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

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branches/development/src/parallel/ForceDecomposition.cpp (file contents), Revision 1544 by gezelter, Fri Mar 18 19:31:52 2011 UTC vs.
trunk/src/parallel/ForceMatrixDecomposition.cpp (file contents), Revision 1796 by gezelter, Mon Sep 10 18:38:44 2012 UTC

#	Line 36 | Line 36
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).
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/ForceDecomposition.hpp"
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	+	// 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	+	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	+
88	+
89		/**
90		* distributeInitialData is essentially a copy of the older fortran
91		* SimulationSetup
92		*/
93	<
94	<	void ForceDecomposition::distributeInitialData() {
95	<	#ifdef IS_MPI
96	<	Snapshot* snap = sman_->getCurrentSnapshot();
97	<	int nLocal = snap->getNumberOfAtoms();
98	<	int nGroups = snap->getNumberOfCutoffGroups();
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	<	AtomCommIntI = new Communicator<Row,int>(nLocal);
61	<	AtomCommRealI = new Communicator<Row,RealType>(nLocal);
62	<	AtomCommVectorI = new Communicator<Row,Vector3d>(nLocal);
63	<	AtomCommMatrixI = new Communicator<Row,Mat3x3d>(nLocal);
106	>	massFactors = info_->getMassFactors();
107
108	<	AtomCommIntJ = new Communicator<Column,int>(nLocal);
109	<	AtomCommRealJ = new Communicator<Column,RealType>(nLocal);
110	<	AtomCommVectorJ = new Communicator<Column,Vector3d>(nLocal);
111	<	AtomCommMatrixJ = new Communicator<Column,Mat3x3d>(nLocal);
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	>
121	>	MPI::Intracomm row = rowComm.getComm();
122	>	MPI::Intracomm col = colComm.getComm();
123
124	<	cgCommIntI = new Communicator<Row,int>(nGroups);
125	<	cgCommVectorI = new Communicator<Row,Vector3d>(nGroups);
126	<	cgCommIntJ = new Communicator<Column,int>(nGroups);
127	<	cgCommVectorJ = new Communicator<Column,Vector3d>(nGroups);
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	<	int nAtomsInRow = AtomCommIntI->getSize();
131	<	int nAtomsInCol = AtomCommIntJ->getSize();
132	<	int nGroupsInRow = cgCommIntI->getSize();
133	<	int nGroupsInCol = cgCommIntJ->getSize();
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	<	vector<vector<RealType> > pot_row(N_INTERACTION_FAMILIES,
137	<	vector<RealType> (nAtomsInRow, 0.0));
138	<	vector<vector<RealType> > pot_col(N_INTERACTION_FAMILIES,
139	<	vector<RealType> (nAtomsInCol, 0.0));
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	>	nAtomsInRow_ = AtomPlanIntRow->getSize();
142	>	nAtomsInCol_ = AtomPlanIntColumn->getSize();
143	>	nGroupsInRow_ = cgPlanIntRow->getSize();
144	>	nGroupsInCol_ = cgPlanIntColumn->getSize();
145	>
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	<	vector<RealType> pot_local(N_INTERACTION_FAMILIES, 0.0);
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	<	// gather the information for atomtype IDs (atids):
172	<	AtomCommIntI->gather(info_->getIdentArray(), identsRow);
173	<	AtomCommIntJ->gather(info_->getIdentArray(), identsCol);
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	<	AtomLocalToGlobal = info_->getLocalToGlobalAtomIndex();
177	<	AtomCommIntI->gather(AtomLocalToGlobal, AtomRowToGlobal);
93	<	AtomCommIntJ->gather(AtomLocalToGlobal, AtomColToGlobal);
176	>	pot_row.resize(nAtomsInRow_);
177	>	pot_col.resize(nAtomsInCol_);
178
179	<	cgLocalToGlobal = info_->getLocalToGlobalCutoffGroupIndex();
180	<	cgCommIntI->gather(cgLocalToGlobal, cgRowToGlobal);
181	<	cgCommIntJ->gather(cgLocalToGlobal, cgColToGlobal);
179	>	expot_row.resize(nAtomsInRow_);
180	>	expot_col.resize(nAtomsInCol_);
181	>
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	>	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	+	RealType tol = 1e-6;
312	+	largestRcut_ = 0.0;
313	+	int atid;
314	+	set<AtomType*> atypes = info_->getSimulatedAtomTypes();
315	+
316	+	map<int, RealType> atypeCutoff;
317
318	+	for (set<AtomType*>::iterator at = atypes.begin();
319	+	at != atypes.end(); ++at){
320	+	atid = (*at)->getIdent();
321	+	if (userChoseCutoff_)
322	+	atypeCutoff[atid] = userCutoff_;
323	+	else
324	+	atypeCutoff[atid] = interactionMan_->getSuggestedCutoffRadius(*at);
325	+	}
326	+
327	+	vector<RealType> gTypeCutoffs;
328	+	// first we do a single loop over the cutoff groups to find the
329	+	// largest cutoff for any atypes present in this group.
330	+	#ifdef IS_MPI
331	+	vector<RealType> groupCutoffRow(nGroupsInRow_, 0.0);
332	+	groupRowToGtype.resize(nGroupsInRow_);
333	+	for (int cg1 = 0; cg1 < nGroupsInRow_; cg1++) {
334	+	vector<int> atomListRow = getAtomsInGroupRow(cg1);
335	+	for (vector<int>::iterator ia = atomListRow.begin();
336	+	ia != atomListRow.end(); ++ia) {
337	+	int atom1 = (*ia);
338	+	atid = identsRow[atom1];
339	+	if (atypeCutoff[atid] > groupCutoffRow[cg1]) {
340	+	groupCutoffRow[cg1] = atypeCutoff[atid];
341	+	}
342	+	}
343	+
344	+	bool gTypeFound = false;
345	+	for (int gt = 0; gt < gTypeCutoffs.size(); gt++) {
346	+	if (abs(groupCutoffRow[cg1] - gTypeCutoffs[gt]) < tol) {
347	+	groupRowToGtype[cg1] = gt;
348	+	gTypeFound = true;
349	+	}
350	+	}
351	+	if (!gTypeFound) {
352	+	gTypeCutoffs.push_back( groupCutoffRow[cg1] );
353	+	groupRowToGtype[cg1] = gTypeCutoffs.size() - 1;
354	+	}
355
356	+	}
357	+	vector<RealType> groupCutoffCol(nGroupsInCol_, 0.0);
358	+	groupColToGtype.resize(nGroupsInCol_);
359	+	for (int cg2 = 0; cg2 < nGroupsInCol_; cg2++) {
360	+	vector<int> atomListCol = getAtomsInGroupColumn(cg2);
361	+	for (vector<int>::iterator jb = atomListCol.begin();
362	+	jb != atomListCol.end(); ++jb) {
363	+	int atom2 = (*jb);
364	+	atid = identsCol[atom2];
365	+	if (atypeCutoff[atid] > groupCutoffCol[cg2]) {
366	+	groupCutoffCol[cg2] = atypeCutoff[atid];
367	+	}
368	+	}
369	+	bool gTypeFound = false;
370	+	for (int gt = 0; gt < gTypeCutoffs.size(); gt++) {
371	+	if (abs(groupCutoffCol[cg2] - gTypeCutoffs[gt]) < tol) {
372	+	groupColToGtype[cg2] = gt;
373	+	gTypeFound = true;
374	+	}
375	+	}
376	+	if (!gTypeFound) {
377	+	gTypeCutoffs.push_back( groupCutoffCol[cg2] );
378	+	groupColToGtype[cg2] = gTypeCutoffs.size() - 1;
379	+	}
380	+	}
381	+	#else
382
383	+	vector<RealType> groupCutoff(nGroups_, 0.0);
