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

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branches/development/src/parallel/ForceMatrixDecomposition.cpp (file contents), Revision 1549 by gezelter, Wed Apr 27 18:38:15 2011 UTC vs.
trunk/src/parallel/ForceMatrixDecomposition.cpp (file contents), Revision 1969 by gezelter, Wed Feb 26 14:14:50 2014 UTC

#	Line 35 | 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	+	// 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		*/
53	–
93		void ForceMatrixDecomposition::distributeInitialData() {
94	<	#ifdef IS_MPI
95	<	Snapshot* snap = sman_->getCurrentSnapshot();
96	<	int nLocal = snap->getNumberOfAtoms();
97	<	int nGroups = snap->getNumberOfCutoffGroups();
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	>	regions = info_->getRegions();
103	>	AtomLocalToGlobal = info_->getGlobalAtomIndices();
104	>	cgLocalToGlobal = info_->getGlobalGroupIndices();
105	>	vector<int> globalGroupMembership = info_->getGlobalGroupMembership();
106
107	<	AtomCommIntRow = new Communicator<Row,int>(nLocal);
61	<	AtomCommRealRow = new Communicator<Row,RealType>(nLocal);
62	<	AtomCommVectorRow = new Communicator<Row,Vector3d>(nLocal);
63	<	AtomCommMatrixRow = new Communicator<Row,Mat3x3d>(nLocal);
107	>	massFactors = info_->getMassFactors();
108
109	<	AtomCommIntColumn = new Communicator<Column,int>(nLocal);
110	<	AtomCommRealColumn = new Communicator<Column,RealType>(nLocal);
111	<	AtomCommVectorColumn = new Communicator<Column,Vector3d>(nLocal);
112	<	AtomCommMatrixColumn = new Communicator<Column,Mat3x3d>(nLocal);
109	>	PairList* excludes = info_->getExcludedInteractions();
110	>	PairList* oneTwo = info_->getOneTwoInteractions();
111	>	PairList* oneThree = info_->getOneThreeInteractions();
112	>	PairList* oneFour = info_->getOneFourInteractions();
113	>
114	>	if (needVelocities_)
115	>	snap_->cgData.setStorageLayout(DataStorage::dslPosition |
116	>	DataStorage::dslVelocity);
117	>	else
118	>	snap_->cgData.setStorageLayout(DataStorage::dslPosition);
119	>
120	>	#ifdef IS_MPI
121	>
122	>	MPI_Comm row = rowComm.getComm();
123	>	MPI_Comm col = colComm.getComm();
124
125	<	cgCommIntRow = new Communicator<Row,int>(nGroups);
126	<	cgCommVectorRow = new Communicator<Row,Vector3d>(nGroups);
127	<	cgCommIntColumn = new Communicator<Column,int>(nGroups);
128	<	cgCommVectorColumn = new Communicator<Column,Vector3d>(nGroups);
125	>	AtomPlanIntRow = new Plan<int>(row, nLocal_);
126	>	AtomPlanRealRow = new Plan<RealType>(row, nLocal_);
127	>	AtomPlanVectorRow = new Plan<Vector3d>(row, nLocal_);
128	>	AtomPlanMatrixRow = new Plan<Mat3x3d>(row, nLocal_);
129	>	AtomPlanPotRow = new Plan<potVec>(row, nLocal_);
130
131	<	int nAtomsInRow = AtomCommIntRow->getSize();
132	<	int nAtomsInCol = AtomCommIntColumn->getSize();
133	<	int nGroupsInRow = cgCommIntRow->getSize();
134	<	int nGroupsInCol = cgCommIntColumn->getSize();
131	>	AtomPlanIntColumn = new Plan<int>(col, nLocal_);
132	>	AtomPlanRealColumn = new Plan<RealType>(col, nLocal_);
133	>	AtomPlanVectorColumn = new Plan<Vector3d>(col, nLocal_);
134	>	AtomPlanMatrixColumn = new Plan<Mat3x3d>(col, nLocal_);
135	>	AtomPlanPotColumn = new Plan<potVec>(col, nLocal_);
136	>
137	>	cgPlanIntRow = new Plan<int>(row, nGroups_);
138	>	cgPlanVectorRow = new Plan<Vector3d>(row, nGroups_);
139	>	cgPlanIntColumn = new Plan<int>(col, nGroups_);
140	>	cgPlanVectorColumn = new Plan<Vector3d>(col, nGroups_);
141	>
142	>	nAtomsInRow_ = AtomPlanIntRow->getSize();
143	>	nAtomsInCol_ = AtomPlanIntColumn->getSize();
144	>	nGroupsInRow_ = cgPlanIntRow->getSize();
145	>	nGroupsInCol_ = cgPlanIntColumn->getSize();
146	>
147	>	// Modify the data storage objects with the correct layouts and sizes:
148	>	atomRowData.resize(nAtomsInRow_);
149	>	atomRowData.setStorageLayout(storageLayout_);
150	>	atomColData.resize(nAtomsInCol_);
151	>	atomColData.setStorageLayout(storageLayout_);
152	>	cgRowData.resize(nGroupsInRow_);
153	>	cgRowData.setStorageLayout(DataStorage::dslPosition);
154	>	cgColData.resize(nGroupsInCol_);
155	>	if (needVelocities_)
156	>	// we only need column velocities if we need them.
157	>	cgColData.setStorageLayout(DataStorage::dslPosition |
158	>	DataStorage::dslVelocity);
159	>	else
160	>	cgColData.setStorageLayout(DataStorage::dslPosition);
161	>
162	>	identsRow.resize(nAtomsInRow_);
163	>	identsCol.resize(nAtomsInCol_);
164
165	<	vector<vector<RealType> > pot_row(N_INTERACTION_FAMILIES,
166	<	vector<RealType> (nAtomsInRow, 0.0));
167	<	vector<vector<RealType> > pot_col(N_INTERACTION_FAMILIES,
168	<	vector<RealType> (nAtomsInCol, 0.0));
165	>	AtomPlanIntRow->gather(idents, identsRow);
166	>	AtomPlanIntColumn->gather(idents, identsCol);
167	>
168	>	regionsRow.resize(nAtomsInRow_);
169	>	regionsCol.resize(nAtomsInCol_);
170
171	<	vector<RealType> pot_local(N_INTERACTION_FAMILIES, 0.0);
171	>	AtomPlanIntRow->gather(regions, regionsRow);
172	>	AtomPlanIntColumn->gather(regions, regionsCol);
173
174	<	// gather the information for atomtype IDs (atids):
175	<	vector<int> identsLocal = info_->getIdentArray();
176	<	identsRow.reserve(nAtomsInRow);
90	<	identsCol.reserve(nAtomsInCol);
91	<
92	<	AtomCommIntRow->gather(identsLocal, identsRow);
93	<	AtomCommIntColumn->gather(identsLocal, identsCol);
94	<
95	<	AtomLocalToGlobal = info_->getGlobalAtomIndices();
96	<	AtomCommIntRow->gather(AtomLocalToGlobal, AtomRowToGlobal);
97	<	AtomCommIntColumn->gather(AtomLocalToGlobal, AtomColToGlobal);
98	<
99	<	cgLocalToGlobal = info_->getGlobalGroupIndices();
100	<	cgCommIntRow->gather(cgLocalToGlobal, cgRowToGlobal);
101	<	cgCommIntColumn->gather(cgLocalToGlobal, cgColToGlobal);
174	>	// allocate memory for the parallel objects
175	>	atypesRow.resize(nAtomsInRow_);
176	>	atypesCol.resize(nAtomsInCol_);
177
178	<	// still need:
179	<	// topoDist
180	<	// exclude
178	>	for (int i = 0; i < nAtomsInRow_; i++)
179	>	atypesRow[i] = ff_->getAtomType(identsRow[i]);
180	>	for (int i = 0; i < nAtomsInCol_; i++)
181	>	atypesCol[i] = ff_->getAtomType(identsCol[i]);
182	>
183	>	pot_row.resize(nAtomsInRow_);
184	>	pot_col.resize(nAtomsInCol_);
185	>
186	>	expot_row.resize(nAtomsInRow_);
187	>	expot_col.resize(nAtomsInCol_);
188	>
189	>	AtomRowToGlobal.resize(nAtomsInRow_);
190	>	AtomColToGlobal.resize(nAtomsInCol_);
191	>	AtomPlanIntRow->gather(AtomLocalToGlobal, AtomRowToGlobal);
192	>	AtomPlanIntColumn->gather(AtomLocalToGlobal, AtomColToGlobal);
193	>
194	>	cgRowToGlobal.resize(nGroupsInRow_);
195	>	cgColToGlobal.resize(nGroupsInCol_);
196	>	cgPlanIntRow->gather(cgLocalToGlobal, cgRowToGlobal);
197	>	cgPlanIntColumn->gather(cgLocalToGlobal, cgColToGlobal);
198	>
199	>	massFactorsRow.resize(nAtomsInRow_);
200	>	massFactorsCol.resize(nAtomsInCol_);
201	>	AtomPlanRealRow->gather(massFactors, massFactorsRow);
