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root/OpenMD/trunk/src/parallel/ForceMatrixDecomposition.cpp

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branches/development/src/parallel/ForceDecomposition.cpp (file contents), Revision 1538 by chuckv, Tue Jan 11 18:58:12 2011 UTC vs.
trunk/src/parallel/ForceMatrixDecomposition.cpp (file contents), Revision 1896 by gezelter, Tue Jul 2 20:02:31 2013 UTC

#	Line 1 | Line 1
1	<	/**
2	<	* @file ForceDecomposition.cpp
3	<	* @author Charles Vardeman <cvardema.at.nd.edu>
4	<	* @date 08/18/2010
5	<	* @time 11:56am
6	<	* @version 1.0
1	>	/*
2	>	* Copyright (c) 2005 The University of Notre Dame. All Rights Reserved.
3		*
8	–	* @section LICENSE
9	–	* Copyright (c) 2010 The University of Notre Dame. All Rights Reserved.
10	–	*
4		* The University of Notre Dame grants you ("Licensee") a
5		* non-exclusive, royalty free, license to use, modify and
6		* redistribute this software in source and binary code form, provided
#	Line 42 | Line 35
35		*
36		* [1]  Meineke, et al., J. Comp. Chem. 26, 252-271 (2005).
37		* [2]  Fennell & Gezelter, J. Chem. Phys. 124, 234104 (2006).
38	<	* [3]  Sun, Lin & Gezelter, J. Chem. Phys. 128, 24107 (2008).
39	<	* [4]  Vardeman & Gezelter, in progress (2009).
38	>	* [3]  Sun, Lin & Gezelter, J. Chem. Phys. 128, 234107 (2008).
39	>	* [4]  Kuang & Gezelter,  J. Chem. Phys. 133, 164101 (2010).
40	>	* [5]  Vardeman, Stocker & Gezelter, J. Chem. Theory Comput. 7, 834 (2011).
41		*/
42	+	#include "parallel/ForceMatrixDecomposition.hpp"
43	+	#include "math/SquareMatrix3.hpp"
44	+	#include "nonbonded/NonBondedInteraction.hpp"
45	+	#include "brains/SnapshotManager.hpp"
46	+	#include "brains/PairList.hpp"
47
48	+	using namespace std;
49	+	namespace OpenMD {
50
51	+	ForceMatrixDecomposition::ForceMatrixDecomposition(SimInfo* info, InteractionManager* iMan) : ForceDecomposition(info, iMan) {
52
53	<	/*  -*- c++ -*-  */
54	<	#include "config.h"
55	<	#include <stdlib.h>
53	>	// In a parallel computation, row and colum scans must visit all
54	>	// surrounding cells (not just the 14 upper triangular blocks that
55	>	// are used when the processor can see all pairs)
56		#ifdef IS_MPI
57	<	#include <mpi.h>
58	<	#endif
57	>	cellOffsets_.clear();
58	>	cellOffsets_.push_back( Vector3i(-1,-1,-1) );
59	>	cellOffsets_.push_back( Vector3i( 0,-1,-1) );
60	>	cellOffsets_.push_back( Vector3i( 1,-1,-1) );
61	>	cellOffsets_.push_back( Vector3i(-1, 0,-1) );
62	>	cellOffsets_.push_back( Vector3i( 0, 0,-1) );
63	>	cellOffsets_.push_back( Vector3i( 1, 0,-1) );
64	>	cellOffsets_.push_back( Vector3i(-1, 1,-1) );
65	>	cellOffsets_.push_back( Vector3i( 0, 1,-1) );
66	>	cellOffsets_.push_back( Vector3i( 1, 1,-1) );
67	>	cellOffsets_.push_back( Vector3i(-1,-1, 0) );
68	>	cellOffsets_.push_back( Vector3i( 0,-1, 0) );
69	>	cellOffsets_.push_back( Vector3i( 1,-1, 0) );
70	>	cellOffsets_.push_back( Vector3i(-1, 0, 0) );
71	>	cellOffsets_.push_back( Vector3i( 0, 0, 0) );
72	>	cellOffsets_.push_back( Vector3i( 1, 0, 0) );
73	>	cellOffsets_.push_back( Vector3i(-1, 1, 0) );
74	>	cellOffsets_.push_back( Vector3i( 0, 1, 0) );
75	>	cellOffsets_.push_back( Vector3i( 1, 1, 0) );
76	>	cellOffsets_.push_back( Vector3i(-1,-1, 1) );
77	>	cellOffsets_.push_back( Vector3i( 0,-1, 1) );
78	>	cellOffsets_.push_back( Vector3i( 1,-1, 1) );
79	>	cellOffsets_.push_back( Vector3i(-1, 0, 1) );
80	>	cellOffsets_.push_back( Vector3i( 0, 0, 1) );
81	>	cellOffsets_.push_back( Vector3i( 1, 0, 1) );
82	>	cellOffsets_.push_back( Vector3i(-1, 1, 1) );
83	>	cellOffsets_.push_back( Vector3i( 0, 1, 1) );
84	>	cellOffsets_.push_back( Vector3i( 1, 1, 1) );
85	>	#endif
86	>	}
87
58	–	#include <iostream>
59	–	#include <vector>
60	–	#include <algorithm>
61	–	#include <cmath>
62	–	#include "parallel/ForceDecomposition.hpp"
88
89	+	/**
90	+	* distributeInitialData is essentially a copy of the older fortran
91	+	* SimulationSetup
92	+	*/
93	+	void ForceMatrixDecomposition::distributeInitialData() {
94	+	snap_ = sman_->getCurrentSnapshot();
95	+	storageLayout_ = sman_->getStorageLayout();
96	+	ff_ = info_->getForceField();
97	+	nLocal_ = snap_->getNumberOfAtoms();
98	+
99	+	nGroups_ = info_->getNLocalCutoffGroups();
100	+	// gather the information for atomtype IDs (atids):
101	+	idents = info_->getIdentArray();
102	+	AtomLocalToGlobal = info_->getGlobalAtomIndices();
103	+	cgLocalToGlobal = info_->getGlobalGroupIndices();
104	+	vector<int> globalGroupMembership = info_->getGlobalGroupMembership();
105
106	<	using namespace std;
66	<	using namespace OpenMD;
106	>	massFactors = info_->getMassFactors();
107
108	<	//__static
108	>	PairList* excludes = info_->getExcludedInteractions();
109	>	PairList* oneTwo = info_->getOneTwoInteractions();
110	>	PairList* oneThree = info_->getOneThreeInteractions();
111	>	PairList* oneFour = info_->getOneFourInteractions();
112	>
113	>	if (needVelocities_)
114	>	snap_->cgData.setStorageLayout(DataStorage::dslPosition |
115	>	DataStorage::dslVelocity);
116	>	else
117	>	snap_->cgData.setStorageLayout(DataStorage::dslPosition);
118	>
119		#ifdef IS_MPI
120	<	static vector<MPI:Comm> communictors;
121	<	#endif
120	>
121	>	MPI::Intracomm row = rowComm.getComm();
122	>	MPI::Intracomm col = colComm.getComm();
123
124	<	//____ MPITypeTraits
125	<	template<typename T>
126	<	struct MPITypeTraits;
124	>	AtomPlanIntRow = new Plan<int>(row, nLocal_);
125	>	AtomPlanRealRow = new Plan<RealType>(row, nLocal_);
126	>	AtomPlanVectorRow = new Plan<Vector3d>(row, nLocal_);
127	>	AtomPlanMatrixRow = new Plan<Mat3x3d>(row, nLocal_);
128	>	AtomPlanPotRow = new Plan<potVec>(row, nLocal_);
129
130	<	#ifdef IS_MPI
131	<	template<>
132	<	struct MPITypeTraits<RealType> {
133	<	static const MPI::Datatype datatype;
134	<	};
82	<	const MPI_Datatype MPITypeTraits<RealType>::datatype = MY_MPI_REAL;
130	>	AtomPlanIntColumn = new Plan<int>(col, nLocal_);
131	>	AtomPlanRealColumn = new Plan<RealType>(col, nLocal_);
132	>	AtomPlanVectorColumn = new Plan<Vector3d>(col, nLocal_);
133	>	AtomPlanMatrixColumn = new Plan<Mat3x3d>(col, nLocal_);
134	>	AtomPlanPotColumn = new Plan<potVec>(col, nLocal_);
135
136	<	template<>
137	<	struct MPITypeTraits<int> {
138	<	static const MPI::Datatype datatype;
139	<	};
88	<	const MPI::Datatype MPITypeTraits<int>::datatype = MPI_INT;
89	<	#endif
136	>	cgPlanIntRow = new Plan<int>(row, nGroups_);
137	>	cgPlanVectorRow = new Plan<Vector3d>(row, nGroups_);
138	>	cgPlanIntColumn = new Plan<int>(col, nGroups_);
139	>	cgPlanVectorColumn = new Plan<Vector3d>(col, nGroups_);
140
141	<	/**
142	<	* Constructor for ForceDecomposition Parallel Decomposition Method
143	<	* Will try to construct a symmetric grid of processors. Ideally, the
144	<	* number of processors will be a square ex: 4, 9, 16, 25.
95	<	*
96	<	*/
141	>	nAtomsInRow_ = AtomPlanIntRow->getSize();
142	>	nAtomsInCol_ = AtomPlanIntColumn->getSize();
143	>	nGroupsInRow_ = cgPlanIntRow->getSize();
144	>	nGroupsInCol_ = cgPlanIntColumn->getSize();
145
146	<	ForceDecomposition::ForceDecomposition() {
146	>	// Modify the data storage objects with the correct layouts and sizes:
147	>	atomRowData.resize(nAtomsInRow_);
148	>	atomRowData.setStorageLayout(storageLayout_);
149	>	atomColData.resize(nAtomsInCol_);
150	>	atomColData.setStorageLayout(storageLayout_);
151	>	cgRowData.resize(nGroupsInRow_);
152	>	cgRowData.setStorageLayout(DataStorage::dslPosition);
153	>	cgColData.resize(nGroupsInCol_);
154	>	if (needVelocities_)
155	>	// we only need column velocities if we need them.