384	+	groupToGtype.resize(nGroups_);
385	+	for (int cg1 = 0; cg1 < nGroups_; cg1++) {
386	+	groupCutoff[cg1] = 0.0;
387	+	vector<int> atomList = getAtomsInGroupRow(cg1);
388	+	for (vector<int>::iterator ia = atomList.begin();
389	+	ia != atomList.end(); ++ia) {
390	+	int atom1 = (*ia);
391	+	atid = idents[atom1];
392	+	if (atypeCutoff[atid] > groupCutoff[cg1])
393	+	groupCutoff[cg1] = atypeCutoff[atid];
394	+	}
395	+
396	+	bool gTypeFound = false;
397	+	for (unsigned int gt = 0; gt < gTypeCutoffs.size(); gt++) {
398	+	if (abs(groupCutoff[cg1] - gTypeCutoffs[gt]) < tol) {
399	+	groupToGtype[cg1] = gt;
400	+	gTypeFound = true;
401	+	}
402	+	}
403	+	if (!gTypeFound) {
404	+	gTypeCutoffs.push_back( groupCutoff[cg1] );
405	+	groupToGtype[cg1] = gTypeCutoffs.size() - 1;
406	+	}
407	+	}
408	+	#endif
409
410	+	// Now we find the maximum group cutoff value present in the simulation
411
412	<	// still need:
413	<	// topoDist
414	<	// exclude
412	>	RealType groupMax = *max_element(gTypeCutoffs.begin(),
413	>	gTypeCutoffs.end());
414	>
415	>	#ifdef IS_MPI
416	>	MPI::COMM_WORLD.Allreduce(&groupMax, &groupMax, 1, MPI::REALTYPE,
417	>	MPI::MAX);
418		#endif
419	+
420	+	RealType tradRcut = groupMax;
421	+
422	+	for (unsigned int i = 0; i < gTypeCutoffs.size();  i++) {
423	+	for (unsigned int j = 0; j < gTypeCutoffs.size();  j++) {
424	+	RealType thisRcut;
425	+	switch(cutoffPolicy_) {
426	+	case TRADITIONAL:
427	+	thisRcut = tradRcut;
428	+	break;
429	+	case MIX:
430	+	thisRcut = 0.5 * (gTypeCutoffs[i] + gTypeCutoffs[j]);
431	+	break;
432	+	case MAX:
433	+	thisRcut = max(gTypeCutoffs[i], gTypeCutoffs[j]);
434	+	break;
435	+	default:
436	+	sprintf(painCave.errMsg,
437	+	"ForceMatrixDecomposition::createGtypeCutoffMap "
438	+	"hit an unknown cutoff policy!\n");
439	+	painCave.severity = OPENMD_ERROR;
440	+	painCave.isFatal = 1;
441	+	simError();
442	+	break;
443	+	}
444	+
445	+	pair<int,int> key = make_pair(i,j);
446	+	gTypeCutoffMap[key].first = thisRcut;
447	+	if (thisRcut > largestRcut_) largestRcut_ = thisRcut;
448	+	gTypeCutoffMap[key].second = thisRcut*thisRcut;
449	+	gTypeCutoffMap[key].third = pow(thisRcut + skinThickness_, 2);
450	+	// sanity check
451	+
452	+	if (userChoseCutoff_) {
453	+	if (abs(gTypeCutoffMap[key].first - userCutoff_) > 0.0001) {
454	+	sprintf(painCave.errMsg,
455	+	"ForceMatrixDecomposition::createGtypeCutoffMap "
456	+	"user-specified rCut (%lf) does not match computed group Cutoff\n", userCutoff_);
457	+	painCave.severity = OPENMD_ERROR;
458	+	painCave.isFatal = 1;
459	+	simError();
460	+	}
461	+	}
462	+	}
463	+	}
464		}
465	+
466	+	groupCutoffs ForceMatrixDecomposition::getGroupCutoffs(int cg1, int cg2) {
467	+	int i, j;
468	+	#ifdef IS_MPI
469	+	i = groupRowToGtype[cg1];
470	+	j = groupColToGtype[cg2];
471	+	#else
472	+	i = groupToGtype[cg1];
473	+	j = groupToGtype[cg2];
474	+	#endif
475	+	return gTypeCutoffMap[make_pair(i,j)];
476	+	}
477	+
478	+	int ForceMatrixDecomposition::getTopologicalDistance(int atom1, int atom2) {
479	+	for (unsigned int j = 0; j < toposForAtom[atom1].size(); j++) {
480	+	if (toposForAtom[atom1][j] == atom2)
481	+	return topoDist[atom1][j];
482	+	}
483	+	return 0;
484	+	}
485	+
486	+	void ForceMatrixDecomposition::zeroWorkArrays() {
487	+	pairwisePot = 0.0;
488	+	embeddingPot = 0.0;
489	+	excludedPot = 0.0;
490	+	excludedSelfPot = 0.0;
491	+
492	+	#ifdef IS_MPI
493	+	if (storageLayout_ & DataStorage::dslForce) {
494	+	fill(atomRowData.force.begin(), atomRowData.force.end(), V3Zero);
495	+	fill(atomColData.force.begin(), atomColData.force.end(), V3Zero);
496	+	}
497	+
498	+	if (storageLayout_ & DataStorage::dslTorque) {
499	+	fill(atomRowData.torque.begin(), atomRowData.torque.end(), V3Zero);
500	+	fill(atomColData.torque.begin(), atomColData.torque.end(), V3Zero);
501	+	}
502
503	+	fill(pot_row.begin(), pot_row.end(),
504	+	Vector<RealType, N_INTERACTION_FAMILIES> (0.0));
505
506	+	fill(pot_col.begin(), pot_col.end(),
507	+	Vector<RealType, N_INTERACTION_FAMILIES> (0.0));
508
509	<	void ForceDecomposition::distributeData()  {
509	>	fill(expot_row.begin(), expot_row.end(),
510	>	Vector<RealType, N_INTERACTION_FAMILIES> (0.0));
511	>
512	>	fill(expot_col.begin(), expot_col.end(),
513	>	Vector<RealType, N_INTERACTION_FAMILIES> (0.0));
514	>
515	>	if (storageLayout_ & DataStorage::dslParticlePot) {
516	>	fill(atomRowData.particlePot.begin(), atomRowData.particlePot.end(),
517	>	0.0);
518	>	fill(atomColData.particlePot.begin(), atomColData.particlePot.end(),
519	>	0.0);
520	>	}
521	>
522	>	if (storageLayout_ & DataStorage::dslDensity) {
523	>	fill(atomRowData.density.begin(), atomRowData.density.end(), 0.0);
524	>	fill(atomColData.density.begin(), atomColData.density.end(), 0.0);
525	>	}
526	>
527	>	if (storageLayout_ & DataStorage::dslFunctional) {
528	>	fill(atomRowData.functional.begin(), atomRowData.functional.end(),
529	>	0.0);
530	>	fill(atomColData.functional.begin(), atomColData.functional.end(),
531	>	0.0);
532	>	}
533	>
534	>	if (storageLayout_ & DataStorage::dslFunctionalDerivative) {
535	>	fill(atomRowData.functionalDerivative.begin(),
536	>	atomRowData.functionalDerivative.end(), 0.0);
537	>	fill(atomColData.functionalDerivative.begin(),
538	>	atomColData.functionalDerivative.end(), 0.0);
539	>	}
540	>
541	>	if (storageLayout_ & DataStorage::dslSkippedCharge) {
542	>	fill(atomRowData.skippedCharge.begin(),
543	>	atomRowData.skippedCharge.end(), 0.0);
544	>	fill(atomColData.skippedCharge.begin(),
545	>	atomColData.skippedCharge.end(), 0.0);
546	>	}
547	>
548	>	if (storageLayout_ & DataStorage::dslFlucQForce) {
549	>	fill(atomRowData.flucQFrc.begin(),
550	>	atomRowData.flucQFrc.end(), 0.0);
551	>	fill(atomColData.flucQFrc.begin(),
552	>	atomColData.flucQFrc.end(), 0.0);
553	>	}
554	>
555	>	if (storageLayout_ & DataStorage::dslElectricField) {
556	>	fill(atomRowData.electricField.begin(),
557	>	atomRowData.electricField.end(), V3Zero);
558	>	fill(atomColData.electricField.begin(),
559	>	atomColData.electricField.end(), V3Zero);
560	>	}
561	>
562	>	if (storageLayout_ & DataStorage::dslFlucQForce) {
563	>	fill(atomRowData.flucQFrc.begin(), atomRowData.flucQFrc.end(),
564	>	0.0);
565	>	fill(atomColData.flucQFrc.begin(), atomColData.flucQFrc.end(),
566	>	0.0);
567	>	}
