entryPlug->n_atoms ){ |
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sprintf( painCave.errMsg, |
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"The summ of all nLocals, %d, did not equal the total number of atoms, %d.\n", |
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testSum, entryPlug->n_atoms ); |
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painCave.isFatal = 1; |
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simError(); |
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} |
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} |
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|
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sprintf( checkPointMsg, |
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"Successfully divided the molecules among the processors.\n" ); |
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MPIcheckPoint(); |
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} |