156	>	cgColData.setStorageLayout(DataStorage::dslPosition |
157	>	DataStorage::dslVelocity);
158	>	else
159	>	cgColData.setStorageLayout(DataStorage::dslPosition);
160	>
161	>	identsRow.resize(nAtomsInRow_);
162	>	identsCol.resize(nAtomsInCol_);
163	>
164	>	AtomPlanIntRow->gather(idents, identsRow);
165	>	AtomPlanIntColumn->gather(idents, identsCol);
166	>
167	>	// allocate memory for the parallel objects
168	>	atypesRow.resize(nAtomsInRow_);
169	>	atypesCol.resize(nAtomsInCol_);
170
171	<	#ifdef IS_MPI
172	<	int nProcs = MPI::COMM_WORLD.Get_size();
173	<	int worldRank = MPI::COMM_WORLD.Get_rank();
174	<	#endif
171	>	for (int i = 0; i < nAtomsInRow_; i++)
172	>	atypesRow[i] = ff_->getAtomType(identsRow[i]);
173	>	for (int i = 0; i < nAtomsInCol_; i++)
174	>	atypesCol[i] = ff_->getAtomType(identsCol[i]);
175
176	<	// First time through, construct column stride.
177	<	if (communicators.size() == 0)
107	<	{
108	<	int nColumnsMax = (int) round(sqrt((float) nProcs));
109	<	for (int i = 0; i < nProcs; ++i)
110	<	{
111	<	if (nProcs%i==0) nColumns=i;
112	<	}
176	>	pot_row.resize(nAtomsInRow_);
177	>	pot_col.resize(nAtomsInCol_);
178
179	<	int nRows = nProcs/nColumns;
180	<	myRank_ = (int) worldRank%nColumns;
116	<	}
117	<	else
118	<	{
119	<	myRank_ = myRank/nColumns;
120	<	}
121	<	MPI::Comm newComm = MPI:COMM_WORLD.Split(myRank_,0);
122	<
123	<	isColumn_ = false;
124	<
125	<	}
179	>	expot_row.resize(nAtomsInRow_);
180	>	expot_col.resize(nAtomsInCol_);
181
182	<	ForceDecomposition::gather(sendbuf, receivebuf){
183	<	communicators(myIndex_).Allgatherv();
184	<	}
182	>	AtomRowToGlobal.resize(nAtomsInRow_);
183	>	AtomColToGlobal.resize(nAtomsInCol_);
184	>	AtomPlanIntRow->gather(AtomLocalToGlobal, AtomRowToGlobal);
185	>	AtomPlanIntColumn->gather(AtomLocalToGlobal, AtomColToGlobal);
186	>
187	>	cgRowToGlobal.resize(nGroupsInRow_);
188	>	cgColToGlobal.resize(nGroupsInCol_);
189	>	cgPlanIntRow->gather(cgLocalToGlobal, cgRowToGlobal);
190	>	cgPlanIntColumn->gather(cgLocalToGlobal, cgColToGlobal);
191
192	+	massFactorsRow.resize(nAtomsInRow_);
193	+	massFactorsCol.resize(nAtomsInCol_);
194	+	AtomPlanRealRow->gather(massFactors, massFactorsRow);
195	+	AtomPlanRealColumn->gather(massFactors, massFactorsCol);
196
197	+	groupListRow_.clear();
198	+	groupListRow_.resize(nGroupsInRow_);
199	+	for (int i = 0; i < nGroupsInRow_; i++) {
200	+	int gid = cgRowToGlobal[i];
201	+	for (int j = 0; j < nAtomsInRow_; j++) {
202	+	int aid = AtomRowToGlobal[j];
203	+	if (globalGroupMembership[aid] == gid)
204	+	groupListRow_[i].push_back(j);
205	+	}
206	+	}
207
208	<	ForceDecomposition::scatter(sbuffer, rbuffer){
209	<	communicators(myIndex_).Reduce_scatter(sbuffer, recevbuf. recvcounts, MPI::DOUBLE, MPI::SUM);
210	<	}
208	>	groupListCol_.clear();
209	>	groupListCol_.resize(nGroupsInCol_);
210	>	for (int i = 0; i < nGroupsInCol_; i++) {
211	>	int gid = cgColToGlobal[i];
212	>	for (int j = 0; j < nAtomsInCol_; j++) {
213	>	int aid = AtomColToGlobal[j];
214	>	if (globalGroupMembership[aid] == gid)
215	>	groupListCol_[i].push_back(j);
216	>	}
217	>	}
218
219	+	excludesForAtom.clear();
220	+	excludesForAtom.resize(nAtomsInRow_);
221	+	toposForAtom.clear();
222	+	toposForAtom.resize(nAtomsInRow_);
223	+	topoDist.clear();
224	+	topoDist.resize(nAtomsInRow_);
225	+	for (int i = 0; i < nAtomsInRow_; i++) {
226	+	int iglob = AtomRowToGlobal[i];
227	+
228	+	for (int j = 0; j < nAtomsInCol_; j++) {
229	+	int jglob = AtomColToGlobal[j];
230	+
231	+	if (excludes->hasPair(iglob, jglob))
232	+	excludesForAtom[i].push_back(j);
233	+
234	+	if (oneTwo->hasPair(iglob, jglob)) {
235	+	toposForAtom[i].push_back(j);
236	+	topoDist[i].push_back(1);
237	+	} else {
238	+	if (oneThree->hasPair(iglob, jglob)) {
239	+	toposForAtom[i].push_back(j);
240	+	topoDist[i].push_back(2);
241	+	} else {
242	+	if (oneFour->hasPair(iglob, jglob)) {
243	+	toposForAtom[i].push_back(j);
244	+	topoDist[i].push_back(3);
245	+	}
246	+	}
247	+	}
248	+	}
249	+	}
250	+
251	+	#else
252	+	excludesForAtom.clear();
253	+	excludesForAtom.resize(nLocal_);
254	+	toposForAtom.clear();
255	+	toposForAtom.resize(nLocal_);
256	+	topoDist.clear();
257	+	topoDist.resize(nLocal_);
258	+
259	+	for (int i = 0; i < nLocal_; i++) {
260	+	int iglob = AtomLocalToGlobal[i];
261	+
262	+	for (int j = 0; j < nLocal_; j++) {
263	+	int jglob = AtomLocalToGlobal[j];
264	+
265	+	if (excludes->hasPair(iglob, jglob))
266	+	excludesForAtom[i].push_back(j);
267	+
268	+	if (oneTwo->hasPair(iglob, jglob)) {
269	+	toposForAtom[i].push_back(j);
270	+	topoDist[i].push_back(1);
271	+	} else {
272	+	if (oneThree->hasPair(iglob, jglob)) {
273	+	toposForAtom[i].push_back(j);
274	+	topoDist[i].push_back(2);
275	+	} else {
276	+	if (oneFour->hasPair(iglob, jglob)) {
277	+	toposForAtom[i].push_back(j);
278	+	topoDist[i].push_back(3);
279	+	}
280	+	}
281	+	}
282	+	}
283	+	}
284	+	#endif
285	+
286	+	// allocate memory for the parallel objects
287	+	atypesLocal.resize(nLocal_);
288	+
289	+	for (int i = 0; i < nLocal_; i++)
290	+	atypesLocal[i] = ff_->getAtomType(idents[i]);
291	+
292	+	groupList_.clear();
293	+	groupList_.resize(nGroups_);
294	+	for (int i = 0; i < nGroups_; i++) {
295	+	int gid = cgLocalToGlobal[i];
296	+	for (int j = 0; j < nLocal_; j++) {
297	+	int aid = AtomLocalToGlobal[j];
298	+	if (globalGroupMembership[aid] == gid) {
299	+	groupList_[i].push_back(j);
300	+	}
301	+	}
302	+	}
303	+
304	+
305	+	createGtypeCutoffMap();
306	+
307	+	}
308	+
309	+	void ForceMatrixDecomposition::createGtypeCutoffMap() {
310	+
311	+	GrCut.clear();
312	+	GrCutSq.clear();
313	+	GrlistSq.clear();
314	+
315	+	RealType tol = 1e-6;
316	+	largestRcut_ = 0.0;
317	+	int atid;
318	+	set<AtomType*> atypes = info_->getSimulatedAtomTypes();
319	+
320	+	map<int, RealType> atypeCutoff;
321	+
322	+	for (set<AtomType*>::iterator at = atypes.begin();
323	+	at != atypes.end(); ++at){
324	+	atid = (*at)->getIdent();
325	+	if (userChoseCutoff_)
326	+	atypeCutoff[atid] = userCutoff_;
327	+	else
328	+	atypeCutoff[atid] = interactionMan_->getSuggestedCutoffRadius(*at);
329	+	}
330	+
331	+	vector<RealType> gTypeCutoffs;
332	+	// first we do a single loop over the cutoff groups to find the
333	+	// largest cutoff for any atypes present in this group.