568	>
569	>	#endif
570	>	// even in parallel, we need to zero out the local arrays:
571	>
572	>	if (storageLayout_ & DataStorage::dslParticlePot) {
573	>	fill(snap_->atomData.particlePot.begin(),
574	>	snap_->atomData.particlePot.end(), 0.0);
575	>	}
576	>
577	>	if (storageLayout_ & DataStorage::dslDensity) {
578	>	fill(snap_->atomData.density.begin(),
579	>	snap_->atomData.density.end(), 0.0);
580	>	}
581	>
582	>	if (storageLayout_ & DataStorage::dslFunctional) {
583	>	fill(snap_->atomData.functional.begin(),
584	>	snap_->atomData.functional.end(), 0.0);
585	>	}
586	>
587	>	if (storageLayout_ & DataStorage::dslFunctionalDerivative) {
588	>	fill(snap_->atomData.functionalDerivative.begin(),
589	>	snap_->atomData.functionalDerivative.end(), 0.0);
590	>	}
591	>
592	>	if (storageLayout_ & DataStorage::dslSkippedCharge) {
593	>	fill(snap_->atomData.skippedCharge.begin(),
594	>	snap_->atomData.skippedCharge.end(), 0.0);
595	>	}
596	>
597	>	if (storageLayout_ & DataStorage::dslElectricField) {
598	>	fill(snap_->atomData.electricField.begin(),
599	>	snap_->atomData.electricField.end(), V3Zero);
600	>	}
601	>	}
602	>
603	>
604	>	void ForceMatrixDecomposition::distributeData()  {
605	>	snap_ = sman_->getCurrentSnapshot();
606	>	storageLayout_ = sman_->getStorageLayout();
607		#ifdef IS_MPI
114	–	Snapshot* snap = sman_->getCurrentSnapshot();
608
609		// gather up the atomic positions
610	<	AtomCommVectorI->gather(snap->atomData.position,
611	<	snap->atomIData.position);
612	<	AtomCommVectorJ->gather(snap->atomData.position,
613	<	snap->atomJData.position);
610	>	AtomPlanVectorRow->gather(snap_->atomData.position,
611	>	atomRowData.position);
612	>	AtomPlanVectorColumn->gather(snap_->atomData.position,
613	>	atomColData.position);
614
615		// gather up the cutoff group positions
616	<	cgCommVectorI->gather(snap->cgData.position,
617	<	snap->cgIData.position);
618	<	cgCommVectorJ->gather(snap->cgData.position,
619	<	snap->cgJData.position);
616	>
617	>	cgPlanVectorRow->gather(snap_->cgData.position,
618	>	cgRowData.position);
619	>
620	>	cgPlanVectorColumn->gather(snap_->cgData.position,
621	>	cgColData.position);
622	>
623	>
624	>
625	>	if (needVelocities_) {
626	>	// gather up the atomic velocities
627	>	AtomPlanVectorColumn->gather(snap_->atomData.velocity,
628	>	atomColData.velocity);
629	>
630	>	cgPlanVectorColumn->gather(snap_->cgData.velocity,
631	>	cgColData.velocity);
632	>	}
633	>
634
635		// if needed, gather the atomic rotation matrices
636	<	if (snap->atomData.getStorageLayout() & DataStorage::dslAmat) {
637	<	AtomCommMatrixI->gather(snap->atomData.aMat,
638	<	snap->atomIData.aMat);
639	<	AtomCommMatrixJ->gather(snap->atomData.aMat,
640	<	snap->atomJData.aMat);
636	>	if (storageLayout_ & DataStorage::dslAmat) {
637	>	AtomPlanMatrixRow->gather(snap_->atomData.aMat,
638	>	atomRowData.aMat);
639	>	AtomPlanMatrixColumn->gather(snap_->atomData.aMat,
640	>	atomColData.aMat);
641		}
642
643		// if needed, gather the atomic eletrostatic frames
644	<	if (snap->atomData.getStorageLayout() & DataStorage::dslElectroFrame) {
645	<	AtomCommMatrixI->gather(snap->atomData.electroFrame,
646	<	snap->atomIData.electroFrame);
647	<	AtomCommMatrixJ->gather(snap->atomData.electroFrame,
648	<	snap->atomJData.electroFrame);
644	>	if (storageLayout_ & DataStorage::dslElectroFrame) {
645	>	AtomPlanMatrixRow->gather(snap_->atomData.electroFrame,
646	>	atomRowData.electroFrame);
647	>	AtomPlanMatrixColumn->gather(snap_->atomData.electroFrame,
648	>	atomColData.electroFrame);
649		}
650	+
651	+	// if needed, gather the atomic fluctuating charge values
652	+	if (storageLayout_ & DataStorage::dslFlucQPosition) {
653	+	AtomPlanRealRow->gather(snap_->atomData.flucQPos,
654	+	atomRowData.flucQPos);
655	+	AtomPlanRealColumn->gather(snap_->atomData.flucQPos,
656	+	atomColData.flucQPos);
657	+	}
658	+
659		#endif
660		}
661
662	<	void ForceDecomposition::collectIntermediateData() {
662	>	/* collects information obtained during the pre-pair loop onto local
663	>	* data structures.
664	>	*/
665	>	void ForceMatrixDecomposition::collectIntermediateData() {
666	>	snap_ = sman_->getCurrentSnapshot();
667	>	storageLayout_ = sman_->getStorageLayout();
668		#ifdef IS_MPI
148	–	Snapshot* snap = sman_->getCurrentSnapshot();
669
670	<	if (snap->atomData.getStorageLayout() & DataStorage::dslDensity) {
670	>	if (storageLayout_ & DataStorage::dslDensity) {
671	>
672	>	AtomPlanRealRow->scatter(atomRowData.density,
673	>	snap_->atomData.density);
674	>
675	>	int n = snap_->atomData.density.size();
676	>	vector<RealType> rho_tmp(n, 0.0);
677	>	AtomPlanRealColumn->scatter(atomColData.density, rho_tmp);
678	>	for (int i = 0; i < n; i++)
679	>	snap_->atomData.density[i] += rho_tmp[i];
680	>	}
681
682	<	AtomCommRealI->scatter(snap->atomIData.density,
683	<	snap->atomData.density);
684	<
685	<	int n = snap->atomData.density.size();
686	<	std::vector<RealType> rho_tmp(n, 0.0);
687	<	AtomCommRealJ->scatter(snap->atomJData.density, rho_tmp);
682	>	if (storageLayout_ & DataStorage::dslElectricField) {
683	>
684	>	AtomPlanVectorRow->scatter(atomRowData.electricField,
685	>	snap_->atomData.electricField);
686	>
687	>	int n = snap_->atomData.electricField.size();
688	>	vector<Vector3d> field_tmp(n, V3Zero);
689	>	AtomPlanVectorColumn->scatter(atomColData.electricField, field_tmp);
690		for (int i = 0; i < n; i++)
691	<	snap->atomData.density[i] += rho_tmp[i];
691	>	snap_->atomData.electricField[i] += field_tmp[i];
692		}
693		#endif
694		}
695	<
696	<	void ForceDecomposition::distributeIntermediateData() {
695	>
696	>	/*
697	>	* redistributes information obtained during the pre-pair loop out to
698	>	* row and column-indexed data structures
699	>	*/
700	>	void ForceMatrixDecomposition::distributeIntermediateData() {
701	>	snap_ = sman_->getCurrentSnapshot();
702	>	storageLayout_ = sman_->getStorageLayout();
703		#ifdef IS_MPI
704	<	Snapshot* snap = sman_->getCurrentSnapshot();
705	<	if (snap->atomData.getStorageLayout() & DataStorage::dslFunctional) {
706	<	AtomCommRealI->gather(snap->atomData.functional,
707	<	snap->atomIData.functional);
708	<	AtomCommRealJ->gather(snap->atomData.functional,
171	<	snap->atomJData.functional);
704	>	if (storageLayout_ & DataStorage::dslFunctional) {
