mdtools/mpi_implementation/mpiSimulation.cpp

i#include <cstdlib>
#include <cstring>
#include <mpi.h>

#include "mpiSimulation.hpp"
#include "simError.h"


mpiSimulation::mpiSimulation(SimInfo* the_entryPlug)
{
  entryPlug = the_entryPlug;
  
  numberProcessors = MPI::COMM_WORLD.Get_size();
  myNode = worldRank;
  
  // let the simulation know were there.
  entryPlug->mpiSim = this;
}


mpiSimulation::~mpiSimulation(){
  
  // empty for now
  
}


void mpiSimulation::divideLabor( void ){

  int nComponents;
  MoleculeStamp** compStamps;
  int* componentsNmol;

  double numerator;
  double denominator;
  double precast;

  int nTarget;
  int molIndex, atomIndex, compIndex, compStart;
  int done;
  int nLocal, molLocal;
  int i;
  int smallDiff, bigDiff;

  int testSum;

  nComponents = entryPlug->nComponents;
  compStamps = entryPlug->compStamps;
  componentsNmol = entryPlug->componentsNmol;

  numerator = (double) entryPlug->n_atoms;
  denominator = (double) numberProcessors;
  precast = numerator / denominator;
  nTarget = (int)( precast + 0.5 );
  
  molIndex = 0;
  atomIndex = 0;
  compIndex = 0;
  compStart = 0;
  for( i=0; i<(numberProcessors-1); i++){
    
    done = 0;
    nLocal = 0;
    molLocal = 0;

    if( i == myNode ){
      myMolStart = molIndex;
      myAtomStart = atomIndex;
    }
    
    while( !done ){
      
      if( (molIndex-compStart) >= componentsNmol[compIndex] ){
        compStart = molIndex;
        compIndex++;
        continue;
      }

      nLocal += compStamps[compIndex]->getNAtoms();
      atomIndex += compStamps[compIndex]->getNAtoms();
      molIndex++;
      molLocal++;
      
      if ( nLocal == nTarget ) done = 1;
      
      else if( nLocal < nTarget ){
        smallDiff = nTarget - nLocal;
      }
      else if( nLocal > nTarget ){
        bigDiff = nLocal - nTarget;
        
        if( bigDiff < smallDiff ) done = 1;
        else{
          molIndex--;
          molLocal--;
          atomIndex -= compStamps[compIndex]->getNAtoms();
          nLocal -= compStamps[compIndex]->getNAtoms();
          done = 1;
        }
      }
    }
    
    if( i == myNode ){
      myMolEnd = (molIndex - 1);
      myAtomEnd = (atomIndex - 1);
      myNlocal = nLocal;
      myMol = molLocal;
    }
    
    numerator = (double)( entryPlug->n_atoms - atomIndex );
    denominator = (double)( numberProcessors - (i+1) );
    precast = numerator / denominator;
    nTarget = (int)( precast + 0.5 );
  }
  
  if( myNode == numberProcessors-1 ){
      myMolStart = molIndex;
      myAtomStart = atomIndex;

      nLocal = 0;
      molLocal = 0;
      while( compIndex < nComponents ){
        
        if( (molIndex-compStart) >= componentsNmol[compIndex] ){
          compStart = molIndex;
          compIndex++;
          continue;
        }

        nLocal += compStamps[compIndex]->getNAtoms();
        atomIndex += compStamps[compIndex]->getNAtoms();
        molIndex++;
        molLocal++;
      }
      
      myMolEnd = (molIndex - 1);
      myAtomEnd = (atomIndex - 1);
      myNlocal = nLocal;  
      myMol = molLocal;
  }


  MPI_Allreduce( &Nlocal, &testSum, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD );
  
  if( myNode == 0 ){
    if( testSum != entryPlug->n_atoms ){
      sprintf( painCave.errMsg,
               "The summ of all nLocals, %d, did not equal the total number of atoms, %d.\n",
               testSum, entryPlug->n_atoms );
      painCave.isFatal = 1;
      simError();
    }
  }

  sprintf( checkPointMsg,
           "Successfully divided the molecules among the processors.\n" );
  MPIcheckPoint();