334	+	#ifdef IS_MPI
335	+	vector<RealType> groupCutoffRow(nGroupsInRow_, 0.0);
336	+	groupRowToGtype.resize(nGroupsInRow_);
337	+	for (int cg1 = 0; cg1 < nGroupsInRow_; cg1++) {
338	+	vector<int> atomListRow = getAtomsInGroupRow(cg1);
339	+	for (vector<int>::iterator ia = atomListRow.begin();
340	+	ia != atomListRow.end(); ++ia) {
341	+	int atom1 = (*ia);
342	+	atid = identsRow[atom1];
343	+	if (atypeCutoff[atid] > groupCutoffRow[cg1]) {
344	+	groupCutoffRow[cg1] = atypeCutoff[atid];
345	+	}
346	+	}
347	+
348	+	bool gTypeFound = false;
349	+	for (int gt = 0; gt < gTypeCutoffs.size(); gt++) {
350	+	if (abs(groupCutoffRow[cg1] - gTypeCutoffs[gt]) < tol) {
351	+	groupRowToGtype[cg1] = gt;
352	+	gTypeFound = true;
353	+	}
354	+	}
355	+	if (!gTypeFound) {
356	+	gTypeCutoffs.push_back( groupCutoffRow[cg1] );
357	+	groupRowToGtype[cg1] = gTypeCutoffs.size() - 1;
358	+	}
359	+
360	+	}
361	+	vector<RealType> groupCutoffCol(nGroupsInCol_, 0.0);
362	+	groupColToGtype.resize(nGroupsInCol_);
363	+	for (int cg2 = 0; cg2 < nGroupsInCol_; cg2++) {
364	+	vector<int> atomListCol = getAtomsInGroupColumn(cg2);
365	+	for (vector<int>::iterator jb = atomListCol.begin();
366	+	jb != atomListCol.end(); ++jb) {
367	+	int atom2 = (*jb);
368	+	atid = identsCol[atom2];
369	+	if (atypeCutoff[atid] > groupCutoffCol[cg2]) {
370	+	groupCutoffCol[cg2] = atypeCutoff[atid];
371	+	}
372	+	}
373	+	bool gTypeFound = false;
374	+	for (int gt = 0; gt < gTypeCutoffs.size(); gt++) {
375	+	if (abs(groupCutoffCol[cg2] - gTypeCutoffs[gt]) < tol) {
376	+	groupColToGtype[cg2] = gt;
377	+	gTypeFound = true;
378	+	}
379	+	}
380	+	if (!gTypeFound) {
381	+	gTypeCutoffs.push_back( groupCutoffCol[cg2] );
382	+	groupColToGtype[cg2] = gTypeCutoffs.size() - 1;
383	+	}
384	+	}
385	+	#else
386	+
387	+	vector<RealType> groupCutoff(nGroups_, 0.0);
388	+	groupToGtype.resize(nGroups_);
389	+	for (int cg1 = 0; cg1 < nGroups_; cg1++) {
390	+	groupCutoff[cg1] = 0.0;
391	+	vector<int> atomList = getAtomsInGroupRow(cg1);
392	+	for (vector<int>::iterator ia = atomList.begin();
393	+	ia != atomList.end(); ++ia) {
394	+	int atom1 = (*ia);
395	+	atid = idents[atom1];
396	+	if (atypeCutoff[atid] > groupCutoff[cg1])
397	+	groupCutoff[cg1] = atypeCutoff[atid];
398	+	}
399	+
400	+	bool gTypeFound = false;
401	+	for (unsigned int gt = 0; gt < gTypeCutoffs.size(); gt++) {
402	+	if (abs(groupCutoff[cg1] - gTypeCutoffs[gt]) < tol) {
403	+	groupToGtype[cg1] = gt;
404	+	gTypeFound = true;
405	+	}
406	+	}
407	+	if (!gTypeFound) {
408	+	gTypeCutoffs.push_back( groupCutoff[cg1] );
409	+	groupToGtype[cg1] = gTypeCutoffs.size() - 1;
410	+	}
411	+	}
412	+	#endif
413
414	+	// Now we find the maximum group cutoff value present in the simulation
415	+
416	+	RealType groupMax = *max_element(gTypeCutoffs.begin(),
417	+	gTypeCutoffs.end());
418	+
419	+	#ifdef IS_MPI
420	+	MPI::COMM_WORLD.Allreduce(&groupMax, &groupMax, 1, MPI::REALTYPE,
421	+	MPI::MAX);
422	+	#endif
423	+
424	+	RealType tradRcut = groupMax;
425	+
426	+	GrCut.resize( gTypeCutoffs.size() );
427	+	GrCutSq.resize( gTypeCutoffs.size() );
428	+	GrlistSq.resize( gTypeCutoffs.size() );
429	+
430	+
431	+	for (unsigned int i = 0; i < gTypeCutoffs.size();  i++) {
432	+	GrCut[i].resize( gTypeCutoffs.size() , 0.0);
433	+	GrCutSq[i].resize( gTypeCutoffs.size(), 0.0 );
434	+	GrlistSq[i].resize( gTypeCutoffs.size(), 0.0 );
435	+
436	+	for (unsigned int j = 0; j < gTypeCutoffs.size();  j++) {
437	+	RealType thisRcut;
438	+	switch(cutoffPolicy_) {
439	+	case TRADITIONAL:
440	+	thisRcut = tradRcut;
441	+	break;
442	+	case MIX:
443	+	thisRcut = 0.5 * (gTypeCutoffs[i] + gTypeCutoffs[j]);
444	+	break;
445	+	case MAX:
446	+	thisRcut = max(gTypeCutoffs[i], gTypeCutoffs[j]);
447	+	break;
448	+	default:
449	+	sprintf(painCave.errMsg,
450	+	"ForceMatrixDecomposition::createGtypeCutoffMap "
451	+	"hit an unknown cutoff policy!\n");
452	+	painCave.severity = OPENMD_ERROR;
453	+	painCave.isFatal = 1;
454	+	simError();
455	+	break;
456	+	}
457	+
458	+	GrCut[i][j] = thisRcut;
459	+	if (thisRcut > largestRcut_) largestRcut_ = thisRcut;
460	+	GrCutSq[i][j] = thisRcut * thisRcut;
461	+	GrlistSq[i][j] = pow(thisRcut + skinThickness_, 2);
462	+
463	+	// pair<int,int> key = make_pair(i,j);
464	+	// gTypeCutoffMap[key].first = thisRcut;
465	+	// gTypeCutoffMap[key].third = pow(thisRcut + skinThickness_, 2);
466	+	// sanity check
467	+
468	+	if (userChoseCutoff_) {
469	+	if (abs(GrCut[i][j] - userCutoff_) > 0.0001) {
470	+	sprintf(painCave.errMsg,
471	+	"ForceMatrixDecomposition::createGtypeCutoffMap "
472	+	"user-specified rCut (%lf) does not match computed group Cutoff\n", userCutoff_);
473	+	painCave.severity = OPENMD_ERROR;
474	+	painCave.isFatal = 1;
475	+	simError();
476	+	}
477	+	}
478	+	}
479	+	}
480	+	}
481	+
482	+	void ForceMatrixDecomposition::getGroupCutoffs(int &cg1, int &cg2, RealType &rcut, RealType &rcutsq, RealType &rlistsq) {
483	+	int i, j;
484	+	#ifdef IS_MPI
485	+	i = groupRowToGtype[cg1];
486	+	j = groupColToGtype[cg2];
487	+	#else
488	+	i = groupToGtype[cg1];
489	+	j = groupToGtype[cg2];
490	+	#endif
491	+	rcut = GrCut[i][j];
492	+	rcutsq = GrCutSq[i][j];
493	+	rlistsq = GrlistSq[i][j];
494	+	return;
495	+	//return gTypeCutoffMap[make_pair(i,j)];
496	+	}
497	+
498	+	int ForceMatrixDecomposition::getTopologicalDistance(int atom1, int atom2) {
499	+	for (unsigned int j = 0; j < toposForAtom[atom1].size(); j++) {
500	+	if (toposForAtom[atom1][j] == atom2)
501	+	return topoDist[atom1][j];
502	+	}
503	+	return 0;
504	+	}
505	+
506	+	void ForceMatrixDecomposition::zeroWorkArrays() {
507	+	pairwisePot = 0.0;
508	+	embeddingPot = 0.0;
509	+	excludedPot = 0.0;
510	+	excludedSelfPot = 0.0;
511	+
512	+	#ifdef IS_MPI
513	+	if (storageLayout_ & DataStorage::dslForce) {
514	+	fill(atomRowData.force.begin(), atomRowData.force.end(), V3Zero);
515	+	fill(atomColData.force.begin(), atomColData.force.end(), V3Zero);
516	+	}
517	+
518	+	if (storageLayout_ & DataStorage::dslTorque) {
519	+	fill(atomRowData.torque.begin(), atomRowData.torque.end(), V3Zero);
520	+	fill(atomColData.torque.begin(), atomColData.torque.end(), V3Zero);
521	+	}
522	+
523	+	fill(pot_row.begin(), pot_row.end(),
524	+	Vector<RealType, N_INTERACTION_FAMILIES> (0.0));
525	+
526	+	fill(pot_col.begin(), pot_col.end(),
527	+	Vector<RealType, N_INTERACTION_FAMILIES> (0.0));
528	+
529	+	fill(expot_row.begin(), expot_row.end(),
530	+	Vector<RealType, N_INTERACTION_FAMILIES> (0.0));
531	+
532	+	fill(expot_col.begin(), expot_col.end(),
533	+	Vector<RealType, N_INTERACTION_FAMILIES> (0.0));
534	+
535	+	if (storageLayout_ & DataStorage::dslParticlePot) {
536	+	fill(atomRowData.particlePot.begin(), atomRowData.particlePot.end(),
537	+	0.0);
538	+	fill(atomColData.particlePot.begin(), atomColData.particlePot.end(),
539	+	0.0);
540	+	}
541	+
542	+	if (storageLayout_ & DataStorage::dslDensity) {
543	+	fill(atomRowData.density.begin(), atomRowData.density.end(), 0.0);
544	+	fill(atomColData.density.begin(), atomColData.density.end(), 0.0);
545	+	}
546	+
547	+	if (storageLayout_ & DataStorage::dslFunctional) {
548	+	fill(atomRowData.functional.begin(), atomRowData.functional.end(),