202	>	AtomPlanRealColumn->gather(massFactors, massFactorsCol);
203	>
204	>	groupListRow_.clear();
205	>	groupListRow_.resize(nGroupsInRow_);
206	>	for (int i = 0; i < nGroupsInRow_; i++) {
207	>	int gid = cgRowToGlobal[i];
208	>	for (int j = 0; j < nAtomsInRow_; j++) {
209	>	int aid = AtomRowToGlobal[j];
210	>	if (globalGroupMembership[aid] == gid)
211	>	groupListRow_[i].push_back(j);
212	>	}
213	>	}
214	>
215	>	groupListCol_.clear();
216	>	groupListCol_.resize(nGroupsInCol_);
217	>	for (int i = 0; i < nGroupsInCol_; i++) {
218	>	int gid = cgColToGlobal[i];
219	>	for (int j = 0; j < nAtomsInCol_; j++) {
220	>	int aid = AtomColToGlobal[j];
221	>	if (globalGroupMembership[aid] == gid)
222	>	groupListCol_[i].push_back(j);
223	>	}
224	>	}
225	>
226	>	excludesForAtom.clear();
227	>	excludesForAtom.resize(nAtomsInRow_);
228	>	toposForAtom.clear();
229	>	toposForAtom.resize(nAtomsInRow_);
230	>	topoDist.clear();
231	>	topoDist.resize(nAtomsInRow_);
232	>	for (int i = 0; i < nAtomsInRow_; i++) {
233	>	int iglob = AtomRowToGlobal[i];
234	>
235	>	for (int j = 0; j < nAtomsInCol_; j++) {
236	>	int jglob = AtomColToGlobal[j];
237	>
238	>	if (excludes->hasPair(iglob, jglob))
239	>	excludesForAtom[i].push_back(j);
240	>
241	>	if (oneTwo->hasPair(iglob, jglob)) {
242	>	toposForAtom[i].push_back(j);
243	>	topoDist[i].push_back(1);
244	>	} else {
245	>	if (oneThree->hasPair(iglob, jglob)) {
246	>	toposForAtom[i].push_back(j);
247	>	topoDist[i].push_back(2);
248	>	} else {
249	>	if (oneFour->hasPair(iglob, jglob)) {
250	>	toposForAtom[i].push_back(j);
251	>	topoDist[i].push_back(3);
252	>	}
253	>	}
254	>	}
255	>	}
256	>	}
257	>
258	>	#else
259	>	excludesForAtom.clear();
260	>	excludesForAtom.resize(nLocal_);
261	>	toposForAtom.clear();
262	>	toposForAtom.resize(nLocal_);
263	>	topoDist.clear();
264	>	topoDist.resize(nLocal_);
265	>
266	>	for (int i = 0; i < nLocal_; i++) {
267	>	int iglob = AtomLocalToGlobal[i];
268	>
269	>	for (int j = 0; j < nLocal_; j++) {
270	>	int jglob = AtomLocalToGlobal[j];
271	>
272	>	if (excludes->hasPair(iglob, jglob))
273	>	excludesForAtom[i].push_back(j);
274	>
275	>	if (oneTwo->hasPair(iglob, jglob)) {
276	>	toposForAtom[i].push_back(j);
277	>	topoDist[i].push_back(1);
278	>	} else {
279	>	if (oneThree->hasPair(iglob, jglob)) {
280	>	toposForAtom[i].push_back(j);
281	>	topoDist[i].push_back(2);
282	>	} else {
283	>	if (oneFour->hasPair(iglob, jglob)) {
284	>	toposForAtom[i].push_back(j);
285	>	topoDist[i].push_back(3);
286	>	}
287	>	}
288	>	}
289	>	}
290	>	}
291		#endif
292	+
293	+	// allocate memory for the parallel objects
294	+	atypesLocal.resize(nLocal_);
295	+
296	+	for (int i = 0; i < nLocal_; i++)
297	+	atypesLocal[i] = ff_->getAtomType(idents[i]);
298	+
299	+	groupList_.clear();
300	+	groupList_.resize(nGroups_);
301	+	for (int i = 0; i < nGroups_; i++) {
302	+	int gid = cgLocalToGlobal[i];
303	+	for (int j = 0; j < nLocal_; j++) {
304	+	int aid = AtomLocalToGlobal[j];
305	+	if (globalGroupMembership[aid] == gid) {
306	+	groupList_[i].push_back(j);
307	+	}
308	+	}
309	+	}
310	+
311	+
312	+	createGtypeCutoffMap();
313	+
314	+	}
315	+
316	+	void ForceMatrixDecomposition::createGtypeCutoffMap() {
317	+
318	+	GrCut.clear();
319	+	GrCutSq.clear();
320	+	GrlistSq.clear();
321	+
322	+	RealType tol = 1e-6;
323	+	largestRcut_ = 0.0;
324	+	int atid;
325	+	set<AtomType*> atypes = info_->getSimulatedAtomTypes();
326	+
327	+	map<int, RealType> atypeCutoff;
328	+
329	+	for (set<AtomType*>::iterator at = atypes.begin();
330	+	at != atypes.end(); ++at){
331	+	atid = (*at)->getIdent();
332	+	if (userChoseCutoff_)
333	+	atypeCutoff[atid] = userCutoff_;
334	+	else
335	+	atypeCutoff[atid] = interactionMan_->getSuggestedCutoffRadius(*at);
336	+	}
337	+
338	+	vector<RealType> gTypeCutoffs;
339	+	// first we do a single loop over the cutoff groups to find the
340	+	// largest cutoff for any atypes present in this group.
341	+	#ifdef IS_MPI
342	+	vector<RealType> groupCutoffRow(nGroupsInRow_, 0.0);
343	+	groupRowToGtype.resize(nGroupsInRow_);
344	+	for (int cg1 = 0; cg1 < nGroupsInRow_; cg1++) {
345	+	vector<int> atomListRow = getAtomsInGroupRow(cg1);
346	+	for (vector<int>::iterator ia = atomListRow.begin();
347	+	ia != atomListRow.end(); ++ia) {
348	+	int atom1 = (*ia);
349	+	atid = identsRow[atom1];
350	+	if (atypeCutoff[atid] > groupCutoffRow[cg1]) {
351	+	groupCutoffRow[cg1] = atypeCutoff[atid];
352	+	}
353	+	}
354	+
355	+	bool gTypeFound = false;
356	+	for (int gt = 0; gt < gTypeCutoffs.size(); gt++) {
357	+	if (abs(groupCutoffRow[cg1] - gTypeCutoffs[gt]) < tol) {
358	+	groupRowToGtype[cg1] = gt;
359	+	gTypeFound = true;
360	+	}
361	+	}
362	+	if (!gTypeFound) {
363	+	gTypeCutoffs.push_back( groupCutoffRow[cg1] );
364	+	groupRowToGtype[cg1] = gTypeCutoffs.size() - 1;
365	+	}
366	+
367	+	}
368	+	vector<RealType> groupCutoffCol(nGroupsInCol_, 0.0);
369	+	groupColToGtype.resize(nGroupsInCol_);
370	+	for (int cg2 = 0; cg2 < nGroupsInCol_; cg2++) {
371	+	vector<int> atomListCol = getAtomsInGroupColumn(cg2);
372	+	for (vector<int>::iterator jb = atomListCol.begin();
373	+	jb != atomListCol.end(); ++jb) {
374	+	int atom2 = (*jb);
375	+	atid = identsCol[atom2];
376	+	if (atypeCutoff[atid] > groupCutoffCol[cg2]) {
377	+	groupCutoffCol[cg2] = atypeCutoff[atid];
378	+	}
379	+	}
380	+	bool gTypeFound = false;
381	+	for (int gt = 0; gt < gTypeCutoffs.size(); gt++) {
382	+	if (abs(groupCutoffCol[cg2] - gTypeCutoffs[gt]) < tol) {
383	+	groupColToGtype[cg2] = gt;
384	+	gTypeFound = true;
385	+	}
386	+	}
387	+	if (!gTypeFound) {
388	+	gTypeCutoffs.push_back( groupCutoffCol[cg2] );
389	+	groupColToGtype[cg2] = gTypeCutoffs.size() - 1;
390	+	}
391	+	}
392	+	#else
393	+
394	+	vector<RealType> groupCutoff(nGroups_, 0.0);
395	+	groupToGtype.resize(nGroups_);
396	+	for (int cg1 = 0; cg1 < nGroups_; cg1++) {
397	+	groupCutoff[cg1] = 0.0;
398	+	vector<int> atomList = getAtomsInGroupRow(cg1);
399	+	for (vector<int>::iterator ia = atomList.begin();
400	+	ia != atomList.end(); ++ia) {
401	+	int atom1 = (*ia);
402	+	atid = idents[atom1];
403	+	if (atypeCutoff[atid] > groupCutoff[cg1])
404	+	groupCutoff[cg1] = atypeCutoff[atid];
405	+	}
406	+
407	+	bool gTypeFound = false;
408	+	for (unsigned int gt = 0; gt < gTypeCutoffs.size(); gt++) {
409	+	if (abs(groupCutoff[cg1] - gTypeCutoffs[gt]) < tol) {
410	+	groupToGtype[cg1] = gt;
411	+	gTypeFound = true;
412	+	}
413	+	}
414	+	if (!gTypeFound) {
415	+	gTypeCutoffs.push_back( groupCutoff[cg1] );
416	+	groupToGtype[cg1] = gTypeCutoffs.size() - 1;
417	+	}
418	+	}
419	+	#endif
420	+
421	+	// Now we find the maximum group cutoff value present in the simulation
422	+
423	+	RealType groupMax = *max_element(gTypeCutoffs.begin(),
424	+	gTypeCutoffs.end());
425	+
426	+	#ifdef IS_MPI
427	+	MPI_Allreduce(&groupMax, &groupMax, 1, MPI_REALTYPE,