705	>	AtomPlanRealRow->gather(snap_->atomData.functional,
706	>	atomRowData.functional);
707	>	AtomPlanRealColumn->gather(snap_->atomData.functional,
708	>	atomColData.functional);
709		}
710
711	<	if (snap->atomData.getStorageLayout() & DataStorage::dslFunctionalDerivative) {
712	<	AtomCommRealI->gather(snap->atomData.functionalDerivative,
713	<	snap->atomIData.functionalDerivative);
714	<	AtomCommRealJ->gather(snap->atomData.functionalDerivative,
715	<	snap->atomJData.functionalDerivative);
711	>	if (storageLayout_ & DataStorage::dslFunctionalDerivative) {
712	>	AtomPlanRealRow->gather(snap_->atomData.functionalDerivative,
713	>	atomRowData.functionalDerivative);
714	>	AtomPlanRealColumn->gather(snap_->atomData.functionalDerivative,
715	>	atomColData.functionalDerivative);
716		}
717		#endif
718		}
719
720
721	<	void ForceDecomposition::collectData() {
722	<	#ifdef IS_MPI
723	<	Snapshot* snap = sman_->getCurrentSnapshot();
724	<
725	<	int n = snap->atomData.force.size();
721	>	void ForceMatrixDecomposition::collectData() {
722	>	snap_ = sman_->getCurrentSnapshot();
723	>	storageLayout_ = sman_->getStorageLayout();
724	>	#ifdef IS_MPI
725	>	int n = snap_->atomData.force.size();
726		vector<Vector3d> frc_tmp(n, V3Zero);
727
728	<	AtomCommVectorI->scatter(snap->atomIData.force, frc_tmp);
728	>	AtomPlanVectorRow->scatter(atomRowData.force, frc_tmp);
729		for (int i = 0; i < n; i++) {
730	<	snap->atomData.force[i] += frc_tmp[i];
730	>	snap_->atomData.force[i] += frc_tmp[i];
731		frc_tmp[i] = 0.0;
732		}
733
734	<	AtomCommVectorJ->scatter(snap->atomJData.force, frc_tmp);
735	<	for (int i = 0; i < n; i++)
736	<	snap->atomData.force[i] += frc_tmp[i];
737	<
738	<
739	<	if (snap->atomData.getStorageLayout() & DataStorage::dslTorque) {
734	>	AtomPlanVectorColumn->scatter(atomColData.force, frc_tmp);
735	>	for (int i = 0; i < n; i++) {
736	>	snap_->atomData.force[i] += frc_tmp[i];
737	>	}
738	>
739	>	if (storageLayout_ & DataStorage::dslTorque) {
740
741	<	int nt = snap->atomData.force.size();
741	>	int nt = snap_->atomData.torque.size();
742		vector<Vector3d> trq_tmp(nt, V3Zero);
743
744	<	AtomCommVectorI->scatter(snap->atomIData.torque, trq_tmp);
745	<	for (int i = 0; i < n; i++) {
746	<	snap->atomData.torque[i] += trq_tmp[i];
744	>	AtomPlanVectorRow->scatter(atomRowData.torque, trq_tmp);
745	>	for (int i = 0; i < nt; i++) {
746	>	snap_->atomData.torque[i] += trq_tmp[i];
747		trq_tmp[i] = 0.0;
748		}
749
750	<	AtomCommVectorJ->scatter(snap->atomJData.torque, trq_tmp);
751	<	for (int i = 0; i < n; i++)
752	<	snap->atomData.torque[i] += trq_tmp[i];
750	>	AtomPlanVectorColumn->scatter(atomColData.torque, trq_tmp);
751	>	for (int i = 0; i < nt; i++)
752	>	snap_->atomData.torque[i] += trq_tmp[i];
753		}
217	–
218	–	int nLocal = snap->getNumberOfAtoms();
754
755	<	vector<vector<RealType> > pot_temp(N_INTERACTION_FAMILIES,
756	<	vector<RealType> (nLocal, 0.0));
755	>	if (storageLayout_ & DataStorage::dslSkippedCharge) {
756	>
757	>	int ns = snap_->atomData.skippedCharge.size();
758	>	vector<RealType> skch_tmp(ns, 0.0);
759	>
760	>	AtomPlanRealRow->scatter(atomRowData.skippedCharge, skch_tmp);
761	>	for (int i = 0; i < ns; i++) {
762	>	snap_->atomData.skippedCharge[i] += skch_tmp[i];
763	>	skch_tmp[i] = 0.0;
764	>	}
765	>
766	>	AtomPlanRealColumn->scatter(atomColData.skippedCharge, skch_tmp);
767	>	for (int i = 0; i < ns; i++)
768	>	snap_->atomData.skippedCharge[i] += skch_tmp[i];
769	>
770	>	}
771	>
772	>	if (storageLayout_ & DataStorage::dslFlucQForce) {
773	>
774	>	int nq = snap_->atomData.flucQFrc.size();
775	>	vector<RealType> fqfrc_tmp(nq, 0.0);
776	>
777	>	AtomPlanRealRow->scatter(atomRowData.flucQFrc, fqfrc_tmp);
778	>	for (int i = 0; i < nq; i++) {
779	>	snap_->atomData.flucQFrc[i] += fqfrc_tmp[i];
780	>	fqfrc_tmp[i] = 0.0;
781	>	}
782	>
783	>	AtomPlanRealColumn->scatter(atomColData.flucQFrc, fqfrc_tmp);
784	>	for (int i = 0; i < nq; i++)
785	>	snap_->atomData.flucQFrc[i] += fqfrc_tmp[i];
786	>
787	>	}
788	>
789	>	nLocal_ = snap_->getNumberOfAtoms();
790	>
791	>	vector<potVec> pot_temp(nLocal_,
792	>	Vector<RealType, N_INTERACTION_FAMILIES> (0.0));
793	>	vector<potVec> expot_temp(nLocal_,
794	>	Vector<RealType, N_INTERACTION_FAMILIES> (0.0));
795	>
796	>	// scatter/gather pot_row into the members of my column
797	>
798	>	AtomPlanPotRow->scatter(pot_row, pot_temp);
799	>	AtomPlanPotRow->scatter(expot_row, expot_temp);
800	>
801	>	for (int ii = 0;  ii < pot_temp.size(); ii++ )
802	>	pairwisePot += pot_temp[ii];
803	>
804	>	for (int ii = 0;  ii < expot_temp.size(); ii++ )
805	>	excludedPot += expot_temp[ii];
806	>
807	>	if (storageLayout_ & DataStorage::dslParticlePot) {
808	>	// This is the pairwise contribution to the particle pot.  The
809	>	// embedding contribution is added in each of the low level
810	>	// non-bonded routines.  In single processor, this is done in
811	>	// unpackInteractionData, not in collectData.
812	>	for (int ii = 0; ii < N_INTERACTION_FAMILIES; ii++) {
813	>	for (int i = 0; i < nLocal_; i++) {
814	>	// factor of two is because the total potential terms are divided
815	>	// by 2 in parallel due to row/ column scatter
816	>	snap_->atomData.particlePot[i] += 2.0 * pot_temp[i](ii);
817	>	}
818	>	}
819	>	}
820	>
821	>	fill(pot_temp.begin(), pot_temp.end(),
822	>	Vector<RealType, N_INTERACTION_FAMILIES> (0.0));
823	>	fill(expot_temp.begin(), expot_temp.end(),
824	>	Vector<RealType, N_INTERACTION_FAMILIES> (0.0));
825	>
826	>	AtomPlanPotColumn->scatter(pot_col, pot_temp);
827	>	AtomPlanPotColumn->scatter(expot_col, expot_temp);
828
829	<	for (int i = 0; i < N_INTERACTION_FAMILIES; i++) {
830	<	AtomCommRealI->scatter(pot_row[i], pot_temp[i]);
831	<	for (int ii = 0;  ii < pot_temp[i].size(); ii++ ) {
832	<	pot_local[i] += pot_temp[i][ii];
829	>	for (int ii = 0;  ii < pot_temp.size(); ii++ )
830	>	pairwisePot += pot_temp[ii];
831	>
832	>	for (int ii = 0;  ii < expot_temp.size(); ii++ )
833	>	excludedPot += expot_temp[ii];
834	>
835	>	if (storageLayout_ & DataStorage::dslParticlePot) {
836	>	// This is the pairwise contribution to the particle pot.  The
837	>	// embedding contribution is added in each of the low level
838	>	// non-bonded routines.  In single processor, this is done in
839	>	// unpackInteractionData, not in collectData.