549	+	0.0);
550	+	fill(atomColData.functional.begin(), atomColData.functional.end(),
551	+	0.0);
552	+	}
553	+
554	+	if (storageLayout_ & DataStorage::dslFunctionalDerivative) {
555	+	fill(atomRowData.functionalDerivative.begin(),
556	+	atomRowData.functionalDerivative.end(), 0.0);
557	+	fill(atomColData.functionalDerivative.begin(),
558	+	atomColData.functionalDerivative.end(), 0.0);
559	+	}
560	+
561	+	if (storageLayout_ & DataStorage::dslSkippedCharge) {
562	+	fill(atomRowData.skippedCharge.begin(),
563	+	atomRowData.skippedCharge.end(), 0.0);
564	+	fill(atomColData.skippedCharge.begin(),
565	+	atomColData.skippedCharge.end(), 0.0);
566	+	}
567	+
568	+	if (storageLayout_ & DataStorage::dslFlucQForce) {
569	+	fill(atomRowData.flucQFrc.begin(),
570	+	atomRowData.flucQFrc.end(), 0.0);
571	+	fill(atomColData.flucQFrc.begin(),
572	+	atomColData.flucQFrc.end(), 0.0);
573	+	}
574	+
575	+	if (storageLayout_ & DataStorage::dslElectricField) {
576	+	fill(atomRowData.electricField.begin(),
577	+	atomRowData.electricField.end(), V3Zero);
578	+	fill(atomColData.electricField.begin(),
579	+	atomColData.electricField.end(), V3Zero);
580	+	}
581	+
582	+	#endif
583	+	// even in parallel, we need to zero out the local arrays:
584	+
585	+	if (storageLayout_ & DataStorage::dslParticlePot) {
586	+	fill(snap_->atomData.particlePot.begin(),
587	+	snap_->atomData.particlePot.end(), 0.0);
588	+	}
589	+
590	+	if (storageLayout_ & DataStorage::dslDensity) {
591	+	fill(snap_->atomData.density.begin(),
592	+	snap_->atomData.density.end(), 0.0);
593	+	}
594	+
595	+	if (storageLayout_ & DataStorage::dslFunctional) {
596	+	fill(snap_->atomData.functional.begin(),
597	+	snap_->atomData.functional.end(), 0.0);
598	+	}
599	+
600	+	if (storageLayout_ & DataStorage::dslFunctionalDerivative) {
601	+	fill(snap_->atomData.functionalDerivative.begin(),
602	+	snap_->atomData.functionalDerivative.end(), 0.0);
603	+	}
604	+
605	+	if (storageLayout_ & DataStorage::dslSkippedCharge) {
606	+	fill(snap_->atomData.skippedCharge.begin(),
607	+	snap_->atomData.skippedCharge.end(), 0.0);
608	+	}
609	+
610	+	if (storageLayout_ & DataStorage::dslElectricField) {
611	+	fill(snap_->atomData.electricField.begin(),
612	+	snap_->atomData.electricField.end(), V3Zero);
613	+	}
614	+	}
615	+
616	+
617	+	void ForceMatrixDecomposition::distributeData()  {
618	+	snap_ = sman_->getCurrentSnapshot();
619	+	storageLayout_ = sman_->getStorageLayout();
620	+	#ifdef IS_MPI
621	+
622	+	// gather up the atomic positions
623	+	AtomPlanVectorRow->gather(snap_->atomData.position,
624	+	atomRowData.position);
625	+	AtomPlanVectorColumn->gather(snap_->atomData.position,
626	+	atomColData.position);
627	+
628	+	// gather up the cutoff group positions
629	+
630	+	cgPlanVectorRow->gather(snap_->cgData.position,
631	+	cgRowData.position);
632	+
633	+	cgPlanVectorColumn->gather(snap_->cgData.position,
634	+	cgColData.position);
635	+
636	+
637	+
638	+	if (needVelocities_) {
639	+	// gather up the atomic velocities
640	+	AtomPlanVectorColumn->gather(snap_->atomData.velocity,
641	+	atomColData.velocity);
642	+
643	+	cgPlanVectorColumn->gather(snap_->cgData.velocity,
644	+	cgColData.velocity);
645	+	}
646	+
647	+
648	+	// if needed, gather the atomic rotation matrices
649	+	if (storageLayout_ & DataStorage::dslAmat) {
650	+	AtomPlanMatrixRow->gather(snap_->atomData.aMat,
651	+	atomRowData.aMat);
652	+	AtomPlanMatrixColumn->gather(snap_->atomData.aMat,
653	+	atomColData.aMat);
654	+	}
655	+
656	+	// if needed, gather the atomic eletrostatic information
657	+	if (storageLayout_ & DataStorage::dslDipole) {
658	+	AtomPlanVectorRow->gather(snap_->atomData.dipole,
659	+	atomRowData.dipole);
660	+	AtomPlanVectorColumn->gather(snap_->atomData.dipole,
661	+	atomColData.dipole);
662	+	}
663	+
664	+	if (storageLayout_ & DataStorage::dslQuadrupole) {
665	+	AtomPlanMatrixRow->gather(snap_->atomData.quadrupole,
666	+	atomRowData.quadrupole);
667	+	AtomPlanMatrixColumn->gather(snap_->atomData.quadrupole,
668	+	atomColData.quadrupole);
669	+	}
670	+
671	+	// if needed, gather the atomic fluctuating charge values
672	+	if (storageLayout_ & DataStorage::dslFlucQPosition) {
673	+	AtomPlanRealRow->gather(snap_->atomData.flucQPos,
674	+	atomRowData.flucQPos);
675	+	AtomPlanRealColumn->gather(snap_->atomData.flucQPos,
676	+	atomColData.flucQPos);
677	+	}
678	+
679	+	#endif
680	+	}
681	+
682	+	/* collects information obtained during the pre-pair loop onto local
683	+	* data structures.
684	+	*/
685	+	void ForceMatrixDecomposition::collectIntermediateData() {
686	+	snap_ = sman_->getCurrentSnapshot();
687	+	storageLayout_ = sman_->getStorageLayout();
688	+	#ifdef IS_MPI
689	+
690	+	if (storageLayout_ & DataStorage::dslDensity) {
691	+
692	+	AtomPlanRealRow->scatter(atomRowData.density,
693	+	snap_->atomData.density);
694	+
695	+	int n = snap_->atomData.density.size();
696	+	vector<RealType> rho_tmp(n, 0.0);
697	+	AtomPlanRealColumn->scatter(atomColData.density, rho_tmp);
698	+	for (int i = 0; i < n; i++)
699	+	snap_->atomData.density[i] += rho_tmp[i];
700	+	}
701	+
702	+	// this isn't necessary if we don't have polarizable atoms, but
703	+	// we'll leave it here for now.
704	+	if (storageLayout_ & DataStorage::dslElectricField) {
705	+
706	+	AtomPlanVectorRow->scatter(atomRowData.electricField,
707	+	snap_->atomData.electricField);
708	+
709	+	int n = snap_->atomData.electricField.size();
710	+	vector<Vector3d> field_tmp(n, V3Zero);
711	+	AtomPlanVectorColumn->scatter(atomColData.electricField,
712	+	field_tmp);
713	+	for (int i = 0; i < n; i++)
714	+	snap_->atomData.electricField[i] += field_tmp[i];
715	+	}
716	+	#endif
717	+	}
718	+
719	+	/*
720	+	* redistributes information obtained during the pre-pair loop out to
721	+	* row and column-indexed data structures
722	+	*/
723	+	void ForceMatrixDecomposition::distributeIntermediateData() {
724	+	snap_ = sman_->getCurrentSnapshot();
725	+	storageLayout_ = sman_->getStorageLayout();
726	+	#ifdef IS_MPI
727	+	if (storageLayout_ & DataStorage::dslFunctional) {
728	+	AtomPlanRealRow->gather(snap_->atomData.functional,
729	+	atomRowData.functional);
730	+	AtomPlanRealColumn->gather(snap_->atomData.functional,
731	+	atomColData.functional);
732	+	}
733	+
734	+	if (storageLayout_ & DataStorage::dslFunctionalDerivative) {
735	+	AtomPlanRealRow->gather(snap_->atomData.functionalDerivative,
736	+	atomRowData.functionalDerivative);
737	+	AtomPlanRealColumn->gather(snap_->atomData.functionalDerivative,
738	+	atomColData.functionalDerivative);
739	+	}
740	+	#endif
741	+	}
742	+
743	+
744	+	void ForceMatrixDecomposition::collectData() {
745	+	snap_ = sman_->getCurrentSnapshot();
746	+	storageLayout_ = sman_->getStorageLayout();
747	+	#ifdef IS_MPI
748	+	int n = snap_->atomData.force.size();
749	+	vector<Vector3d> frc_tmp(n, V3Zero);
750	+
751	+	AtomPlanVectorRow->scatter(atomRowData.force, frc_tmp);
752	+	for (int i = 0; i < n; i++) {
753	+	snap_->atomData.force[i] += frc_tmp[i];
754	+	frc_tmp[i] = 0.0;
755	+	}
756	+
757	+	AtomPlanVectorColumn->scatter(atomColData.force, frc_tmp);
758	+	for (int i = 0; i < n; i++) {