428	+	MPI_MAX, MPI_COMM_WORLD);
429	+	#endif
430	+
431	+	RealType tradRcut = groupMax;
432	+
433	+	GrCut.resize( gTypeCutoffs.size() );
434	+	GrCutSq.resize( gTypeCutoffs.size() );
435	+	GrlistSq.resize( gTypeCutoffs.size() );
436	+
437	+
438	+	for (unsigned int i = 0; i < gTypeCutoffs.size();  i++) {
439	+	GrCut[i].resize( gTypeCutoffs.size() , 0.0);
440	+	GrCutSq[i].resize( gTypeCutoffs.size(), 0.0 );
441	+	GrlistSq[i].resize( gTypeCutoffs.size(), 0.0 );
442	+
443	+	for (unsigned int j = 0; j < gTypeCutoffs.size();  j++) {
444	+	RealType thisRcut;
445	+	switch(cutoffPolicy_) {
446	+	case TRADITIONAL:
447	+	thisRcut = tradRcut;
448	+	break;
449	+	case MIX:
450	+	thisRcut = 0.5 * (gTypeCutoffs[i] + gTypeCutoffs[j]);
451	+	break;
452	+	case MAX:
453	+	thisRcut = max(gTypeCutoffs[i], gTypeCutoffs[j]);
454	+	break;
455	+	default:
456	+	sprintf(painCave.errMsg,
457	+	"ForceMatrixDecomposition::createGtypeCutoffMap "
458	+	"hit an unknown cutoff policy!\n");
459	+	painCave.severity = OPENMD_ERROR;
460	+	painCave.isFatal = 1;
461	+	simError();
462	+	break;
463	+	}
464	+
465	+	GrCut[i][j] = thisRcut;
466	+	if (thisRcut > largestRcut_) largestRcut_ = thisRcut;
467	+	GrCutSq[i][j] = thisRcut * thisRcut;
468	+	GrlistSq[i][j] = pow(thisRcut + skinThickness_, 2);
469	+
470	+	// pair<int,int> key = make_pair(i,j);
471	+	// gTypeCutoffMap[key].first = thisRcut;
472	+	// gTypeCutoffMap[key].third = pow(thisRcut + skinThickness_, 2);
473	+	// sanity check
474	+
475	+	if (userChoseCutoff_) {
476	+	if (abs(GrCut[i][j] - userCutoff_) > 0.0001) {
477	+	sprintf(painCave.errMsg,
478	+	"ForceMatrixDecomposition::createGtypeCutoffMap "
479	+	"user-specified rCut (%lf) does not match computed group Cutoff\n", userCutoff_);
480	+	painCave.severity = OPENMD_ERROR;
481	+	painCave.isFatal = 1;
482	+	simError();
483	+	}
484	+	}
485	+	}
486	+	}
487		}
488	+
489	+	void ForceMatrixDecomposition::getGroupCutoffs(int &cg1, int &cg2, RealType &rcut, RealType &rcutsq, RealType &rlistsq) {
490	+	int i, j;
491	+	#ifdef IS_MPI
492	+	i = groupRowToGtype[cg1];
493	+	j = groupColToGtype[cg2];
494	+	#else
495	+	i = groupToGtype[cg1];
496	+	j = groupToGtype[cg2];
497	+	#endif
498	+	rcut = GrCut[i][j];
499	+	rcutsq = GrCutSq[i][j];
500	+	rlistsq = GrlistSq[i][j];
501	+	return;
502	+	//return gTypeCutoffMap[make_pair(i,j)];
503	+	}
504	+
505	+	int ForceMatrixDecomposition::getTopologicalDistance(int atom1, int atom2) {
506	+	for (unsigned int j = 0; j < toposForAtom[atom1].size(); j++) {
507	+	if (toposForAtom[atom1][j] == atom2)
508	+	return topoDist[atom1][j];
509	+	}
510	+	return 0;
511	+	}
512	+
513	+	void ForceMatrixDecomposition::zeroWorkArrays() {
514	+	pairwisePot = 0.0;
515	+	embeddingPot = 0.0;
516	+	excludedPot = 0.0;
517	+	excludedSelfPot = 0.0;
518	+
519	+	#ifdef IS_MPI
520	+	if (storageLayout_ & DataStorage::dslForce) {
521	+	fill(atomRowData.force.begin(), atomRowData.force.end(), V3Zero);
522	+	fill(atomColData.force.begin(), atomColData.force.end(), V3Zero);
523	+	}
524	+
525	+	if (storageLayout_ & DataStorage::dslTorque) {
526	+	fill(atomRowData.torque.begin(), atomRowData.torque.end(), V3Zero);
527	+	fill(atomColData.torque.begin(), atomColData.torque.end(), V3Zero);
528	+	}
529
530	+	fill(pot_row.begin(), pot_row.end(),
531	+	Vector<RealType, N_INTERACTION_FAMILIES> (0.0));
532
533	+	fill(pot_col.begin(), pot_col.end(),
534	+	Vector<RealType, N_INTERACTION_FAMILIES> (0.0));
535
536	+	fill(expot_row.begin(), expot_row.end(),
537	+	Vector<RealType, N_INTERACTION_FAMILIES> (0.0));
538	+
539	+	fill(expot_col.begin(), expot_col.end(),
540	+	Vector<RealType, N_INTERACTION_FAMILIES> (0.0));
541	+
542	+	if (storageLayout_ & DataStorage::dslParticlePot) {
543	+	fill(atomRowData.particlePot.begin(), atomRowData.particlePot.end(),
544	+	0.0);
545	+	fill(atomColData.particlePot.begin(), atomColData.particlePot.end(),
546	+	0.0);
547	+	}
548	+
549	+	if (storageLayout_ & DataStorage::dslDensity) {
550	+	fill(atomRowData.density.begin(), atomRowData.density.end(), 0.0);
551	+	fill(atomColData.density.begin(), atomColData.density.end(), 0.0);
552	+	}
553	+
554	+	if (storageLayout_ & DataStorage::dslFunctional) {
555	+	fill(atomRowData.functional.begin(), atomRowData.functional.end(),
556	+	0.0);
557	+	fill(atomColData.functional.begin(), atomColData.functional.end(),
558	+	0.0);
559	+	}
560	+
561	+	if (storageLayout_ & DataStorage::dslFunctionalDerivative) {
562	+	fill(atomRowData.functionalDerivative.begin(),
563	+	atomRowData.functionalDerivative.end(), 0.0);
564	+	fill(atomColData.functionalDerivative.begin(),
565	+	atomColData.functionalDerivative.end(), 0.0);
566	+	}
567	+
568	+	if (storageLayout_ & DataStorage::dslSkippedCharge) {
569	+	fill(atomRowData.skippedCharge.begin(),
570	+	atomRowData.skippedCharge.end(), 0.0);
571	+	fill(atomColData.skippedCharge.begin(),
572	+	atomColData.skippedCharge.end(), 0.0);
573	+	}
574	+
575	+	if (storageLayout_ & DataStorage::dslFlucQForce) {
576	+	fill(atomRowData.flucQFrc.begin(),
577	+	atomRowData.flucQFrc.end(), 0.0);
578	+	fill(atomColData.flucQFrc.begin(),
579	+	atomColData.flucQFrc.end(), 0.0);
580	+	}
581	+
582	+	if (storageLayout_ & DataStorage::dslElectricField) {
583	+	fill(atomRowData.electricField.begin(),
584	+	atomRowData.electricField.end(), V3Zero);
585	+	fill(atomColData.electricField.begin(),
586	+	atomColData.electricField.end(), V3Zero);
587	+	}
588	+
589	+	#endif
590	+	// even in parallel, we need to zero out the local arrays:
591	+
592	+	if (storageLayout_ & DataStorage::dslParticlePot) {
593	+	fill(snap_->atomData.particlePot.begin(),
594	+	snap_->atomData.particlePot.end(), 0.0);
595	+	}
596	+
597	+	if (storageLayout_ & DataStorage::dslDensity) {
598	+	fill(snap_->atomData.density.begin(),
599	+	snap_->atomData.density.end(), 0.0);
600	+	}
601	+
602	+	if (storageLayout_ & DataStorage::dslFunctional) {
603	+	fill(snap_->atomData.functional.begin(),
604	+	snap_->atomData.functional.end(), 0.0);
605	+	}
606	+
607	+	if (storageLayout_ & DataStorage::dslFunctionalDerivative) {
608	+	fill(snap_->atomData.functionalDerivative.begin(),
609	+	snap_->atomData.functionalDerivative.end(), 0.0);
610	+	}
611	+
612	+	if (storageLayout_ & DataStorage::dslSkippedCharge) {
613	+	fill(snap_->atomData.skippedCharge.begin(),
614	+	snap_->atomData.skippedCharge.end(), 0.0);
615	+	}
616	+
617	+	if (storageLayout_ & DataStorage::dslElectricField) {
618	+	fill(snap_->atomData.electricField.begin(),
619	+	snap_->atomData.electricField.end(), V3Zero);
620	+	}
621	+	}
622	+
623	+
624		void ForceMatrixDecomposition::distributeData()  {
625	+	snap_ = sman_->getCurrentSnapshot();
626	+	storageLayout_ = sman_->getStorageLayout();
627		#ifdef IS_MPI
113	–	Snapshot* snap = sman_->getCurrentSnapshot();
628