  // lets create the identity array
}
Revision:	200
Committed:	Mon Dec 9 20:54:42 2002 UTC (22 years, 4 months ago) by mmeineke
File size:	3390 byte(s)
Log Message:	* empty log message *
#	Content
1	i#include <cstdlib>
2	#include <cstring>
3	#include <mpi.h>
4
5	#include "mpiSimulation.hpp"
6	#include "simError.h"
7
8
9
10	mpiSimulation::mpiSimulation(SimInfo* the_entryPlug)
11	{
12	entryPlug = the_entryPlug;
13
14	numberProcessors = MPI::COMM_WORLD.Get_size();
15	myNode = worldRank;
16
17	// let the simulation know were there.
18	entryPlug->mpiSim = this;
19	}
20
21
22	mpiSimulation::~mpiSimulation(){
23
24	// empty for now
25
26	}
27
28
29	void mpiSimulation::divideLabor( void ){
30
31	int nComponents;
32	MoleculeStamp** compStamps;
33	int* componentsNmol;
34
35	double numerator;
36	double denominator;
37	double precast;
38
39	int nTarget;
40	int molIndex, atomIndex, compIndex, compStart;
41	int done;
42	int nLocal, molLocal;
43	int i;
44	int smallDiff, bigDiff;
45
46	int testSum;
47
48	nComponents = entryPlug->nComponents;
49	compStamps = entryPlug->compStamps;
50	componentsNmol = entryPlug->componentsNmol;
51
52	numerator = (double) entryPlug->n_atoms;
53	denominator = (double) numberProcessors;
54	precast = numerator / denominator;
55	nTarget = (int)( precast + 0.5 );
56
57	molIndex = 0;
58	atomIndex = 0;
59	compIndex = 0;
60	compStart = 0;
61	for( i=0; i<(numberProcessors-1); i++){
62
63	done = 0;
64	nLocal = 0;
65	molLocal = 0;
66
67	if( i == myNode ){
68	myMolStart = molIndex;
69	myAtomStart = atomIndex;
70	}
71
72	while( !done ){
73
74	if( (molIndex-compStart) >= componentsNmol[compIndex] ){
75	compStart = molIndex;
76	compIndex++;
77	continue;
78	}
79
80	nLocal += compStamps[compIndex]->getNAtoms();
81	atomIndex += compStamps[compIndex]->getNAtoms();
82	molIndex++;
83	molLocal++;
84
85	if ( nLocal == nTarget ) done = 1;
86
87	else if( nLocal < nTarget ){
88	smallDiff = nTarget - nLocal;
89	}
90	else if( nLocal > nTarget ){
91	bigDiff = nLocal - nTarget;
92
93	if( bigDiff < smallDiff ) done = 1;
94	else{
95	molIndex--;
96	molLocal--;
97	atomIndex -= compStamps[compIndex]->getNAtoms();
98	nLocal -= compStamps[compIndex]->getNAtoms();
99	done = 1;
100	}
101	}
102	}
103
104	if( i == myNode ){
105	myMolEnd = (molIndex - 1);
106	myAtomEnd = (atomIndex - 1);
107	myNlocal = nLocal;
108	myMol = molLocal;
109	}
110
111	numerator = (double)( entryPlug->n_atoms - atomIndex );
112	denominator = (double)( numberProcessors - (i+1) );
113	precast = numerator / denominator;
114	nTarget = (int)( precast + 0.5 );
115	}
116
117	if( myNode == numberProcessors-1 ){
118	myMolStart = molIndex;
119	myAtomStart = atomIndex;
120
121	nLocal = 0;
122	molLocal = 0;
123	while( compIndex < nComponents ){
124
125	if( (molIndex-compStart) >= componentsNmol[compIndex] ){
126	compStart = molIndex;
127	compIndex++;
128	continue;
129	}
130
131	nLocal += compStamps[compIndex]->getNAtoms();
132	atomIndex += compStamps[compIndex]->getNAtoms();
133	molIndex++;
134	molLocal++;
135	}
136
137	myMolEnd = (molIndex - 1);
138	myAtomEnd = (atomIndex - 1);
139	myNlocal = nLocal;
140	myMol = molLocal;
141	}
142
143
144	MPI_Allreduce( &Nlocal, &testSum, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD );
145
146	if( myNode == 0 ){
147	if( testSum != entryPlug->n_atoms ){
148	sprintf( painCave.errMsg,
149	"The summ of all nLocals, %d, did not equal the total number of atoms, %d.\n",
150	testSum, entryPlug->n_atoms );
151	painCave.isFatal = 1;
152	simError();
153	}
154	}
155
156	sprintf( checkPointMsg,
157	"Successfully divided the molecules among the processors.\n" );
158	MPIcheckPoint();
159
160	// lets create the identity array
161	}