759	+	snap_->atomData.force[i] += frc_tmp[i];
760	+	}
761	+
762	+	if (storageLayout_ & DataStorage::dslTorque) {
763	+
764	+	int nt = snap_->atomData.torque.size();
765	+	vector<Vector3d> trq_tmp(nt, V3Zero);
766	+
767	+	AtomPlanVectorRow->scatter(atomRowData.torque, trq_tmp);
768	+	for (int i = 0; i < nt; i++) {
769	+	snap_->atomData.torque[i] += trq_tmp[i];
770	+	trq_tmp[i] = 0.0;
771	+	}
772	+
773	+	AtomPlanVectorColumn->scatter(atomColData.torque, trq_tmp);
774	+	for (int i = 0; i < nt; i++)
775	+	snap_->atomData.torque[i] += trq_tmp[i];
776	+	}
777	+
778	+	if (storageLayout_ & DataStorage::dslSkippedCharge) {
779	+
780	+	int ns = snap_->atomData.skippedCharge.size();
781	+	vector<RealType> skch_tmp(ns, 0.0);
782	+
783	+	AtomPlanRealRow->scatter(atomRowData.skippedCharge, skch_tmp);
784	+	for (int i = 0; i < ns; i++) {
785	+	snap_->atomData.skippedCharge[i] += skch_tmp[i];
786	+	skch_tmp[i] = 0.0;
787	+	}
788	+
789	+	AtomPlanRealColumn->scatter(atomColData.skippedCharge, skch_tmp);
790	+	for (int i = 0; i < ns; i++)
791	+	snap_->atomData.skippedCharge[i] += skch_tmp[i];
792	+
793	+	}
794	+
795	+	if (storageLayout_ & DataStorage::dslFlucQForce) {
796	+
797	+	int nq = snap_->atomData.flucQFrc.size();
798	+	vector<RealType> fqfrc_tmp(nq, 0.0);
799	+
800	+	AtomPlanRealRow->scatter(atomRowData.flucQFrc, fqfrc_tmp);
801	+	for (int i = 0; i < nq; i++) {
802	+	snap_->atomData.flucQFrc[i] += fqfrc_tmp[i];
803	+	fqfrc_tmp[i] = 0.0;
804	+	}
805	+
806	+	AtomPlanRealColumn->scatter(atomColData.flucQFrc, fqfrc_tmp);
807	+	for (int i = 0; i < nq; i++)
808	+	snap_->atomData.flucQFrc[i] += fqfrc_tmp[i];
809	+
810	+	}
811	+
812	+	if (storageLayout_ & DataStorage::dslElectricField) {
813	+
814	+	int nef = snap_->atomData.electricField.size();
815	+	vector<Vector3d> efield_tmp(nef, V3Zero);
816	+
817	+	AtomPlanVectorRow->scatter(atomRowData.electricField, efield_tmp);
818	+	for (int i = 0; i < nef; i++) {
819	+	snap_->atomData.electricField[i] += efield_tmp[i];
820	+	efield_tmp[i] = 0.0;
821	+	}
822	+
823	+	AtomPlanVectorColumn->scatter(atomColData.electricField, efield_tmp);
824	+	for (int i = 0; i < nef; i++)
825	+	snap_->atomData.electricField[i] += efield_tmp[i];
826	+	}
827	+
828	+
829	+	nLocal_ = snap_->getNumberOfAtoms();
830	+
831	+	vector<potVec> pot_temp(nLocal_,
832	+	Vector<RealType, N_INTERACTION_FAMILIES> (0.0));
833	+	vector<potVec> expot_temp(nLocal_,
834	+	Vector<RealType, N_INTERACTION_FAMILIES> (0.0));
835	+
836	+	// scatter/gather pot_row into the members of my column
837	+
838	+	AtomPlanPotRow->scatter(pot_row, pot_temp);
839	+	AtomPlanPotRow->scatter(expot_row, expot_temp);
840	+
841	+	for (int ii = 0;  ii < pot_temp.size(); ii++ )
842	+	pairwisePot += pot_temp[ii];
843	+
844	+	for (int ii = 0;  ii < expot_temp.size(); ii++ )
845	+	excludedPot += expot_temp[ii];
846	+
847	+	if (storageLayout_ & DataStorage::dslParticlePot) {
848	+	// This is the pairwise contribution to the particle pot.  The
849	+	// embedding contribution is added in each of the low level
850	+	// non-bonded routines.  In single processor, this is done in
851	+	// unpackInteractionData, not in collectData.
852	+	for (int ii = 0; ii < N_INTERACTION_FAMILIES; ii++) {
853	+	for (int i = 0; i < nLocal_; i++) {
854	+	// factor of two is because the total potential terms are divided
855	+	// by 2 in parallel due to row/ column scatter
856	+	snap_->atomData.particlePot[i] += 2.0 * pot_temp[i](ii);
857	+	}
858	+	}
859	+	}
860	+
861	+	fill(pot_temp.begin(), pot_temp.end(),
862	+	Vector<RealType, N_INTERACTION_FAMILIES> (0.0));
863	+	fill(expot_temp.begin(), expot_temp.end(),
864	+	Vector<RealType, N_INTERACTION_FAMILIES> (0.0));
865	+
866	+	AtomPlanPotColumn->scatter(pot_col, pot_temp);
867	+	AtomPlanPotColumn->scatter(expot_col, expot_temp);
868	+
869	+	for (int ii = 0;  ii < pot_temp.size(); ii++ )
870	+	pairwisePot += pot_temp[ii];
871	+
872	+	for (int ii = 0;  ii < expot_temp.size(); ii++ )
873	+	excludedPot += expot_temp[ii];
874	+
875	+	if (storageLayout_ & DataStorage::dslParticlePot) {
876	+	// This is the pairwise contribution to the particle pot.  The
877	+	// embedding contribution is added in each of the low level
878	+	// non-bonded routines.  In single processor, this is done in
879	+	// unpackInteractionData, not in collectData.
880	+	for (int ii = 0; ii < N_INTERACTION_FAMILIES; ii++) {
881	+	for (int i = 0; i < nLocal_; i++) {
882	+	// factor of two is because the total potential terms are divided
883	+	// by 2 in parallel due to row/ column scatter
884	+	snap_->atomData.particlePot[i] += 2.0 * pot_temp[i](ii);
885	+	}
886	+	}
887	+	}
888	+
889	+	if (storageLayout_ & DataStorage::dslParticlePot) {
890	+	int npp = snap_->atomData.particlePot.size();
891	+	vector<RealType> ppot_temp(npp, 0.0);
892	+
893	+	// This is the direct or embedding contribution to the particle
894	+	// pot.
895	+
896	+	AtomPlanRealRow->scatter(atomRowData.particlePot, ppot_temp);
897	+	for (int i = 0; i < npp; i++) {
898	+	snap_->atomData.particlePot[i] += ppot_temp[i];
899	+	}
900	+
901	+	fill(ppot_temp.begin(), ppot_temp.end(), 0.0);
902	+
903	+	AtomPlanRealColumn->scatter(atomColData.particlePot, ppot_temp);
904	+	for (int i = 0; i < npp; i++) {
905	+	snap_->atomData.particlePot[i] += ppot_temp[i];
906	+	}
907	+	}
908	+
909	+	for (int ii = 0; ii < N_INTERACTION_FAMILIES; ii++) {
910	+	RealType ploc1 = pairwisePot[ii];
911	+	RealType ploc2 = 0.0;
912	+	MPI::COMM_WORLD.Allreduce(&ploc1, &ploc2, 1, MPI::REALTYPE, MPI::SUM);
913	+	pairwisePot[ii] = ploc2;
914	+	}
915	+
916	+	for (int ii = 0; ii < N_INTERACTION_FAMILIES; ii++) {
917	+	RealType ploc1 = excludedPot[ii];
918	+	RealType ploc2 = 0.0;
919	+	MPI::COMM_WORLD.Allreduce(&ploc1, &ploc2, 1, MPI::REALTYPE, MPI::SUM);
920	+	excludedPot[ii] = ploc2;
921	+	}
922	+
923	+	// Here be dragons.
924	+	MPI::Intracomm col = colComm.getComm();
925	+
926	+	col.Allreduce(MPI::IN_PLACE,
927	+	&snap_->frameData.conductiveHeatFlux[0], 3,
928	+	MPI::REALTYPE, MPI::SUM);
929	+
930	+
931	+	#endif
932	+
933	+	}
934	+
935	+	/**
936	+	* Collects information obtained during the post-pair (and embedding
937	+	* functional) loops onto local data structures.
938	+	*/
939	+	void ForceMatrixDecomposition::collectSelfData() {
940	+	snap_ = sman_->getCurrentSnapshot();
941	+	storageLayout_ = sman_->getStorageLayout();
942	+
943	+	#ifdef IS_MPI
944	+	for (int ii = 0; ii < N_INTERACTION_FAMILIES; ii++) {
945	+	RealType ploc1 = embeddingPot[ii];
946	+	RealType ploc2 = 0.0;
947	+	MPI::COMM_WORLD.Allreduce(&ploc1, &ploc2, 1, MPI::REALTYPE, MPI::SUM);
948	+	embeddingPot[ii] = ploc2;
949	+	}
950	+	for (int ii = 0; ii < N_INTERACTION_FAMILIES; ii++) {
951	+	RealType ploc1 = excludedSelfPot[ii];
952	+	RealType ploc2 = 0.0;
953	+	MPI::COMM_WORLD.Allreduce(&ploc1, &ploc2, 1, MPI::REALTYPE, MPI::SUM);
954	+	excludedSelfPot[ii] = ploc2;
955	+	}
956	+	#endif
957	+
958	+	}
959	+
960	+
961	+
962	+	int& ForceMatrixDecomposition::getNAtomsInRow() {
963	+	#ifdef IS_MPI
964	+	return nAtomsInRow_;
965	+	#else
966	+	return nLocal_;
967	+	#endif
968	+	}
969	+
970	+	/**
971	+	* returns the list of atoms belonging to this group.