629		// gather up the atomic positions
630	<	AtomCommVectorRow->gather(snap->atomData.position,
631	<	snap->atomIData.position);
632	<	AtomCommVectorColumn->gather(snap->atomData.position,
633	<	snap->atomJData.position);
630	>	AtomPlanVectorRow->gather(snap_->atomData.position,
631	>	atomRowData.position);
632	>	AtomPlanVectorColumn->gather(snap_->atomData.position,
633	>	atomColData.position);
634
635		// gather up the cutoff group positions
636	<	cgCommVectorRow->gather(snap->cgData.position,
637	<	snap->cgIData.position);
638	<	cgCommVectorColumn->gather(snap->cgData.position,
639	<	snap->cgJData.position);
636	>
637	>	cgPlanVectorRow->gather(snap_->cgData.position,
638	>	cgRowData.position);
639	>
640	>	cgPlanVectorColumn->gather(snap_->cgData.position,
641	>	cgColData.position);
642	>
643	>
644	>
645	>	if (needVelocities_) {
646	>	// gather up the atomic velocities
647	>	AtomPlanVectorColumn->gather(snap_->atomData.velocity,
648	>	atomColData.velocity);
649	>
650	>	cgPlanVectorColumn->gather(snap_->cgData.velocity,
651	>	cgColData.velocity);
652	>	}
653	>
654
655		// if needed, gather the atomic rotation matrices
656	<	if (snap->atomData.getStorageLayout() & DataStorage::dslAmat) {
657	<	AtomCommMatrixRow->gather(snap->atomData.aMat,
658	<	snap->atomIData.aMat);
659	<	AtomCommMatrixColumn->gather(snap->atomData.aMat,
660	<	snap->atomJData.aMat);
656	>	if (storageLayout_ & DataStorage::dslAmat) {
657	>	AtomPlanMatrixRow->gather(snap_->atomData.aMat,
658	>	atomRowData.aMat);
659	>	AtomPlanMatrixColumn->gather(snap_->atomData.aMat,
660	>	atomColData.aMat);
661		}
662	<
663	<	// if needed, gather the atomic eletrostatic frames
664	<	if (snap->atomData.getStorageLayout() & DataStorage::dslElectroFrame) {
665	<	AtomCommMatrixRow->gather(snap->atomData.electroFrame,
666	<	snap->atomIData.electroFrame);
667	<	AtomCommMatrixColumn->gather(snap->atomData.electroFrame,
668	<	snap->atomJData.electroFrame);
662	>
663	>	// if needed, gather the atomic eletrostatic information
664	>	if (storageLayout_ & DataStorage::dslDipole) {
665	>	AtomPlanVectorRow->gather(snap_->atomData.dipole,
666	>	atomRowData.dipole);
667	>	AtomPlanVectorColumn->gather(snap_->atomData.dipole,
668	>	atomColData.dipole);
669		}
670	+
671	+	if (storageLayout_ & DataStorage::dslQuadrupole) {
672	+	AtomPlanMatrixRow->gather(snap_->atomData.quadrupole,
673	+	atomRowData.quadrupole);
674	+	AtomPlanMatrixColumn->gather(snap_->atomData.quadrupole,
675	+	atomColData.quadrupole);
676	+	}
677	+
678	+	// if needed, gather the atomic fluctuating charge values
679	+	if (storageLayout_ & DataStorage::dslFlucQPosition) {
680	+	AtomPlanRealRow->gather(snap_->atomData.flucQPos,
681	+	atomRowData.flucQPos);
682	+	AtomPlanRealColumn->gather(snap_->atomData.flucQPos,
683	+	atomColData.flucQPos);
684	+	}
685	+
686		#endif
687		}
688
689	+	/* collects information obtained during the pre-pair loop onto local
690	+	* data structures.
691	+	*/
692		void ForceMatrixDecomposition::collectIntermediateData() {
693	+	snap_ = sman_->getCurrentSnapshot();
694	+	storageLayout_ = sman_->getStorageLayout();
695		#ifdef IS_MPI
147	–	Snapshot* snap = sman_->getCurrentSnapshot();
696
697	<	if (snap->atomData.getStorageLayout() & DataStorage::dslDensity) {
697	>	if (storageLayout_ & DataStorage::dslDensity) {
698	>
699	>	AtomPlanRealRow->scatter(atomRowData.density,
700	>	snap_->atomData.density);
701	>
702	>	int n = snap_->atomData.density.size();
703	>	vector<RealType> rho_tmp(n, 0.0);
704	>	AtomPlanRealColumn->scatter(atomColData.density, rho_tmp);
705	>	for (int i = 0; i < n; i++)
706	>	snap_->atomData.density[i] += rho_tmp[i];
707	>	}
708
709	<	AtomCommRealRow->scatter(snap->atomIData.density,
710	<	snap->atomData.density);
711	<
712	<	int n = snap->atomData.density.size();
713	<	std::vector<RealType> rho_tmp(n, 0.0);
714	<	AtomCommRealColumn->scatter(snap->atomJData.density, rho_tmp);
709	>	// this isn't necessary if we don't have polarizable atoms, but
710	>	// we'll leave it here for now.
711	>	if (storageLayout_ & DataStorage::dslElectricField) {
712	>
713	>	AtomPlanVectorRow->scatter(atomRowData.electricField,
714	>	snap_->atomData.electricField);
715	>
716	>	int n = snap_->atomData.electricField.size();
717	>	vector<Vector3d> field_tmp(n, V3Zero);
718	>	AtomPlanVectorColumn->scatter(atomColData.electricField,
719	>	field_tmp);
720		for (int i = 0; i < n; i++)
721	<	snap->atomData.density[i] += rho_tmp[i];
721	>	snap_->atomData.electricField[i] += field_tmp[i];
722		}
723		#endif
724		}
725	<
725	>
726	>	/*
727	>	* redistributes information obtained during the pre-pair loop out to
728	>	* row and column-indexed data structures
729	>	*/
730		void ForceMatrixDecomposition::distributeIntermediateData() {
731	+	snap_ = sman_->getCurrentSnapshot();
732	+	storageLayout_ = sman_->getStorageLayout();
733		#ifdef IS_MPI
734	<	Snapshot* snap = sman_->getCurrentSnapshot();
735	<	if (snap->atomData.getStorageLayout() & DataStorage::dslFunctional) {
736	<	AtomCommRealRow->gather(snap->atomData.functional,
737	<	snap->atomIData.functional);
738	<	AtomCommRealColumn->gather(snap->atomData.functional,
170	<	snap->atomJData.functional);
734	>	if (storageLayout_ & DataStorage::dslFunctional) {
735	>	AtomPlanRealRow->gather(snap_->atomData.functional,
736	>	atomRowData.functional);
737	>	AtomPlanRealColumn->gather(snap_->atomData.functional,
738	>	atomColData.functional);
739		}
740
741	<	if (snap->atomData.getStorageLayout() & DataStorage::dslFunctionalDerivative) {
742	<	AtomCommRealRow->gather(snap->atomData.functionalDerivative,
743	<	snap->atomIData.functionalDerivative);
744	<	AtomCommRealColumn->gather(snap->atomData.functionalDerivative,
745	<	snap->atomJData.functionalDerivative);
741	>	if (storageLayout_ & DataStorage::dslFunctionalDerivative) {
742	>	AtomPlanRealRow->gather(snap_->atomData.functionalDerivative,
743	>	atomRowData.functionalDerivative);
744	>	AtomPlanRealColumn->gather(snap_->atomData.functionalDerivative,
745	>	atomColData.functionalDerivative);
746		}
747		#endif
748		}
749
750
751		void ForceMatrixDecomposition::collectData() {
752	<	#ifdef IS_MPI
753	<	Snapshot* snap = sman_->getCurrentSnapshot();
754	<
755	<	int n = snap->atomData.force.size();
752	>	snap_ = sman_->getCurrentSnapshot();
753	>	storageLayout_ = sman_->getStorageLayout();
754	>	#ifdef IS_MPI
755	>	int n = snap_->atomData.force.size();
756		vector<Vector3d> frc_tmp(n, V3Zero);
757
758	<	AtomCommVectorRow->scatter(snap->atomIData.force, frc_tmp);
758	>	AtomPlanVectorRow->scatter(atomRowData.force, frc_tmp);
759		for (int i = 0; i < n; i++) {
760	<	snap->atomData.force[i] += frc_tmp[i];
760	>	snap_->atomData.force[i] += frc_tmp[i];
761		frc_tmp[i] = 0.0;
762		}
763
764	<	AtomCommVectorColumn->scatter(snap->atomJData.force, frc_tmp);