840	>	for (int ii = 0; ii < N_INTERACTION_FAMILIES; ii++) {
841	>	for (int i = 0; i < nLocal_; i++) {
842	>	// factor of two is because the total potential terms are divided
843	>	// by 2 in parallel due to row/ column scatter
844	>	snap_->atomData.particlePot[i] += 2.0 * pot_temp[i](ii);
845	>	}
846		}
847	+	}
848	+
849	+	if (storageLayout_ & DataStorage::dslParticlePot) {
850	+	int npp = snap_->atomData.particlePot.size();
851	+	vector<RealType> ppot_temp(npp, 0.0);
852	+
853	+	// This is the direct or embedding contribution to the particle
854	+	// pot.
855	+
856	+	AtomPlanRealRow->scatter(atomRowData.particlePot, ppot_temp);
857	+	for (int i = 0; i < npp; i++) {
858	+	snap_->atomData.particlePot[i] += ppot_temp[i];
859	+	}
860	+
861	+	fill(ppot_temp.begin(), ppot_temp.end(), 0.0);
862	+
863	+	AtomPlanRealColumn->scatter(atomColData.particlePot, ppot_temp);
864	+	for (int i = 0; i < npp; i++) {
865	+	snap_->atomData.particlePot[i] += ppot_temp[i];
866	+	}
867	+	}
868	+
869	+	for (int ii = 0; ii < N_INTERACTION_FAMILIES; ii++) {
870	+	RealType ploc1 = pairwisePot[ii];
871	+	RealType ploc2 = 0.0;
872	+	MPI::COMM_WORLD.Allreduce(&ploc1, &ploc2, 1, MPI::REALTYPE, MPI::SUM);
873	+	pairwisePot[ii] = ploc2;
874	+	}
875	+
876	+	for (int ii = 0; ii < N_INTERACTION_FAMILIES; ii++) {
877	+	RealType ploc1 = excludedPot[ii];
878	+	RealType ploc2 = 0.0;
879	+	MPI::COMM_WORLD.Allreduce(&ploc1, &ploc2, 1, MPI::REALTYPE, MPI::SUM);
880	+	excludedPot[ii] = ploc2;
881	+	}
882	+
883	+	// Here be dragons.
884	+	MPI::Intracomm col = colComm.getComm();
885	+
886	+	col.Allreduce(MPI::IN_PLACE,
887	+	&snap_->frameData.conductiveHeatFlux[0], 3,
888	+	MPI::REALTYPE, MPI::SUM);
889	+
890	+
891	+	#endif
892	+
893	+	}
894	+
895	+	/**
896	+	* Collects information obtained during the post-pair (and embedding
897	+	* functional) loops onto local data structures.
898	+	*/
899	+	void ForceMatrixDecomposition::collectSelfData() {
900	+	snap_ = sman_->getCurrentSnapshot();
901	+	storageLayout_ = sman_->getStorageLayout();
902	+
903	+	#ifdef IS_MPI
904	+	for (int ii = 0; ii < N_INTERACTION_FAMILIES; ii++) {
905	+	RealType ploc1 = embeddingPot[ii];
906	+	RealType ploc2 = 0.0;
907	+	MPI::COMM_WORLD.Allreduce(&ploc1, &ploc2, 1, MPI::REALTYPE, MPI::SUM);
908	+	embeddingPot[ii] = ploc2;
909	+	}
910	+	for (int ii = 0; ii < N_INTERACTION_FAMILIES; ii++) {
911	+	RealType ploc1 = excludedSelfPot[ii];
912	+	RealType ploc2 = 0.0;
913	+	MPI::COMM_WORLD.Allreduce(&ploc1, &ploc2, 1, MPI::REALTYPE, MPI::SUM);
914	+	excludedSelfPot[ii] = ploc2;
915	+	}
916	+	#endif
917	+
918	+	}
919	+
920	+
921	+
922	+	int ForceMatrixDecomposition::getNAtomsInRow() {
923	+	#ifdef IS_MPI
924	+	return nAtomsInRow_;
925	+	#else
926	+	return nLocal_;
927	+	#endif
928	+	}
929	+
930	+	/**
931	+	* returns the list of atoms belonging to this group.
932	+	*/
933	+	vector<int> ForceMatrixDecomposition::getAtomsInGroupRow(int cg1){
934	+	#ifdef IS_MPI
935	+	return groupListRow_[cg1];
936	+	#else
937	+	return groupList_[cg1];
938	+	#endif
939	+	}
940	+
941	+	vector<int> ForceMatrixDecomposition::getAtomsInGroupColumn(int cg2){
942	+	#ifdef IS_MPI
943	+	return groupListCol_[cg2];
944	+	#else
945	+	return groupList_[cg2];
946	+	#endif
947	+	}
948	+
949	+	Vector3d ForceMatrixDecomposition::getIntergroupVector(int cg1, int cg2){
950	+	Vector3d d;
951	+
952	+	#ifdef IS_MPI
953	+	d = cgColData.position[cg2] - cgRowData.position[cg1];
954	+	#else
955	+	d = snap_->cgData.position[cg2] - snap_->cgData.position[cg1];
956	+	#endif
957	+
958	+	snap_->wrapVector(d);
959	+	return d;
960	+	}
961	+
962	+	Vector3d ForceMatrixDecomposition::getGroupVelocityColumn(int cg2){
963	+	#ifdef IS_MPI
964	+	return cgColData.velocity[cg2];
965	+	#else
966	+	return snap_->cgData.velocity[cg2];
967	+	#endif
968	+	}
969	+
970	+	Vector3d ForceMatrixDecomposition::getAtomVelocityColumn(int atom2){
971	+	#ifdef IS_MPI
972	+	return atomColData.velocity[atom2];
973	+	#else
974	+	return snap_->atomData.velocity[atom2];
975	+	#endif
976	+	}
977	+
978	+
979	+	Vector3d ForceMatrixDecomposition::getAtomToGroupVectorRow(int atom1, int cg1){
980	+
981	+	Vector3d d;
982	+
983	+	#ifdef IS_MPI
984	+	d = cgRowData.position[cg1] - atomRowData.position[atom1];
985	+	#else
986	+	d = snap_->cgData.position[cg1] - snap_->atomData.position[atom1];
987	+	#endif
988	+
989	+	snap_->wrapVector(d);
990	+	return d;
991	+	}
992	+
993	+	Vector3d ForceMatrixDecomposition::getAtomToGroupVectorColumn(int atom2, int cg2){
994	+	Vector3d d;
995	+
996	+	#ifdef IS_MPI
997	+	d = cgColData.position[cg2] - atomColData.position[atom2];
998	+	#else
999	+	d = snap_->cgData.position[cg2] - snap_->atomData.position[atom2];
1000	+	#endif
1001	+
1002	+	snap_->wrapVector(d);
1003	+	return d;
1004	+	}
1005	+
1006	+	RealType ForceMatrixDecomposition::getMassFactorRow(int atom1) {
1007	+	#ifdef IS_MPI
1008	+	return massFactorsRow[atom1];
1009	+	#else
1010	+	return massFactors[atom1];
1011	+	#endif
1012	+	}
1013	+
1014	+	RealType ForceMatrixDecomposition::getMassFactorColumn(int atom2) {
1015	+	#ifdef IS_MPI
1016	+	return massFactorsCol[atom2];
1017	+	#else
1018	+	return massFactors[atom2];
1019	+	#endif
1020	+
1021	+	}
1022	+
1023	+	Vector3d ForceMatrixDecomposition::getInteratomicVector(int atom1, int atom2){
1024	+	Vector3d d;
1025	+
1026	+	#ifdef IS_MPI
1027	+	d = atomColData.position[atom2] - atomRowData.position[atom1];
1028	+	#else
1029	+	d = snap_->atomData.position[atom2] - snap_->atomData.position[atom1];
1030	+	#endif
1031	+
1032	+	snap_->wrapVector(d);
1033	+	return d;
1034	+	}
1035	+
1036	+	vector<int> ForceMatrixDecomposition::getExcludesForAtom(int atom1) {
1037	+	return excludesForAtom[atom1];
1038	+	}
1039	+
1040	+	/**
1041	+	* We need to exclude some overcounted interactions that result from
1042	+	* the parallel decomposition.