972	+	*/
973	+	vector<int>& ForceMatrixDecomposition::getAtomsInGroupRow(int cg1){
974	+	#ifdef IS_MPI
975	+	return groupListRow_[cg1];
976	+	#else
977	+	return groupList_[cg1];
978	+	#endif
979	+	}
980	+
981	+	vector<int>& ForceMatrixDecomposition::getAtomsInGroupColumn(int cg2){
982	+	#ifdef IS_MPI
983	+	return groupListCol_[cg2];
984	+	#else
985	+	return groupList_[cg2];
986	+	#endif
987	+	}
988	+
989	+	Vector3d ForceMatrixDecomposition::getIntergroupVector(int cg1, int cg2){
990	+	Vector3d d;
991	+
992	+	#ifdef IS_MPI
993	+	d = cgColData.position[cg2] - cgRowData.position[cg1];
994	+	#else
995	+	d = snap_->cgData.position[cg2] - snap_->cgData.position[cg1];
996	+	#endif
997	+
998	+	if (usePeriodicBoundaryConditions_) {
999	+	snap_->wrapVector(d);
1000	+	}
1001	+	return d;
1002	+	}
1003	+
1004	+	Vector3d& ForceMatrixDecomposition::getGroupVelocityColumn(int cg2){
1005	+	#ifdef IS_MPI
1006	+	return cgColData.velocity[cg2];
1007	+	#else
1008	+	return snap_->cgData.velocity[cg2];
1009	+	#endif
1010	+	}
1011	+
1012	+	Vector3d& ForceMatrixDecomposition::getAtomVelocityColumn(int atom2){
1013	+	#ifdef IS_MPI
1014	+	return atomColData.velocity[atom2];
1015	+	#else
1016	+	return snap_->atomData.velocity[atom2];
1017	+	#endif
1018	+	}
1019	+
1020	+
1021	+	Vector3d ForceMatrixDecomposition::getAtomToGroupVectorRow(int atom1, int cg1){
1022	+
1023	+	Vector3d d;
1024	+
1025	+	#ifdef IS_MPI
1026	+	d = cgRowData.position[cg1] - atomRowData.position[atom1];
1027	+	#else
1028	+	d = snap_->cgData.position[cg1] - snap_->atomData.position[atom1];
1029	+	#endif
1030	+	if (usePeriodicBoundaryConditions_) {
1031	+	snap_->wrapVector(d);
1032	+	}
1033	+	return d;
1034	+	}
1035	+
1036	+	Vector3d ForceMatrixDecomposition::getAtomToGroupVectorColumn(int atom2, int cg2){
1037	+	Vector3d d;
1038	+
1039	+	#ifdef IS_MPI
1040	+	d = cgColData.position[cg2] - atomColData.position[atom2];
1041	+	#else
1042	+	d = snap_->cgData.position[cg2] - snap_->atomData.position[atom2];
1043	+	#endif
1044	+	if (usePeriodicBoundaryConditions_) {
1045	+	snap_->wrapVector(d);
1046	+	}
1047	+	return d;
1048	+	}
1049	+
1050	+	RealType& ForceMatrixDecomposition::getMassFactorRow(int atom1) {
1051	+	#ifdef IS_MPI
1052	+	return massFactorsRow[atom1];
1053	+	#else
1054	+	return massFactors[atom1];
1055	+	#endif
1056	+	}
1057	+
1058	+	RealType& ForceMatrixDecomposition::getMassFactorColumn(int atom2) {
1059	+	#ifdef IS_MPI
1060	+	return massFactorsCol[atom2];
1061	+	#else
1062	+	return massFactors[atom2];
1063	+	#endif
1064	+
1065	+	}
1066	+
1067	+	Vector3d ForceMatrixDecomposition::getInteratomicVector(int atom1, int atom2){
1068	+	Vector3d d;
1069	+
1070	+	#ifdef IS_MPI
1071	+	d = atomColData.position[atom2] - atomRowData.position[atom1];
1072	+	#else
1073	+	d = snap_->atomData.position[atom2] - snap_->atomData.position[atom1];
1074	+	#endif
1075	+	if (usePeriodicBoundaryConditions_) {
1076	+	snap_->wrapVector(d);
1077	+	}
1078	+	return d;
1079	+	}
1080	+
1081	+	vector<int>& ForceMatrixDecomposition::getExcludesForAtom(int atom1) {
1082	+	return excludesForAtom[atom1];
1083	+	}
1084	+
1085	+	/**
1086	+	* We need to exclude some overcounted interactions that result from
1087	+	* the parallel decomposition.
1088	+	*/
1089	+	bool ForceMatrixDecomposition::skipAtomPair(int atom1, int atom2, int cg1, int cg2) {
1090	+	int unique_id_1, unique_id_2;
1091	+
1092	+	#ifdef IS_MPI
1093	+	// in MPI, we have to look up the unique IDs for each atom
1094	+	unique_id_1 = AtomRowToGlobal[atom1];
1095	+	unique_id_2 = AtomColToGlobal[atom2];
1096	+	// group1 = cgRowToGlobal[cg1];
1097	+	// group2 = cgColToGlobal[cg2];
1098	+	#else
1099	+	unique_id_1 = AtomLocalToGlobal[atom1];
1100	+	unique_id_2 = AtomLocalToGlobal[atom2];
1101	+	int group1 = cgLocalToGlobal[cg1];
1102	+	int group2 = cgLocalToGlobal[cg2];
1103	+	#endif
1104	+
1105	+	if (unique_id_1 == unique_id_2) return true;
1106	+
1107	+	#ifdef IS_MPI
1108	+	// this prevents us from doing the pair on multiple processors
1109	+	if (unique_id_1 < unique_id_2) {
1110	+	if ((unique_id_1 + unique_id_2) % 2 == 0) return true;
1111	+	} else {
1112	+	if ((unique_id_1 + unique_id_2) % 2 == 1) return true;
1113	+	}
1114	+	#endif
1115	+
1116	+	#ifndef IS_MPI
1117	+	if (group1 == group2) {
1118	+	if (unique_id_1 < unique_id_2) return true;
1119	+	}
1120	+	#endif
1121	+
1122	+	return false;
1123	+	}
1124	+
1125	+	/**
1126	+	* We need to handle the interactions for atoms who are involved in
1127	+	* the same rigid body as well as some short range interactions
1128	+	* (bonds, bends, torsions) differently from other interactions.
1129	+	* We'll still visit the pairwise routines, but with a flag that
1130	+	* tells those routines to exclude the pair from direct long range
1131	+	* interactions.  Some indirect interactions (notably reaction
1132	+	* field) must still be handled for these pairs.
1133	+	*/
1134	+	bool ForceMatrixDecomposition::excludeAtomPair(int atom1, int atom2) {
1135	+
1136	+	// excludesForAtom was constructed to use row/column indices in the MPI
1137	+	// version, and to use local IDs in the non-MPI version:
1138	+
1139	+	for (vector<int>::iterator i = excludesForAtom[atom1].begin();
1140	+	i != excludesForAtom[atom1].end(); ++i) {
1141	+	if ( (*i) == atom2 ) return true;
1142	+	}
1143	+
1144	+	return false;
1145	+	}
1146	+
1147	+
1148	+	void ForceMatrixDecomposition::addForceToAtomRow(int atom1, Vector3d fg){
1149	+	#ifdef IS_MPI
1150	+	atomRowData.force[atom1] += fg;
1151	+	#else
1152	+	snap_->atomData.force[atom1] += fg;
1153	+	#endif
1154	+	}
1155	+
1156	+	void ForceMatrixDecomposition::addForceToAtomColumn(int atom2, Vector3d fg){
1157	+	#ifdef IS_MPI
1158	+	atomColData.force[atom2] += fg;
1159	+	#else
1160	+	snap_->atomData.force[atom2] += fg;
1161	+	#endif
1162	+	}
1163	+
1164	+	// filling interaction blocks with pointers
1165	+	void ForceMatrixDecomposition::fillInteractionData(InteractionData &idat,
1166	+	int atom1, int atom2) {
1167	+
1168	+	idat.excluded = excludeAtomPair(atom1, atom2);
1169	+
1170	+	#ifdef IS_MPI
1171	+	idat.atypes = make_pair( atypesRow[atom1], atypesCol[atom2]);
1172	+	idat.atid1 = identsRow[atom1];
1173	+	idat.atid2 = identsCol[atom2];
1174	+	//idat.atypes = make_pair( ff_->getAtomType(identsRow[atom1]),
1175	+	//                         ff_->getAtomType(identsCol[atom2]) );
1176	+
1177	+	if (storageLayout_ & DataStorage::dslAmat) {
1178	+	idat.A1 = &(atomRowData.aMat[atom1]);
1179	+	idat.A2 = &(atomColData.aMat[atom2]);
1180	+	}
1181	+
1182	+	if (storageLayout_ & DataStorage::dslTorque) {
1183	+	idat.t1 = &(atomRowData.torque[atom1]);
1184	+	idat.t2 = &(atomColData.torque[atom2]);
1185	+	}
1186	+
1187	+	if (storageLayout_ & DataStorage::dslDipole) {
1188	+	idat.dipole1 = &(atomRowData.dipole[atom1]);
1189	+	idat.dipole2 = &(atomColData.dipole[atom2]);
1190	+	}
1191	+
1192	+	if (storageLayout_ & DataStorage::dslQuadrupole) {
1193	+	idat.quadrupole1 = &(atomRowData.quadrupole[atom1]);
1194	+	idat.quadrupole2 = &(atomColData.quadrupole[atom2]);
1195	+	}
1196	+
1197	+	if (storageLayout_ & DataStorage::dslDensity) {
1198	+	idat.rho1 = &(atomRowData.density[atom1]);
1199	+	idat.rho2 = &(atomColData.density[atom2]);
1200	+	}
1201	+
1202	+	if (storageLayout_ & DataStorage::dslFunctional) {
1203	+	idat.frho1 = &(atomRowData.functional[atom1]);
1204	+	idat.frho2 = &(atomColData.functional[atom2]);
1205	+	}
1206	+