765	<	for (int i = 0; i < n; i++)
766	<	snap->atomData.force[i] += frc_tmp[i];
767	<
768	<
769	<	if (snap->atomData.getStorageLayout() & DataStorage::dslTorque) {
764	>	AtomPlanVectorColumn->scatter(atomColData.force, frc_tmp);
765	>	for (int i = 0; i < n; i++) {
766	>	snap_->atomData.force[i] += frc_tmp[i];
767	>	}
768	>
769	>	if (storageLayout_ & DataStorage::dslTorque) {
770
771	<	int nt = snap->atomData.force.size();
771	>	int nt = snap_->atomData.torque.size();
772		vector<Vector3d> trq_tmp(nt, V3Zero);
773
774	<	AtomCommVectorRow->scatter(snap->atomIData.torque, trq_tmp);
775	<	for (int i = 0; i < n; i++) {
776	<	snap->atomData.torque[i] += trq_tmp[i];
774	>	AtomPlanVectorRow->scatter(atomRowData.torque, trq_tmp);
775	>	for (int i = 0; i < nt; i++) {
776	>	snap_->atomData.torque[i] += trq_tmp[i];
777		trq_tmp[i] = 0.0;
778		}
779
780	<	AtomCommVectorColumn->scatter(snap->atomJData.torque, trq_tmp);
781	<	for (int i = 0; i < n; i++)
782	<	snap->atomData.torque[i] += trq_tmp[i];
780	>	AtomPlanVectorColumn->scatter(atomColData.torque, trq_tmp);
781	>	for (int i = 0; i < nt; i++)
782	>	snap_->atomData.torque[i] += trq_tmp[i];
783		}
784	+
785	+	if (storageLayout_ & DataStorage::dslSkippedCharge) {
786	+
787	+	int ns = snap_->atomData.skippedCharge.size();
788	+	vector<RealType> skch_tmp(ns, 0.0);
789	+
790	+	AtomPlanRealRow->scatter(atomRowData.skippedCharge, skch_tmp);
791	+	for (int i = 0; i < ns; i++) {
792	+	snap_->atomData.skippedCharge[i] += skch_tmp[i];
793	+	skch_tmp[i] = 0.0;
794	+	}
795	+
796	+	AtomPlanRealColumn->scatter(atomColData.skippedCharge, skch_tmp);
797	+	for (int i = 0; i < ns; i++)
798	+	snap_->atomData.skippedCharge[i] += skch_tmp[i];
799	+
800	+	}
801
802	<	int nLocal = snap->getNumberOfAtoms();
802	>	if (storageLayout_ & DataStorage::dslFlucQForce) {
803
804	<	vector<vector<RealType> > pot_temp(N_INTERACTION_FAMILIES,
805	<	vector<RealType> (nLocal, 0.0));
804	>	int nq = snap_->atomData.flucQFrc.size();
805	>	vector<RealType> fqfrc_tmp(nq, 0.0);
806	>
807	>	AtomPlanRealRow->scatter(atomRowData.flucQFrc, fqfrc_tmp);
808	>	for (int i = 0; i < nq; i++) {
809	>	snap_->atomData.flucQFrc[i] += fqfrc_tmp[i];
810	>	fqfrc_tmp[i] = 0.0;
811	>	}
812	>
813	>	AtomPlanRealColumn->scatter(atomColData.flucQFrc, fqfrc_tmp);
814	>	for (int i = 0; i < nq; i++)
815	>	snap_->atomData.flucQFrc[i] += fqfrc_tmp[i];
816	>
817	>	}
818	>
819	>	if (storageLayout_ & DataStorage::dslElectricField) {
820	>
821	>	int nef = snap_->atomData.electricField.size();
822	>	vector<Vector3d> efield_tmp(nef, V3Zero);
823	>
824	>	AtomPlanVectorRow->scatter(atomRowData.electricField, efield_tmp);
825	>	for (int i = 0; i < nef; i++) {
826	>	snap_->atomData.electricField[i] += efield_tmp[i];
827	>	efield_tmp[i] = 0.0;
828	>	}
829	>
830	>	AtomPlanVectorColumn->scatter(atomColData.electricField, efield_tmp);
831	>	for (int i = 0; i < nef; i++)
832	>	snap_->atomData.electricField[i] += efield_tmp[i];
833	>	}
834	>
835	>
836	>	nLocal_ = snap_->getNumberOfAtoms();
837	>
838	>	vector<potVec> pot_temp(nLocal_,
839	>	Vector<RealType, N_INTERACTION_FAMILIES> (0.0));
840	>	vector<potVec> expot_temp(nLocal_,
841	>	Vector<RealType, N_INTERACTION_FAMILIES> (0.0));
842	>
843	>	// scatter/gather pot_row into the members of my column
844	>
845	>	AtomPlanPotRow->scatter(pot_row, pot_temp);
846	>	AtomPlanPotRow->scatter(expot_row, expot_temp);
847	>
848	>	for (int ii = 0;  ii < pot_temp.size(); ii++ )
849	>	pairwisePot += pot_temp[ii];
850	>
851	>	for (int ii = 0;  ii < expot_temp.size(); ii++ )
852	>	excludedPot += expot_temp[ii];
853	>
854	>	if (storageLayout_ & DataStorage::dslParticlePot) {
855	>	// This is the pairwise contribution to the particle pot.  The
856	>	// embedding contribution is added in each of the low level
857	>	// non-bonded routines.  In single processor, this is done in
858	>	// unpackInteractionData, not in collectData.
859	>	for (int ii = 0; ii < N_INTERACTION_FAMILIES; ii++) {
860	>	for (int i = 0; i < nLocal_; i++) {
861	>	// factor of two is because the total potential terms are divided
862	>	// by 2 in parallel due to row/ column scatter
863	>	snap_->atomData.particlePot[i] += 2.0 * pot_temp[i](ii);
864	>	}
865	>	}
866	>	}
867	>
868	>	fill(pot_temp.begin(), pot_temp.end(),
869	>	Vector<RealType, N_INTERACTION_FAMILIES> (0.0));
870	>	fill(expot_temp.begin(), expot_temp.end(),
871	>	Vector<RealType, N_INTERACTION_FAMILIES> (0.0));
872	>
873	>	AtomPlanPotColumn->scatter(pot_col, pot_temp);
874	>	AtomPlanPotColumn->scatter(expot_col, expot_temp);
875
876	<	for (int i = 0; i < N_INTERACTION_FAMILIES; i++) {
877	<	AtomCommRealRow->scatter(pot_row[i], pot_temp[i]);
878	<	for (int ii = 0;  ii < pot_temp[i].size(); ii++ ) {
879	<	pot_local[i] += pot_temp[i][ii];
876	>	for (int ii = 0;  ii < pot_temp.size(); ii++ )
877	>	pairwisePot += pot_temp[ii];
878	>
879	>	for (int ii = 0;  ii < expot_temp.size(); ii++ )
880	>	excludedPot += expot_temp[ii];
881	>
882	>	if (storageLayout_ & DataStorage::dslParticlePot) {
883	>	// This is the pairwise contribution to the particle pot.  The
884	>	// embedding contribution is added in each of the low level
885	>	// non-bonded routines.  In single processor, this is done in
886	>	// unpackInteractionData, not in collectData.
887	>	for (int ii = 0; ii < N_INTERACTION_FAMILIES; ii++) {
888	>	for (int i = 0; i < nLocal_; i++) {
889	>	// factor of two is because the total potential terms are divided
890	>	// by 2 in parallel due to row/ column scatter
891	>	snap_->atomData.particlePot[i] += 2.0 * pot_temp[i](ii);
892	>	}
893		}
894		}
895	+
896	+	if (storageLayout_ & DataStorage::dslParticlePot) {
897	+	int npp = snap_->atomData.particlePot.size();
898	+	vector<RealType> ppot_temp(npp, 0.0);
899	+
900	+	// This is the direct or embedding contribution to the particle
901	+	// pot.
902	+
903	+	AtomPlanRealRow->scatter(atomRowData.particlePot, ppot_temp);
904	+	for (int i = 0; i < npp; i++) {
905	+	snap_->atomData.particlePot[i] += ppot_temp[i];
906	+	}
907	+
908	+	fill(ppot_temp.begin(), ppot_temp.end(), 0.0);
909	+
910	+	AtomPlanRealColumn->scatter(atomColData.particlePot, ppot_temp);
911	+	for (int i = 0; i < npp; i++) {
912	+	snap_->atomData.particlePot[i] += ppot_temp[i];
913	+	}
914	+	}
915	+
916	+	for (int ii = 0; ii < N_INTERACTION_FAMILIES; ii++) {
917	+	RealType ploc1 = pairwisePot[ii];
918	+	RealType ploc2 = 0.0;
919	+	MPI_Allreduce(&ploc1, &ploc2, 1, MPI_REALTYPE, MPI_SUM, MPI_COMM_WORLD);
920	+	pairwisePot[ii] = ploc2;
921	+	}
922	+
923	+	for (int ii = 0; ii < N_INTERACTION_FAMILIES; ii++) {
924	+	RealType ploc1 = excludedPot[ii];
925	+	RealType ploc2 = 0.0;
926	+	MPI_Allreduce(&ploc1, &ploc2, 1, MPI_REALTYPE, MPI_SUM, MPI_COMM_WORLD);
927	+	excludedPot[ii] = ploc2;
928	+	}
929	+
930	+	// Here be dragons.