1043	+	*/
1044	+	bool ForceMatrixDecomposition::skipAtomPair(int atom1, int atom2, int cg1, int cg2) {
1045	+	int unique_id_1, unique_id_2;
1046	+
1047	+	#ifdef IS_MPI
1048	+	// in MPI, we have to look up the unique IDs for each atom
1049	+	unique_id_1 = AtomRowToGlobal[atom1];
1050	+	unique_id_2 = AtomColToGlobal[atom2];
1051	+	// group1 = cgRowToGlobal[cg1];
1052	+	// group2 = cgColToGlobal[cg2];
1053	+	#else
1054	+	unique_id_1 = AtomLocalToGlobal[atom1];
1055	+	unique_id_2 = AtomLocalToGlobal[atom2];
1056	+	int group1 = cgLocalToGlobal[cg1];
1057	+	int group2 = cgLocalToGlobal[cg2];
1058	+	#endif
1059	+
1060	+	if (unique_id_1 == unique_id_2) return true;
1061	+
1062	+	#ifdef IS_MPI
1063	+	// this prevents us from doing the pair on multiple processors
1064	+	if (unique_id_1 < unique_id_2) {
1065	+	if ((unique_id_1 + unique_id_2) % 2 == 0) return true;
1066	+	} else {
1067	+	if ((unique_id_1 + unique_id_2) % 2 == 1) return true;
1068	+	}
1069	+	#endif
1070	+
1071	+	#ifndef IS_MPI
1072	+	if (group1 == group2) {
1073	+	if (unique_id_1 < unique_id_2) return true;
1074	+	}
1075	+	#endif
1076	+
1077	+	return false;
1078	+	}
1079	+
1080	+	/**
1081	+	* We need to handle the interactions for atoms who are involved in
1082	+	* the same rigid body as well as some short range interactions
1083	+	* (bonds, bends, torsions) differently from other interactions.
1084	+	* We'll still visit the pairwise routines, but with a flag that
1085	+	* tells those routines to exclude the pair from direct long range
1086	+	* interactions.  Some indirect interactions (notably reaction
1087	+	* field) must still be handled for these pairs.
1088	+	*/
1089	+	bool ForceMatrixDecomposition::excludeAtomPair(int atom1, int atom2) {
1090	+
1091	+	// excludesForAtom was constructed to use row/column indices in the MPI
1092	+	// version, and to use local IDs in the non-MPI version:
1093	+
1094	+	for (vector<int>::iterator i = excludesForAtom[atom1].begin();
1095	+	i != excludesForAtom[atom1].end(); ++i) {
1096	+	if ( (*i) == atom2 ) return true;
1097	+	}
1098	+
1099	+	return false;
1100	+	}
1101	+
1102	+
1103	+	void ForceMatrixDecomposition::addForceToAtomRow(int atom1, Vector3d fg){
1104	+	#ifdef IS_MPI
1105	+	atomRowData.force[atom1] += fg;
1106	+	#else
1107	+	snap_->atomData.force[atom1] += fg;
1108	+	#endif
1109	+	}
1110	+
1111	+	void ForceMatrixDecomposition::addForceToAtomColumn(int atom2, Vector3d fg){
1112	+	#ifdef IS_MPI
1113	+	atomColData.force[atom2] += fg;
1114	+	#else
1115	+	snap_->atomData.force[atom2] += fg;
1116	+	#endif
1117	+	}
1118	+
1119	+	// filling interaction blocks with pointers
1120	+	void ForceMatrixDecomposition::fillInteractionData(InteractionData &idat,
1121	+	int atom1, int atom2) {
1122	+
1123	+	idat.excluded = excludeAtomPair(atom1, atom2);
1124	+
1125	+	#ifdef IS_MPI
1126	+	idat.atypes = make_pair( atypesRow[atom1], atypesCol[atom2]);
1127	+	//idat.atypes = make_pair( ff_->getAtomType(identsRow[atom1]),
1128	+	//                         ff_->getAtomType(identsCol[atom2]) );
1129	+
1130	+	if (storageLayout_ & DataStorage::dslAmat) {
1131	+	idat.A1 = &(atomRowData.aMat[atom1]);
1132	+	idat.A2 = &(atomColData.aMat[atom2]);
1133	+	}
1134	+
1135	+	if (storageLayout_ & DataStorage::dslElectroFrame) {
1136	+	idat.eFrame1 = &(atomRowData.electroFrame[atom1]);
1137	+	idat.eFrame2 = &(atomColData.electroFrame[atom2]);
1138	+	}
1139	+
1140	+	if (storageLayout_ & DataStorage::dslTorque) {
1141	+	idat.t1 = &(atomRowData.torque[atom1]);
1142	+	idat.t2 = &(atomColData.torque[atom2]);
1143	+	}
1144	+
1145	+	if (storageLayout_ & DataStorage::dslDensity) {
1146	+	idat.rho1 = &(atomRowData.density[atom1]);
1147	+	idat.rho2 = &(atomColData.density[atom2]);
1148	+	}
1149	+
1150	+	if (storageLayout_ & DataStorage::dslFunctional) {
1151	+	idat.frho1 = &(atomRowData.functional[atom1]);
1152	+	idat.frho2 = &(atomColData.functional[atom2]);
1153		}
1154	+
1155	+	if (storageLayout_ & DataStorage::dslFunctionalDerivative) {
1156	+	idat.dfrho1 = &(atomRowData.functionalDerivative[atom1]);
1157	+	idat.dfrho2 = &(atomColData.functionalDerivative[atom2]);
1158	+	}
1159	+
1160	+	if (storageLayout_ & DataStorage::dslParticlePot) {
1161	+	idat.particlePot1 = &(atomRowData.particlePot[atom1]);
1162	+	idat.particlePot2 = &(atomColData.particlePot[atom2]);
1163	+	}
1164	+
1165	+	if (storageLayout_ & DataStorage::dslSkippedCharge) {
1166	+	idat.skippedCharge1 = &(atomRowData.skippedCharge[atom1]);
1167	+	idat.skippedCharge2 = &(atomColData.skippedCharge[atom2]);
1168	+	}
1169	+
1170	+	if (storageLayout_ & DataStorage::dslFlucQPosition) {
1171	+	idat.flucQ1 = &(atomRowData.flucQPos[atom1]);
1172	+	idat.flucQ2 = &(atomColData.flucQPos[atom2]);
1173	+	}
1174	+
1175	+	#else
1176	+
1177	+	idat.atypes = make_pair( atypesLocal[atom1], atypesLocal[atom2]);
1178	+
1179	+	if (storageLayout_ & DataStorage::dslAmat) {
1180	+	idat.A1 = &(snap_->atomData.aMat[atom1]);
1181	+	idat.A2 = &(snap_->atomData.aMat[atom2]);
1182	+	}
1183	+
1184	+	if (storageLayout_ & DataStorage::dslElectroFrame) {
1185	+	idat.eFrame1 = &(snap_->atomData.electroFrame[atom1]);
1186	+	idat.eFrame2 = &(snap_->atomData.electroFrame[atom2]);
1187	+	}
1188	+
1189	+	if (storageLayout_ & DataStorage::dslTorque) {
1190	+	idat.t1 = &(snap_->atomData.torque[atom1]);
1191	+	idat.t2 = &(snap_->atomData.torque[atom2]);
1192	+	}
1193	+
1194	+	if (storageLayout_ & DataStorage::dslDensity) {