1207	+	if (storageLayout_ & DataStorage::dslFunctionalDerivative) {
1208	+	idat.dfrho1 = &(atomRowData.functionalDerivative[atom1]);
1209	+	idat.dfrho2 = &(atomColData.functionalDerivative[atom2]);
1210	+	}
1211	+
1212	+	if (storageLayout_ & DataStorage::dslParticlePot) {
1213	+	idat.particlePot1 = &(atomRowData.particlePot[atom1]);
1214	+	idat.particlePot2 = &(atomColData.particlePot[atom2]);
1215	+	}
1216	+
1217	+	if (storageLayout_ & DataStorage::dslSkippedCharge) {
1218	+	idat.skippedCharge1 = &(atomRowData.skippedCharge[atom1]);
1219	+	idat.skippedCharge2 = &(atomColData.skippedCharge[atom2]);
1220	+	}
1221	+
1222	+	if (storageLayout_ & DataStorage::dslFlucQPosition) {
1223	+	idat.flucQ1 = &(atomRowData.flucQPos[atom1]);
1224	+	idat.flucQ2 = &(atomColData.flucQPos[atom2]);
1225	+	}
1226	+
1227	+	#else
1228	+
1229	+	idat.atypes = make_pair( atypesLocal[atom1], atypesLocal[atom2]);
1230	+	idat.atid1 = idents[atom1];
1231	+	idat.atid2 = idents[atom2];
1232	+
1233	+	if (storageLayout_ & DataStorage::dslAmat) {
1234	+	idat.A1 = &(snap_->atomData.aMat[atom1]);
1235	+	idat.A2 = &(snap_->atomData.aMat[atom2]);
1236	+	}
1237	+
1238	+	if (storageLayout_ & DataStorage::dslTorque) {
1239	+	idat.t1 = &(snap_->atomData.torque[atom1]);
1240	+	idat.t2 = &(snap_->atomData.torque[atom2]);
1241	+	}
1242	+
1243	+	if (storageLayout_ & DataStorage::dslDipole) {
1244	+	idat.dipole1 = &(snap_->atomData.dipole[atom1]);
1245	+	idat.dipole2 = &(snap_->atomData.dipole[atom2]);
1246	+	}
1247	+
1248	+	if (storageLayout_ & DataStorage::dslQuadrupole) {
1249	+	idat.quadrupole1 = &(snap_->atomData.quadrupole[atom1]);
1250	+	idat.quadrupole2 = &(snap_->atomData.quadrupole[atom2]);
1251	+	}
1252	+
1253	+	if (storageLayout_ & DataStorage::dslDensity) {
1254	+	idat.rho1 = &(snap_->atomData.density[atom1]);
1255	+	idat.rho2 = &(snap_->atomData.density[atom2]);
1256	+	}
1257	+
1258	+	if (storageLayout_ & DataStorage::dslFunctional) {
1259	+	idat.frho1 = &(snap_->atomData.functional[atom1]);
1260	+	idat.frho2 = &(snap_->atomData.functional[atom2]);
1261	+	}
1262	+
1263	+	if (storageLayout_ & DataStorage::dslFunctionalDerivative) {
1264	+	idat.dfrho1 = &(snap_->atomData.functionalDerivative[atom1]);
1265	+	idat.dfrho2 = &(snap_->atomData.functionalDerivative[atom2]);
1266	+	}
1267	+
1268	+	if (storageLayout_ & DataStorage::dslParticlePot) {
1269	+	idat.particlePot1 = &(snap_->atomData.particlePot[atom1]);
1270	+	idat.particlePot2 = &(snap_->atomData.particlePot[atom2]);
1271	+	}
1272	+
1273	+	if (storageLayout_ & DataStorage::dslSkippedCharge) {
1274	+	idat.skippedCharge1 = &(snap_->atomData.skippedCharge[atom1]);
1275	+	idat.skippedCharge2 = &(snap_->atomData.skippedCharge[atom2]);
1276	+	}
1277	+
1278	+	if (storageLayout_ & DataStorage::dslFlucQPosition) {
1279	+	idat.flucQ1 = &(snap_->atomData.flucQPos[atom1]);
1280	+	idat.flucQ2 = &(snap_->atomData.flucQPos[atom2]);
1281	+	}
1282	+
1283	+	#endif
1284	+	}
1285	+
1286	+
1287	+	void ForceMatrixDecomposition::unpackInteractionData(InteractionData &idat, int atom1, int atom2) {
1288	+	#ifdef IS_MPI
1289	+	pot_row[atom1] += RealType(0.5) *  *(idat.pot);
1290	+	pot_col[atom2] += RealType(0.5) *  *(idat.pot);
1291	+	expot_row[atom1] += RealType(0.5) *  *(idat.excludedPot);
1292	+	expot_col[atom2] += RealType(0.5) *  *(idat.excludedPot);
1293	+
1294	+	atomRowData.force[atom1] += *(idat.f1);
1295	+	atomColData.force[atom2] -= *(idat.f1);
1296	+
1297	+	if (storageLayout_ & DataStorage::dslFlucQForce) {
1298	+	atomRowData.flucQFrc[atom1] -= *(idat.dVdFQ1);
1299	+	atomColData.flucQFrc[atom2] -= *(idat.dVdFQ2);
1300	+	}
1301	+
1302	+	if (storageLayout_ & DataStorage::dslElectricField) {
1303	+	atomRowData.electricField[atom1] += *(idat.eField1);
1304	+	atomColData.electricField[atom2] += *(idat.eField2);
1305	+	}
1306	+
1307	+	#else
1308	+	pairwisePot += *(idat.pot);
1309	+	excludedPot += *(idat.excludedPot);
1310	+
1311	+	snap_->atomData.force[atom1] += *(idat.f1);
1312	+	snap_->atomData.force[atom2] -= *(idat.f1);
1313	+
1314	+	if (idat.doParticlePot) {
1315	+	// This is the pairwise contribution to the particle pot.  The
1316	+	// embedding contribution is added in each of the low level
1317	+	// non-bonded routines.  In parallel, this calculation is done
1318	+	// in collectData, not in unpackInteractionData.
1319	+	snap_->atomData.particlePot[atom1] += *(idat.vpair) * *(idat.sw);
1320	+	snap_->atomData.particlePot[atom2] += *(idat.vpair) * *(idat.sw);
1321	+	}
1322	+
1323	+	if (storageLayout_ & DataStorage::dslFlucQForce) {
1324	+	snap_->atomData.flucQFrc[atom1] -= *(idat.dVdFQ1);
1325	+	snap_->atomData.flucQFrc[atom2] -= *(idat.dVdFQ2);
1326	+	}
1327	+
1328	+	if (storageLayout_ & DataStorage::dslElectricField) {
1329	+	snap_->atomData.electricField[atom1] += *(idat.eField1);
1330	+	snap_->atomData.electricField[atom2] += *(idat.eField2);
1331	+	}
1332	+
1333	+	#endif
1334	+
1335	+	}
1336	+
1337	+	/*
1338	+	* buildNeighborList
1339	+	*
1340	+	* first element of pair is row-indexed CutoffGroup
1341	+	* second element of pair is column-indexed CutoffGroup
1342	+	*/
1343	+	void ForceMatrixDecomposition::buildNeighborList(vector<pair<int,int> >& neighborList) {
1344	+
1345	+	neighborList.clear();
1346	+	groupCutoffs cuts;
1347	+	bool doAllPairs = false;
1348	+
1349	+	RealType rList_ = (largestRcut_ + skinThickness_);
1350	+	RealType rcut, rcutsq, rlistsq;
1351	+	Snapshot* snap_ = sman_->getCurrentSnapshot();
1352	+	Mat3x3d box;
1353	+	Mat3x3d invBox;
1354	+
1355	+	Vector3d rs, scaled, dr;
1356	+	Vector3i whichCell;
1357	+	int cellIndex;
1358	+
1359	+	#ifdef IS_MPI
1360	+	cellListRow_.clear();
1361	+	cellListCol_.clear();
1362	+	#else
1363	+	cellList_.clear();
1364	+	#endif
1365	+
1366	+	if (!usePeriodicBoundaryConditions_) {
1367	+	box = snap_->getBoundingBox();
1368	+	invBox = snap_->getInvBoundingBox();
1369	+	} else {
1370	+	box = snap_->getHmat();
1371	+	invBox = snap_->getInvHmat();
1372	+	}
1373	+
1374	+	Vector3d boxX = box.getColumn(0);
1375	+	Vector3d boxY = box.getColumn(1);
1376	+	Vector3d boxZ = box.getColumn(2);
1377	+
1378	+	nCells_.x() = (int) ( boxX.length() )/ rList_;
1379	+	nCells_.y() = (int) ( boxY.length() )/ rList_;
1380	+	nCells_.z() = (int) ( boxZ.length() )/ rList_;
1381	+
1382	+	// handle small boxes where the cell offsets can end up repeating cells
1383	+
1384	+	if (nCells_.x() < 3) doAllPairs = true;
1385	+	if (nCells_.y() < 3) doAllPairs = true;
1386	+	if (nCells_.z() < 3) doAllPairs = true;
1387	+
1388	+	int nCtot = nCells_.x() * nCells_.y() * nCells_.z();
1389	+
1390	+	#ifdef IS_MPI
1391	+	cellListRow_.resize(nCtot);
1392	+	cellListCol_.resize(nCtot);
1393	+	#else
1394	+	cellList_.resize(nCtot);
1395	+	#endif
1396	+
1397	+	if (!doAllPairs) {
1398	+	#ifdef IS_MPI
1399	+
1400	+	for (int i = 0; i < nGroupsInRow_; i++) {
1401	+	rs = cgRowData.position[i];
1402	+
1403	+	// scaled positions relative to the box vectors
1404	+	scaled = invBox * rs;
1405	+
1406	+	// wrap the vector back into the unit box by subtracting integer box
1407	+	// numbers
1408	+	for (int j = 0; j < 3; j++) {
1409	+	scaled[j] -= roundMe(scaled[j]);
1410	+	scaled[j] += 0.5;
1411	+	// Handle the special case when an object is exactly on the
1412	+	// boundary (a scaled coordinate of 1.0 is the same as
1413	+	// scaled coordinate of 0.0)
1414	+	if (scaled[j] >= 1.0) scaled[j] -= 1.0;
1415	+	}
1416	+
1417	+	// find xyz-indices of cell that cutoffGroup is in.