931	+	MPI_Comm col = colComm.getComm();
932	+
933	+	MPI_Allreduce(MPI_IN_PLACE,
934	+	&snap_->frameData.conductiveHeatFlux[0], 3,
935	+	MPI_REALTYPE, MPI_SUM, col);
936	+
937	+
938		#endif
939	+
940		}
941	+
942	+	/**
943	+	* Collects information obtained during the post-pair (and embedding
944	+	* functional) loops onto local data structures.
945	+	*/
946	+	void ForceMatrixDecomposition::collectSelfData() {
947	+	snap_ = sman_->getCurrentSnapshot();
948	+	storageLayout_ = sman_->getStorageLayout();
949	+
950	+	#ifdef IS_MPI
951	+	for (int ii = 0; ii < N_INTERACTION_FAMILIES; ii++) {
952	+	RealType ploc1 = embeddingPot[ii];
953	+	RealType ploc2 = 0.0;
954	+	MPI_Allreduce(&ploc1, &ploc2, 1, MPI_REALTYPE, MPI_SUM, MPI_COMM_WORLD);
955	+	embeddingPot[ii] = ploc2;
956	+	}
957	+	for (int ii = 0; ii < N_INTERACTION_FAMILIES; ii++) {
958	+	RealType ploc1 = excludedSelfPot[ii];
959	+	RealType ploc2 = 0.0;
960	+	MPI_Allreduce(&ploc1, &ploc2, 1, MPI_REALTYPE, MPI_SUM, MPI_COMM_WORLD);
961	+	excludedSelfPot[ii] = ploc2;
962	+	}
963	+	#endif
964	+
965	+	}
966	+
967	+
968	+
969	+	int& ForceMatrixDecomposition::getNAtomsInRow() {
970	+	#ifdef IS_MPI
971	+	return nAtomsInRow_;
972	+	#else
973	+	return nLocal_;
974	+	#endif
975	+	}
976	+
977	+	/**
978	+	* returns the list of atoms belonging to this group.
979	+	*/
980	+	vector<int>& ForceMatrixDecomposition::getAtomsInGroupRow(int cg1){
981	+	#ifdef IS_MPI
982	+	return groupListRow_[cg1];
983	+	#else
984	+	return groupList_[cg1];
985	+	#endif
986	+	}
987	+
988	+	vector<int>& ForceMatrixDecomposition::getAtomsInGroupColumn(int cg2){
989	+	#ifdef IS_MPI
990	+	return groupListCol_[cg2];
991	+	#else
992	+	return groupList_[cg2];
993	+	#endif
994	+	}
995
996	+	Vector3d ForceMatrixDecomposition::getIntergroupVector(int cg1, int cg2){
997	+	Vector3d d;
998	+
999	+	#ifdef IS_MPI
1000	+	d = cgColData.position[cg2] - cgRowData.position[cg1];
1001	+	#else
1002	+	d = snap_->cgData.position[cg2] - snap_->cgData.position[cg1];
1003	+	#endif
1004	+
1005	+	if (usePeriodicBoundaryConditions_) {
1006	+	snap_->wrapVector(d);
1007	+	}
1008	+	return d;
1009	+	}
1010	+
1011	+	Vector3d& ForceMatrixDecomposition::getGroupVelocityColumn(int cg2){
1012	+	#ifdef IS_MPI
1013	+	return cgColData.velocity[cg2];
1014	+	#else
1015	+	return snap_->cgData.velocity[cg2];
1016	+	#endif
1017	+	}
1018	+
1019	+	Vector3d& ForceMatrixDecomposition::getAtomVelocityColumn(int atom2){
1020	+	#ifdef IS_MPI
1021	+	return atomColData.velocity[atom2];
1022	+	#else
1023	+	return snap_->atomData.velocity[atom2];
1024	+	#endif
1025	+	}
1026	+
1027	+
1028	+	Vector3d ForceMatrixDecomposition::getAtomToGroupVectorRow(int atom1, int cg1){
1029	+
1030	+	Vector3d d;
1031	+
1032	+	#ifdef IS_MPI
1033	+	d = cgRowData.position[cg1] - atomRowData.position[atom1];
1034	+	#else
1035	+	d = snap_->cgData.position[cg1] - snap_->atomData.position[atom1];
1036	+	#endif
1037	+	if (usePeriodicBoundaryConditions_) {
1038	+	snap_->wrapVector(d);
1039	+	}
1040	+	return d;
1041	+	}
1042	+
1043	+	Vector3d ForceMatrixDecomposition::getAtomToGroupVectorColumn(int atom2, int cg2){
1044	+	Vector3d d;
1045	+
1046	+	#ifdef IS_MPI
1047	+	d = cgColData.position[cg2] - atomColData.position[atom2];
1048	+	#else
1049	+	d = snap_->cgData.position[cg2] - snap_->atomData.position[atom2];
1050	+	#endif
1051	+	if (usePeriodicBoundaryConditions_) {
1052	+	snap_->wrapVector(d);
1053	+	}
1054	+	return d;
1055	+	}
1056	+
1057	+	RealType& ForceMatrixDecomposition::getMassFactorRow(int atom1) {
1058	+	#ifdef IS_MPI
1059	+	return massFactorsRow[atom1];
1060	+	#else
1061	+	return massFactors[atom1];
1062	+	#endif
1063	+	}
1064	+
1065	+	RealType& ForceMatrixDecomposition::getMassFactorColumn(int atom2) {
1066	+	#ifdef IS_MPI
1067	+	return massFactorsCol[atom2];
1068	+	#else
1069	+	return massFactors[atom2];
1070	+	#endif
1071	+
1072	+	}
1073	+
1074	+	Vector3d ForceMatrixDecomposition::getInteratomicVector(int atom1, int atom2){
1075	+	Vector3d d;
1076	+
1077	+	#ifdef IS_MPI
1078	+	d = atomColData.position[atom2] - atomRowData.position[atom1];
1079	+	#else
1080	+	d = snap_->atomData.position[atom2] - snap_->atomData.position[atom1];
1081	+	#endif
1082	+	if (usePeriodicBoundaryConditions_) {
1083	+	snap_->wrapVector(d);
1084	+	}
1085	+	return d;
1086	+	}
1087	+
1088	+	vector<int>& ForceMatrixDecomposition::getExcludesForAtom(int atom1) {
1089	+	return excludesForAtom[atom1];
1090	+	}
1091	+
1092	+	/**
1093	+	* We need to exclude some overcounted interactions that result from
1094	+	* the parallel decomposition.
1095	+	*/
1096	+	bool ForceMatrixDecomposition::skipAtomPair(int atom1, int atom2, int cg1, int cg2) {
1097	+	int unique_id_1, unique_id_2;
1098	+
1099	+	#ifdef IS_MPI
1100	+	// in MPI, we have to look up the unique IDs for each atom
1101	+	unique_id_1 = AtomRowToGlobal[atom1];
1102	+	unique_id_2 = AtomColToGlobal[atom2];
1103	+	// group1 = cgRowToGlobal[cg1];
1104	+	// group2 = cgColToGlobal[cg2];
1105	+	#else
1106	+	unique_id_1 = AtomLocalToGlobal[atom1];
1107	+	unique_id_2 = AtomLocalToGlobal[atom2];
1108	+	int group1 = cgLocalToGlobal[cg1];
1109	+	int group2 = cgLocalToGlobal[cg2];
1110	+	#endif
1111	+
1112	+	if (unique_id_1 == unique_id_2) return true;
1113	+
1114	+	#ifdef IS_MPI
1115	+	// this prevents us from doing the pair on multiple processors
1116	+	if (unique_id_1 < unique_id_2) {
1117	+	if ((unique_id_1 + unique_id_2) % 2 == 0) return true;
1118	+	} else {
1119	+	if ((unique_id_1 + unique_id_2) % 2 == 1) return true;
1120	+	}
1121	+	#endif
1122	+
1123	+	#ifndef IS_MPI
1124	+	if (group1 == group2) {
1125	+	if (unique_id_1 < unique_id_2) return true;
1126	+	}
1127	+	#endif
1128	+
1129	+	return false;
1130	+	}
1131	+
1132	+	/**
1133	+	* We need to handle the interactions for atoms who are involved in
1134	+	* the same rigid body as well as some short range interactions
1135	+	* (bonds, bends, torsions) differently from other interactions.
1136	+	* We'll still visit the pairwise routines, but with a flag that
1137	+	* tells those routines to exclude the pair from direct long range
1138	+	* interactions.  Some indirect interactions (notably reaction
1139	+	* field) must still be handled for these pairs.