1195	+	idat.rho1 = &(snap_->atomData.density[atom1]);
1196	+	idat.rho2 = &(snap_->atomData.density[atom2]);
1197	+	}
1198	+
1199	+	if (storageLayout_ & DataStorage::dslFunctional) {
1200	+	idat.frho1 = &(snap_->atomData.functional[atom1]);
1201	+	idat.frho2 = &(snap_->atomData.functional[atom2]);
1202	+	}
1203	+
1204	+	if (storageLayout_ & DataStorage::dslFunctionalDerivative) {
1205	+	idat.dfrho1 = &(snap_->atomData.functionalDerivative[atom1]);
1206	+	idat.dfrho2 = &(snap_->atomData.functionalDerivative[atom2]);
1207	+	}
1208	+
1209	+	if (storageLayout_ & DataStorage::dslParticlePot) {
1210	+	idat.particlePot1 = &(snap_->atomData.particlePot[atom1]);
1211	+	idat.particlePot2 = &(snap_->atomData.particlePot[atom2]);
1212	+	}
1213	+
1214	+	if (storageLayout_ & DataStorage::dslSkippedCharge) {
1215	+	idat.skippedCharge1 = &(snap_->atomData.skippedCharge[atom1]);
1216	+	idat.skippedCharge2 = &(snap_->atomData.skippedCharge[atom2]);
1217	+	}
1218	+
1219	+	if (storageLayout_ & DataStorage::dslFlucQPosition) {
1220	+	idat.flucQ1 = &(snap_->atomData.flucQPos[atom1]);
1221	+	idat.flucQ2 = &(snap_->atomData.flucQPos[atom2]);
1222	+	}
1223	+
1224		#endif
1225		}
1226	+
1227
1228	+	void ForceMatrixDecomposition::unpackInteractionData(InteractionData &idat, int atom1, int atom2) {
1229	+	#ifdef IS_MPI
1230	+	pot_row[atom1] += RealType(0.5) *  *(idat.pot);
1231	+	pot_col[atom2] += RealType(0.5) *  *(idat.pot);
1232	+	expot_row[atom1] += RealType(0.5) *  *(idat.excludedPot);
1233	+	expot_col[atom2] += RealType(0.5) *  *(idat.excludedPot);
1234	+
1235	+	atomRowData.force[atom1] += *(idat.f1);
1236	+	atomColData.force[atom2] -= *(idat.f1);
1237	+
1238	+	if (storageLayout_ & DataStorage::dslFlucQForce) {
1239	+	atomRowData.flucQFrc[atom1] -= *(idat.dVdFQ1);
1240	+	atomColData.flucQFrc[atom2] -= *(idat.dVdFQ2);
1241	+	}
1242	+
1243	+	if (storageLayout_ & DataStorage::dslElectricField) {
1244	+	atomRowData.electricField[atom1] += *(idat.eField1);
1245	+	atomColData.electricField[atom2] += *(idat.eField2);
1246	+	}
1247	+
1248	+	#else
1249	+	pairwisePot += *(idat.pot);
1250	+	excludedPot += *(idat.excludedPot);
1251	+
1252	+	snap_->atomData.force[atom1] += *(idat.f1);
1253	+	snap_->atomData.force[atom2] -= *(idat.f1);
1254	+
1255	+	if (idat.doParticlePot) {
1256	+	// This is the pairwise contribution to the particle pot.  The
1257	+	// embedding contribution is added in each of the low level
1258	+	// non-bonded routines.  In parallel, this calculation is done
1259	+	// in collectData, not in unpackInteractionData.
1260	+	snap_->atomData.particlePot[atom1] += *(idat.vpair) * *(idat.sw);
1261	+	snap_->atomData.particlePot[atom2] += *(idat.vpair) * *(idat.sw);
1262	+	}
1263	+
1264	+	if (storageLayout_ & DataStorage::dslFlucQForce) {
1265	+	snap_->atomData.flucQFrc[atom1] -= *(idat.dVdFQ1);
1266	+	snap_->atomData.flucQFrc[atom2] -= *(idat.dVdFQ2);
1267	+	}
1268	+
1269	+	if (storageLayout_ & DataStorage::dslElectricField) {
1270	+	snap_->atomData.electricField[atom1] += *(idat.eField1);
1271	+	snap_->atomData.electricField[atom2] += *(idat.eField2);
1272	+	}
1273	+
1274	+	#endif
1275	+
1276	+	}
1277	+
1278	+	/*
1279	+	* buildNeighborList
1280	+	*
1281	+	* first element of pair is row-indexed CutoffGroup
1282	+	* second element of pair is column-indexed CutoffGroup
1283	+	*/
1284	+	vector<pair<int, int> > ForceMatrixDecomposition::buildNeighborList() {
1285	+
1286	+	vector<pair<int, int> > neighborList;
1287	+	groupCutoffs cuts;
1288	+	bool doAllPairs = false;
1289	+
1290	+	#ifdef IS_MPI
1291	+	cellListRow_.clear();
1292	+	cellListCol_.clear();
1293	+	#else
1294	+	cellList_.clear();
1295	+	#endif
1296	+
1297	+	RealType rList_ = (largestRcut_ + skinThickness_);
1298	+	Snapshot* snap_ = sman_->getCurrentSnapshot();
1299	+	Mat3x3d Hmat = snap_->getHmat();
1300	+	Vector3d Hx = Hmat.getColumn(0);
1301	+	Vector3d Hy = Hmat.getColumn(1);
1302	+	Vector3d Hz = Hmat.getColumn(2);
1303	+
1304	+	nCells_.x() = (int) ( Hx.length() )/ rList_;
1305	+	nCells_.y() = (int) ( Hy.length() )/ rList_;
1306	+	nCells_.z() = (int) ( Hz.length() )/ rList_;
1307	+
1308	+	// handle small boxes where the cell offsets can end up repeating cells
1309	+
1310	+	if (nCells_.x() < 3) doAllPairs = true;
1311	+	if (nCells_.y() < 3) doAllPairs = true;
1312	+	if (nCells_.z() < 3) doAllPairs = true;
1313	+
1314	+	Mat3x3d invHmat = snap_->getInvHmat();
1315	+	Vector3d rs, scaled, dr;
1316	+	Vector3i whichCell;
1317	+	int cellIndex;
1318	+	int nCtot = nCells_.x() * nCells_.y() * nCells_.z();
1319	+
1320	+	#ifdef IS_MPI
1321	+	cellListRow_.resize(nCtot);
1322	+	cellListCol_.resize(nCtot);
1323	+	#else
1324	+	cellList_.resize(nCtot);
1325	+	#endif
1326	+
1327	+	if (!doAllPairs) {
1328	+	#ifdef IS_MPI
1329	+
1330	+	for (int i = 0; i < nGroupsInRow_; i++) {
1331	+	rs = cgRowData.position[i];
1332	+
1333	+	// scaled positions relative to the box vectors
1334	+	scaled = invHmat * rs;
1335	+
1336	+	// wrap the vector back into the unit box by subtracting integer box
1337	+	// numbers
1338	+	for (int j = 0; j < 3; j++) {
1339	+	scaled[j] -= roundMe(scaled[j]);
1340	+	scaled[j] += 0.5;
1341	+	// Handle the special case when an object is exactly on the
1342	+	// boundary (a scaled coordinate of 1.0 is the same as
1343	+	// scaled coordinate of 0.0)
1344	+	if (scaled[j] >= 1.0) scaled[j] -= 1.0;
1345	+	}
1346	+
1347	+	// find xyz-indices of cell that cutoffGroup is in.