1418	+	whichCell.x() = nCells_.x() * scaled.x();
1419	+	whichCell.y() = nCells_.y() * scaled.y();
1420	+	whichCell.z() = nCells_.z() * scaled.z();
1421	+
1422	+	// find single index of this cell:
1423	+	cellIndex = Vlinear(whichCell, nCells_);
1424	+
1425	+	// add this cutoff group to the list of groups in this cell;
1426	+	cellListRow_[cellIndex].push_back(i);
1427	+	}
1428	+	for (int i = 0; i < nGroupsInCol_; i++) {
1429	+	rs = cgColData.position[i];
1430	+
1431	+	// scaled positions relative to the box vectors
1432	+	scaled = invBox * rs;
1433	+
1434	+	// wrap the vector back into the unit box by subtracting integer box
1435	+	// numbers
1436	+	for (int j = 0; j < 3; j++) {
1437	+	scaled[j] -= roundMe(scaled[j]);
1438	+	scaled[j] += 0.5;
1439	+	// Handle the special case when an object is exactly on the
1440	+	// boundary (a scaled coordinate of 1.0 is the same as
1441	+	// scaled coordinate of 0.0)
1442	+	if (scaled[j] >= 1.0) scaled[j] -= 1.0;
1443	+	}
1444	+
1445	+	// find xyz-indices of cell that cutoffGroup is in.
1446	+	whichCell.x() = nCells_.x() * scaled.x();
1447	+	whichCell.y() = nCells_.y() * scaled.y();
1448	+	whichCell.z() = nCells_.z() * scaled.z();
1449	+
1450	+	// find single index of this cell:
1451	+	cellIndex = Vlinear(whichCell, nCells_);
1452	+
1453	+	// add this cutoff group to the list of groups in this cell;
1454	+	cellListCol_[cellIndex].push_back(i);
1455	+	}
1456	+
1457	+	#else
1458	+	for (int i = 0; i < nGroups_; i++) {
1459	+	rs = snap_->cgData.position[i];
1460	+
1461	+	// scaled positions relative to the box vectors
1462	+	scaled = invBox * rs;
1463	+
1464	+	// wrap the vector back into the unit box by subtracting integer box
1465	+	// numbers
1466	+	for (int j = 0; j < 3; j++) {
1467	+	scaled[j] -= roundMe(scaled[j]);
1468	+	scaled[j] += 0.5;
1469	+	// Handle the special case when an object is exactly on the
1470	+	// boundary (a scaled coordinate of 1.0 is the same as
1471	+	// scaled coordinate of 0.0)
1472	+	if (scaled[j] >= 1.0) scaled[j] -= 1.0;
1473	+	}
1474	+
1475	+	// find xyz-indices of cell that cutoffGroup is in.
1476	+	whichCell.x() = nCells_.x() * scaled.x();
1477	+	whichCell.y() = nCells_.y() * scaled.y();
1478	+	whichCell.z() = nCells_.z() * scaled.z();
1479	+
1480	+	// find single index of this cell:
1481	+	cellIndex = Vlinear(whichCell, nCells_);
1482	+
1483	+	// add this cutoff group to the list of groups in this cell;
1484	+	cellList_[cellIndex].push_back(i);
1485	+	}
1486	+
1487	+	#endif
1488	+
1489	+	for (int m1z = 0; m1z < nCells_.z(); m1z++) {
1490	+	for (int m1y = 0; m1y < nCells_.y(); m1y++) {
1491	+	for (int m1x = 0; m1x < nCells_.x(); m1x++) {
1492	+	Vector3i m1v(m1x, m1y, m1z);
1493	+	int m1 = Vlinear(m1v, nCells_);
1494	+
1495	+	for (vector<Vector3i>::iterator os = cellOffsets_.begin();
1496	+	os != cellOffsets_.end(); ++os) {
1497	+
1498	+	Vector3i m2v = m1v + (*os);
1499	+
1500	+
1501	+	if (m2v.x() >= nCells_.x()) {
1502	+	m2v.x() = 0;
1503	+	} else if (m2v.x() < 0) {
1504	+	m2v.x() = nCells_.x() - 1;
1505	+	}
1506	+
1507	+	if (m2v.y() >= nCells_.y()) {
1508	+	m2v.y() = 0;
1509	+	} else if (m2v.y() < 0) {
1510	+	m2v.y() = nCells_.y() - 1;
1511	+	}
1512	+
1513	+	if (m2v.z() >= nCells_.z()) {
1514	+	m2v.z() = 0;
1515	+	} else if (m2v.z() < 0) {
1516	+	m2v.z() = nCells_.z() - 1;
1517	+	}
1518	+
1519	+	int m2 = Vlinear (m2v, nCells_);
1520	+
1521	+	#ifdef IS_MPI
1522	+	for (vector<int>::iterator j1 = cellListRow_[m1].begin();
1523	+	j1 != cellListRow_[m1].end(); ++j1) {
1524	+	for (vector<int>::iterator j2 = cellListCol_[m2].begin();
1525	+	j2 != cellListCol_[m2].end(); ++j2) {
1526	+
1527	+	// In parallel, we need to visit *all* pairs of row
1528	+	// & column indicies and will divide labor in the
1529	+	// force evaluation later.
1530	+	dr = cgColData.position[(*j2)] - cgRowData.position[(*j1)];
1531	+	if (usePeriodicBoundaryConditions_) {
1532	+	snap_->wrapVector(dr);
1533	+	}
1534	+	getGroupCutoffs( (*j1), (*j2), rcut, rcutsq, rlistsq );
1535	+	if (dr.lengthSquare() < rlistsq) {
1536	+	neighborList.push_back(make_pair((*j1), (*j2)));
1537	+	}
1538	+	}
1539	+	}
1540	+	#else
1541	+	for (vector<int>::iterator j1 = cellList_[m1].begin();
1542	+	j1 != cellList_[m1].end(); ++j1) {
1543	+	for (vector<int>::iterator j2 = cellList_[m2].begin();
1544	+	j2 != cellList_[m2].end(); ++j2) {
1545	+
1546	+	// Always do this if we're in different cells or if
1547	+	// we're in the same cell and the global index of
1548	+	// the j2 cutoff group is greater than or equal to
1549	+	// the j1 cutoff group.  Note that Rappaport's code
1550	+	// has a "less than" conditional here, but that
1551	+	// deals with atom-by-atom computation.  OpenMD
1552	+	// allows atoms within a single cutoff group to
1553	+	// interact with each other.
1554	+
1555	+	if (m2 != m1 || (*j2) >= (*j1) ) {
1556	+
1557	+	dr = snap_->cgData.position[(*j2)] - snap_->cgData.position[(*j1)];
1558	+	if (usePeriodicBoundaryConditions_) {
1559	+	snap_->wrapVector(dr);
1560	+	}
1561	+	getGroupCutoffs( (*j1), (*j2), rcut, rcutsq, rlistsq );
1562	+	if (dr.lengthSquare() < rlistsq) {
1563	+	neighborList.push_back(make_pair((*j1), (*j2)));
1564	+	}
1565	+	}
1566	+	}
1567	+	}
1568	+	#endif
1569	+	}
1570	+	}
1571	+	}
1572	+	}
1573	+	} else {
1574	+	// branch to do all cutoff group pairs
1575	+	#ifdef IS_MPI
1576	+	for (int j1 = 0; j1 < nGroupsInRow_; j1++) {
1577	+	for (int j2 = 0; j2 < nGroupsInCol_; j2++) {
1578	+	dr = cgColData.position[j2] - cgRowData.position[j1];
1579	+	if (usePeriodicBoundaryConditions_) {
1580	+	snap_->wrapVector(dr);
1581	+	}
1582	+	getGroupCutoffs( j1, j2, rcut, rcutsq, rlistsq);
1583	+	if (dr.lengthSquare() < rlistsq) {
1584	+	neighborList.push_back(make_pair(j1, j2));
1585	+	}
1586	+	}
1587	+	}
1588	+	#else
1589	+	// include all groups here.
1590	+	for (int j1 = 0; j1 < nGroups_; j1++) {
1591	+	// include self group interactions j2 == j1
1592	+	for (int j2 = j1; j2 < nGroups_; j2++) {
1593	+	dr = snap_->cgData.position[j2] - snap_->cgData.position[j1];
1594	+	if (usePeriodicBoundaryConditions_) {
1595	+	snap_->wrapVector(dr);
1596	+	}
1597	+	getGroupCutoffs( j1, j2, rcut, rcutsq, rlistsq );
1598	+	if (dr.lengthSquare() < rlistsq) {
1599	+	neighborList.push_back(make_pair(j1, j2));
1600	+	}
1601	+	}
1602	+	}
1603	+	#endif
1604	+	}
1605	+
1606	+	// save the local cutoff group positions for the check that is
1607	+	// done on each loop:
1608	+	saved_CG_positions_.clear();
1609	+	for (int i = 0; i < nGroups_; i++)
1610	+	saved_CG_positions_.push_back(snap_->cgData.position[i]);
1611	+	}
1612	+	} //end namespace OpenMD

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