1140	+	*/
1141	+	bool ForceMatrixDecomposition::excludeAtomPair(int atom1, int atom2) {
1142	+
1143	+	// excludesForAtom was constructed to use row/column indices in the MPI
1144	+	// version, and to use local IDs in the non-MPI version:
1145	+
1146	+	for (vector<int>::iterator i = excludesForAtom[atom1].begin();
1147	+	i != excludesForAtom[atom1].end(); ++i) {
1148	+	if ( (*i) == atom2 ) return true;
1149	+	}
1150	+
1151	+	return false;
1152	+	}
1153	+
1154	+
1155	+	void ForceMatrixDecomposition::addForceToAtomRow(int atom1, Vector3d fg){
1156	+	#ifdef IS_MPI
1157	+	atomRowData.force[atom1] += fg;
1158	+	#else
1159	+	snap_->atomData.force[atom1] += fg;
1160	+	#endif
1161	+	}
1162	+
1163	+	void ForceMatrixDecomposition::addForceToAtomColumn(int atom2, Vector3d fg){
1164	+	#ifdef IS_MPI
1165	+	atomColData.force[atom2] += fg;
1166	+	#else
1167	+	snap_->atomData.force[atom2] += fg;
1168	+	#endif
1169	+	}
1170	+
1171	+	// filling interaction blocks with pointers
1172	+	void ForceMatrixDecomposition::fillInteractionData(InteractionData &idat,
1173	+	int atom1, int atom2) {
1174	+
1175	+	idat.excluded = excludeAtomPair(atom1, atom2);
1176	+
1177	+	#ifdef IS_MPI
1178	+	//idat.atypes = make_pair( atypesRow[atom1], atypesCol[atom2]);
1179	+	idat.atid1 = identsRow[atom1];
1180	+	idat.atid2 = identsCol[atom2];
1181	+
1182	+	if (regionsRow[atom1] >= 0 && regionsCol[atom2] >= 0) {
1183	+	idat.sameRegion = (regionsRow[atom1] == regionsCol[atom2]);
1184	+	} else {
1185	+	idat.sameRegion = false;
1186	+	}
1187	+
1188	+	if (storageLayout_ & DataStorage::dslAmat) {
1189	+	idat.A1 = &(atomRowData.aMat[atom1]);
1190	+	idat.A2 = &(atomColData.aMat[atom2]);
1191	+	}
1192	+
1193	+	if (storageLayout_ & DataStorage::dslTorque) {
1194	+	idat.t1 = &(atomRowData.torque[atom1]);
1195	+	idat.t2 = &(atomColData.torque[atom2]);
1196	+	}
1197	+
1198	+	if (storageLayout_ & DataStorage::dslDipole) {
1199	+	idat.dipole1 = &(atomRowData.dipole[atom1]);
1200	+	idat.dipole2 = &(atomColData.dipole[atom2]);
1201	+	}
1202	+
1203	+	if (storageLayout_ & DataStorage::dslQuadrupole) {
1204	+	idat.quadrupole1 = &(atomRowData.quadrupole[atom1]);
1205	+	idat.quadrupole2 = &(atomColData.quadrupole[atom2]);
1206	+	}
1207	+
1208	+	if (storageLayout_ & DataStorage::dslDensity) {
1209	+	idat.rho1 = &(atomRowData.density[atom1]);
1210	+	idat.rho2 = &(atomColData.density[atom2]);
1211	+	}
1212	+
1213	+	if (storageLayout_ & DataStorage::dslFunctional) {
1214	+	idat.frho1 = &(atomRowData.functional[atom1]);
1215	+	idat.frho2 = &(atomColData.functional[atom2]);
1216	+	}
1217	+
1218	+	if (storageLayout_ & DataStorage::dslFunctionalDerivative) {
1219	+	idat.dfrho1 = &(atomRowData.functionalDerivative[atom1]);
1220	+	idat.dfrho2 = &(atomColData.functionalDerivative[atom2]);
1221	+	}
1222	+
1223	+	if (storageLayout_ & DataStorage::dslParticlePot) {
1224	+	idat.particlePot1 = &(atomRowData.particlePot[atom1]);
1225	+	idat.particlePot2 = &(atomColData.particlePot[atom2]);
1226	+	}
1227	+
1228	+	if (storageLayout_ & DataStorage::dslSkippedCharge) {
1229	+	idat.skippedCharge1 = &(atomRowData.skippedCharge[atom1]);
1230	+	idat.skippedCharge2 = &(atomColData.skippedCharge[atom2]);
1231	+	}
1232	+
1233	+	if (storageLayout_ & DataStorage::dslFlucQPosition) {
1234	+	idat.flucQ1 = &(atomRowData.flucQPos[atom1]);
1235	+	idat.flucQ2 = &(atomColData.flucQPos[atom2]);
1236	+	}
1237	+
1238	+	#else
1239	+
1240	+	//idat.atypes = make_pair( atypesLocal[atom1], atypesLocal[atom2]);
1241	+	idat.atid1 = idents[atom1];
1242	+	idat.atid2 = idents[atom2];
1243	+
1244	+	if (regions[atom1] >= 0 && regions[atom2] >= 0) {
1245	+	idat.sameRegion = (regions[atom1] == regions[atom2]);
1246	+	} else {
1247	+	idat.sameRegion = false;
1248	+	}
1249	+
1250	+	if (storageLayout_ & DataStorage::dslAmat) {
1251	+	idat.A1 = &(snap_->atomData.aMat[atom1]);
1252	+	idat.A2 = &(snap_->atomData.aMat[atom2]);
1253	+	}
1254	+
1255	+	if (storageLayout_ & DataStorage::dslTorque) {
1256	+	idat.t1 = &(snap_->atomData.torque[atom1]);
1257	+	idat.t2 = &(snap_->atomData.torque[atom2]);
1258	+	}
1259	+
1260	+	if (storageLayout_ & DataStorage::dslDipole) {
1261	+	idat.dipole1 = &(snap_->atomData.dipole[atom1]);
1262	+	idat.dipole2 = &(snap_->atomData.dipole[atom2]);
1263	+	}
1264	+
1265	+	if (storageLayout_ & DataStorage::dslQuadrupole) {
1266	+	idat.quadrupole1 = &(snap_->atomData.quadrupole[atom1]);
1267	+	idat.quadrupole2 = &(snap_->atomData.quadrupole[atom2]);
1268	+	}
1269	+
1270	+	if (storageLayout_ & DataStorage::dslDensity) {
1271	+	idat.rho1 = &(snap_->atomData.density[atom1]);
1272	+	idat.rho2 = &(snap_->atomData.density[atom2]);
1273	+	}
1274	+
1275	+	if (storageLayout_ & DataStorage::dslFunctional) {
1276	+	idat.frho1 = &(snap_->atomData.functional[atom1]);
1277	+	idat.frho2 = &(snap_->atomData.functional[atom2]);
1278	+	}
1279	+
1280	+	if (storageLayout_ & DataStorage::dslFunctionalDerivative) {
1281	+	idat.dfrho1 = &(snap_->atomData.functionalDerivative[atom1]);
1282	+	idat.dfrho2 = &(snap_->atomData.functionalDerivative[atom2]);
1283	+	}
1284	+
1285	+	if (storageLayout_ & DataStorage::dslParticlePot) {
1286	+	idat.particlePot1 = &(snap_->atomData.particlePot[atom1]);
1287	+	idat.particlePot2 = &(snap_->atomData.particlePot[atom2]);
1288	+	}
1289	+
1290	+	if (storageLayout_ & DataStorage::dslSkippedCharge) {
1291	+	idat.skippedCharge1 = &(snap_->atomData.skippedCharge[atom1]);
1292	+	idat.skippedCharge2 = &(snap_->atomData.skippedCharge[atom2]);
1293	+	}
1294	+
1295	+	if (storageLayout_ & DataStorage::dslFlucQPosition) {
1296	+	idat.flucQ1 = &(snap_->atomData.flucQPos[atom1]);
1297	+	idat.flucQ2 = &(snap_->atomData.flucQPos[atom2]);
1298	+	}
1299	+
1300	+	#endif
1301	+	}
1302	+
1303	+
1304	+	void ForceMatrixDecomposition::unpackInteractionData(InteractionData &idat, int atom1, int atom2) {
1305	+	#ifdef IS_MPI
1306	+	pot_row[atom1] += RealType(0.5) *  *(idat.pot);
1307	+	pot_col[atom2] += RealType(0.5) *  *(idat.pot);
1308	+	expot_row[atom1] += RealType(0.5) *  *(idat.excludedPot);
1309	+	expot_col[atom2] += RealType(0.5) *  *(idat.excludedPot);
1310	+
1311	+	atomRowData.force[atom1] += *(idat.f1);
1312	+	atomColData.force[atom2] -= *(idat.f1);
1313	+
1314	+	if (storageLayout_ & DataStorage::dslFlucQForce) {
1315	+	atomRowData.flucQFrc[atom1] -= *(idat.dVdFQ1);
1316	+	atomColData.flucQFrc[atom2] -= *(idat.dVdFQ2);
1317	+	}
1318	+
1319	+	if (storageLayout_ & DataStorage::dslElectricField) {
1320	+	atomRowData.electricField[atom1] += *(idat.eField1);
1321	+	atomColData.electricField[atom2] += *(idat.eField2);
1322	+	}
1323	+
1324	+	#else
1325	+	pairwisePot += *(idat.pot);
1326	+	excludedPot += *(idat.excludedPot);
1327	+
1328	+	snap_->atomData.force[atom1] += *(idat.f1);
1329	+	snap_->atomData.force[atom2] -= *(idat.f1);
1330	+
1331	+	if (idat.doParticlePot) {
1332	+	// This is the pairwise contribution to the particle pot.  The
1333	+	// embedding contribution is added in each of the low level
1334	+	// non-bonded routines.  In parallel, this calculation is done
1335	+	// in collectData, not in unpackInteractionData.