1348	+	whichCell.x() = nCells_.x() * scaled.x();
1349	+	whichCell.y() = nCells_.y() * scaled.y();
1350	+	whichCell.z() = nCells_.z() * scaled.z();
1351	+
1352	+	// find single index of this cell:
1353	+	cellIndex = Vlinear(whichCell, nCells_);
1354	+
1355	+	// add this cutoff group to the list of groups in this cell;
1356	+	cellListRow_[cellIndex].push_back(i);
1357	+	}
1358	+	for (int i = 0; i < nGroupsInCol_; i++) {
1359	+	rs = cgColData.position[i];
1360	+
1361	+	// scaled positions relative to the box vectors
1362	+	scaled = invHmat * rs;
1363	+
1364	+	// wrap the vector back into the unit box by subtracting integer box
1365	+	// numbers
1366	+	for (int j = 0; j < 3; j++) {
1367	+	scaled[j] -= roundMe(scaled[j]);
1368	+	scaled[j] += 0.5;
1369	+	// Handle the special case when an object is exactly on the
1370	+	// boundary (a scaled coordinate of 1.0 is the same as
1371	+	// scaled coordinate of 0.0)
1372	+	if (scaled[j] >= 1.0) scaled[j] -= 1.0;
1373	+	}
1374	+
1375	+	// find xyz-indices of cell that cutoffGroup is in.
1376	+	whichCell.x() = nCells_.x() * scaled.x();
1377	+	whichCell.y() = nCells_.y() * scaled.y();
1378	+	whichCell.z() = nCells_.z() * scaled.z();
1379	+
1380	+	// find single index of this cell:
1381	+	cellIndex = Vlinear(whichCell, nCells_);
1382	+
1383	+	// add this cutoff group to the list of groups in this cell;
1384	+	cellListCol_[cellIndex].push_back(i);
1385	+	}
1386	+
1387	+	#else
1388	+	for (int i = 0; i < nGroups_; i++) {
1389	+	rs = snap_->cgData.position[i];
1390	+
1391	+	// scaled positions relative to the box vectors
1392	+	scaled = invHmat * rs;
1393	+
1394	+	// wrap the vector back into the unit box by subtracting integer box
1395	+	// numbers
1396	+	for (int j = 0; j < 3; j++) {
1397	+	scaled[j] -= roundMe(scaled[j]);
1398	+	scaled[j] += 0.5;
1399	+	// Handle the special case when an object is exactly on the
1400	+	// boundary (a scaled coordinate of 1.0 is the same as
1401	+	// scaled coordinate of 0.0)
1402	+	if (scaled[j] >= 1.0) scaled[j] -= 1.0;
1403	+	}
1404	+
1405	+	// find xyz-indices of cell that cutoffGroup is in.
1406	+	whichCell.x() = nCells_.x() * scaled.x();
1407	+	whichCell.y() = nCells_.y() * scaled.y();
1408	+	whichCell.z() = nCells_.z() * scaled.z();
1409	+
1410	+	// find single index of this cell:
1411	+	cellIndex = Vlinear(whichCell, nCells_);
1412	+
1413	+	// add this cutoff group to the list of groups in this cell;
1414	+	cellList_[cellIndex].push_back(i);
1415	+	}
1416	+
1417	+	#endif
1418	+
1419	+	for (int m1z = 0; m1z < nCells_.z(); m1z++) {
1420	+	for (int m1y = 0; m1y < nCells_.y(); m1y++) {
1421	+	for (int m1x = 0; m1x < nCells_.x(); m1x++) {
1422	+	Vector3i m1v(m1x, m1y, m1z);
1423	+	int m1 = Vlinear(m1v, nCells_);
1424	+
1425	+	for (vector<Vector3i>::iterator os = cellOffsets_.begin();
1426	+	os != cellOffsets_.end(); ++os) {
1427	+
1428	+	Vector3i m2v = m1v + (*os);
1429	+
1430	+
1431	+	if (m2v.x() >= nCells_.x()) {
1432	+	m2v.x() = 0;
1433	+	} else if (m2v.x() < 0) {
1434	+	m2v.x() = nCells_.x() - 1;
1435	+	}
1436	+
1437	+	if (m2v.y() >= nCells_.y()) {
1438	+	m2v.y() = 0;
1439	+	} else if (m2v.y() < 0) {
1440	+	m2v.y() = nCells_.y() - 1;
1441	+	}
1442	+
1443	+	if (m2v.z() >= nCells_.z()) {
1444	+	m2v.z() = 0;
1445	+	} else if (m2v.z() < 0) {
1446	+	m2v.z() = nCells_.z() - 1;
1447	+	}
1448	+
1449	+	int m2 = Vlinear (m2v, nCells_);
1450	+
1451	+	#ifdef IS_MPI
1452	+	for (vector<int>::iterator j1 = cellListRow_[m1].begin();
1453	+	j1 != cellListRow_[m1].end(); ++j1) {
1454	+	for (vector<int>::iterator j2 = cellListCol_[m2].begin();
1455	+	j2 != cellListCol_[m2].end(); ++j2) {
1456	+
1457	+	// In parallel, we need to visit *all* pairs of row
1458	+	// & column indicies and will divide labor in the
1459	+	// force evaluation later.
1460	+	dr = cgColData.position[(*j2)] - cgRowData.position[(*j1)];
1461	+	snap_->wrapVector(dr);
1462	+	cuts = getGroupCutoffs( (*j1), (*j2) );
1463	+	if (dr.lengthSquare() < cuts.third) {
1464	+	neighborList.push_back(make_pair((*j1), (*j2)));
1465	+	}
1466	+	}
1467	+	}
1468	+	#else
1469	+	for (vector<int>::iterator j1 = cellList_[m1].begin();
1470	+	j1 != cellList_[m1].end(); ++j1) {
1471	+	for (vector<int>::iterator j2 = cellList_[m2].begin();
1472	+	j2 != cellList_[m2].end(); ++j2) {
1473	+
1474	+	// Always do this if we're in different cells or if
1475	+	// we're in the same cell and the global index of
1476	+	// the j2 cutoff group is greater than or equal to
1477	+	// the j1 cutoff group.  Note that Rappaport's code
1478	+	// has a "less than" conditional here, but that
1479	+	// deals with atom-by-atom computation.  OpenMD
1480	+	// allows atoms within a single cutoff group to
1481	+	// interact with each other.
1482	+
1483	+
1484	+
1485	+	if (m2 != m1 || (*j2) >= (*j1) ) {
1486	+
1487	+	dr = snap_->cgData.position[(*j2)] - snap_->cgData.position[(*j1)];
1488	+	snap_->wrapVector(dr);
1489	+	cuts = getGroupCutoffs( (*j1), (*j2) );
1490	+	if (dr.lengthSquare() < cuts.third) {
1491	+	neighborList.push_back(make_pair((*j1), (*j2)));
1492	+	}
1493	+	}
1494	+	}
1495	+	}
1496	+	#endif
1497	+	}
1498	+	}
1499	+	}
1500	+	}
1501	+	} else {
1502	+	// branch to do all cutoff group pairs
1503	+	#ifdef IS_MPI
1504	+	for (int j1 = 0; j1 < nGroupsInRow_; j1++) {
1505	+	for (int j2 = 0; j2 < nGroupsInCol_; j2++) {
1506	+	dr = cgColData.position[j2] - cgRowData.position[j1];
1507	+	snap_->wrapVector(dr);
1508	+	cuts = getGroupCutoffs( j1, j2 );
1509	+	if (dr.lengthSquare() < cuts.third) {
1510	+	neighborList.push_back(make_pair(j1, j2));
1511	+	}
1512	+	}
1513	+	}
1514	+	#else
1515	+	// include all groups here.
1516	+	for (int j1 = 0; j1 < nGroups_; j1++) {
1517	+	// include self group interactions j2 == j1
1518	+	for (int j2 = j1; j2 < nGroups_; j2++) {
1519	+	dr = snap_->cgData.position[j2] - snap_->cgData.position[j1];
1520	+	snap_->wrapVector(dr);
1521	+	cuts = getGroupCutoffs( j1, j2 );
1522	+	if (dr.lengthSquare() < cuts.third) {
1523	+	neighborList.push_back(make_pair(j1, j2));
1524	+	}
1525	+	}
1526	+	}
1527	+	#endif
1528	+	}
1529	+
1530	+	// save the local cutoff group positions for the check that is
1531	+	// done on each loop:
1532	+	saved_CG_positions_.clear();
1533	+	for (int i = 0; i < nGroups_; i++)
1534	+	saved_CG_positions_.push_back(snap_->cgData.position[i]);
1535	+
1536	+	return neighborList;
1537	+	}
1538		} //end namespace OpenMD

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