1336	+	snap_->atomData.particlePot[atom1] += *(idat.vpair) * *(idat.sw);
1337	+	snap_->atomData.particlePot[atom2] += *(idat.vpair) * *(idat.sw);
1338	+	}
1339	+
1340	+	if (storageLayout_ & DataStorage::dslFlucQForce) {
1341	+	snap_->atomData.flucQFrc[atom1] -= *(idat.dVdFQ1);
1342	+	snap_->atomData.flucQFrc[atom2] -= *(idat.dVdFQ2);
1343	+	}
1344	+
1345	+	if (storageLayout_ & DataStorage::dslElectricField) {
1346	+	snap_->atomData.electricField[atom1] += *(idat.eField1);
1347	+	snap_->atomData.electricField[atom2] += *(idat.eField2);
1348	+	}
1349	+
1350	+	#endif
1351	+
1352	+	}
1353	+
1354	+	/*
1355	+	* buildNeighborList
1356	+	*
1357	+	* first element of pair is row-indexed CutoffGroup
1358	+	* second element of pair is column-indexed CutoffGroup
1359	+	*/
1360	+	void ForceMatrixDecomposition::buildNeighborList(vector<pair<int,int> >& neighborList) {
1361	+
1362	+	neighborList.clear();
1363	+	groupCutoffs cuts;
1364	+	bool doAllPairs = false;
1365	+
1366	+	RealType rList_ = (largestRcut_ + skinThickness_);
1367	+	RealType rcut, rcutsq, rlistsq;
1368	+	Snapshot* snap_ = sman_->getCurrentSnapshot();
1369	+	Mat3x3d box;
1370	+	Mat3x3d invBox;
1371	+
1372	+	Vector3d rs, scaled, dr;
1373	+	Vector3i whichCell;
1374	+	int cellIndex;
1375	+
1376	+	#ifdef IS_MPI
1377	+	cellListRow_.clear();
1378	+	cellListCol_.clear();
1379	+	#else
1380	+	cellList_.clear();
1381	+	#endif
1382	+
1383	+	if (!usePeriodicBoundaryConditions_) {
1384	+	box = snap_->getBoundingBox();
1385	+	invBox = snap_->getInvBoundingBox();
1386	+	} else {
1387	+	box = snap_->getHmat();
1388	+	invBox = snap_->getInvHmat();
1389	+	}
1390	+
1391	+	Vector3d boxX = box.getColumn(0);
1392	+	Vector3d boxY = box.getColumn(1);
1393	+	Vector3d boxZ = box.getColumn(2);
1394	+
1395	+	nCells_.x() = int( boxX.length() / rList_ );
1396	+	nCells_.y() = int( boxY.length() / rList_ );
1397	+	nCells_.z() = int( boxZ.length() / rList_ );
1398	+
1399	+	// handle small boxes where the cell offsets can end up repeating cells
1400	+
1401	+	if (nCells_.x() < 3) doAllPairs = true;
1402	+	if (nCells_.y() < 3) doAllPairs = true;
1403	+	if (nCells_.z() < 3) doAllPairs = true;
1404	+
1405	+	int nCtot = nCells_.x() * nCells_.y() * nCells_.z();
1406	+
1407	+	#ifdef IS_MPI
1408	+	cellListRow_.resize(nCtot);
1409	+	cellListCol_.resize(nCtot);
1410	+	#else
1411	+	cellList_.resize(nCtot);
1412	+	#endif
1413	+
1414	+	if (!doAllPairs) {
1415	+	#ifdef IS_MPI
1416	+
1417	+	for (int i = 0; i < nGroupsInRow_; i++) {
1418	+	rs = cgRowData.position[i];
1419	+
1420	+	// scaled positions relative to the box vectors
1421	+	scaled = invBox * rs;
1422	+
1423	+	// wrap the vector back into the unit box by subtracting integer box
1424	+	// numbers
1425	+	for (int j = 0; j < 3; j++) {
1426	+	scaled[j] -= roundMe(scaled[j]);
1427	+	scaled[j] += 0.5;
1428	+	// Handle the special case when an object is exactly on the
1429	+	// boundary (a scaled coordinate of 1.0 is the same as
1430	+	// scaled coordinate of 0.0)
1431	+	if (scaled[j] >= 1.0) scaled[j] -= 1.0;
1432	+	}
1433	+
1434	+	// find xyz-indices of cell that cutoffGroup is in.
1435	+	whichCell.x() = nCells_.x() * scaled.x();
1436	+	whichCell.y() = nCells_.y() * scaled.y();
1437	+	whichCell.z() = nCells_.z() * scaled.z();
1438	+
1439	+	// find single index of this cell:
1440	+	cellIndex = Vlinear(whichCell, nCells_);
1441	+
1442	+	// add this cutoff group to the list of groups in this cell;
1443	+	cellListRow_[cellIndex].push_back(i);
1444	+	}
1445	+	for (int i = 0; i < nGroupsInCol_; i++) {
1446	+	rs = cgColData.position[i];
1447	+
1448	+	// scaled positions relative to the box vectors
1449	+	scaled = invBox * rs;
1450	+
1451	+	// wrap the vector back into the unit box by subtracting integer box
1452	+	// numbers
1453	+	for (int j = 0; j < 3; j++) {
1454	+	scaled[j] -= roundMe(scaled[j]);
1455	+	scaled[j] += 0.5;
1456	+	// Handle the special case when an object is exactly on the
1457	+	// boundary (a scaled coordinate of 1.0 is the same as
1458	+	// scaled coordinate of 0.0)
1459	+	if (scaled[j] >= 1.0) scaled[j] -= 1.0;
1460	+	}
1461	+
1462	+	// find xyz-indices of cell that cutoffGroup is in.
1463	+	whichCell.x() = nCells_.x() * scaled.x();
1464	+	whichCell.y() = nCells_.y() * scaled.y();
1465	+	whichCell.z() = nCells_.z() * scaled.z();
1466	+
1467	+	// find single index of this cell:
1468	+	cellIndex = Vlinear(whichCell, nCells_);
1469	+
1470	+	// add this cutoff group to the list of groups in this cell;
1471	+	cellListCol_[cellIndex].push_back(i);
1472	+	}
1473	+
1474	+	#else
1475	+	for (int i = 0; i < nGroups_; i++) {
1476	+	rs = snap_->cgData.position[i];
1477	+
1478	+	// scaled positions relative to the box vectors
1479	+	scaled = invBox * rs;
1480	+
1481	+	// wrap the vector back into the unit box by subtracting integer box
1482	+	// numbers
1483	+	for (int j = 0; j < 3; j++) {
1484	+	scaled[j] -= roundMe(scaled[j]);
1485	+	scaled[j] += 0.5;
1486	+	// Handle the special case when an object is exactly on the
1487	+	// boundary (a scaled coordinate of 1.0 is the same as
1488	+	// scaled coordinate of 0.0)
1489	+	if (scaled[j] >= 1.0) scaled[j] -= 1.0;
1490	+	}
1491	+
1492	+	// find xyz-indices of cell that cutoffGroup is in.
1493	+	whichCell.x() = int(nCells_.x() * scaled.x());
1494	+	whichCell.y() = int(nCells_.y() * scaled.y());
1495	+	whichCell.z() = int(nCells_.z() * scaled.z());
1496	+
1497	+	// find single index of this cell:
1498	+	cellIndex = Vlinear(whichCell, nCells_);
1499	+
1500	+	// add this cutoff group to the list of groups in this cell;
1501	+	cellList_[cellIndex].push_back(i);
1502	+	}
1503	+
1504	+	#endif
1505	+
1506	+	for (int m1z = 0; m1z < nCells_.z(); m1z++) {
1507	+	for (int m1y = 0; m1y < nCells_.y(); m1y++) {
1508	+	for (int m1x = 0; m1x < nCells_.x(); m1x++) {
1509	+	Vector3i m1v(m1x, m1y, m1z);
1510	+	int m1 = Vlinear(m1v, nCells_);
1511	+
1512	+	for (vector<Vector3i>::iterator os = cellOffsets_.begin();
1513	+	os != cellOffsets_.end(); ++os) {
1514	+
1515	+	Vector3i m2v = m1v + (*os);
1516	+
1517	+
1518	+	if (m2v.x() >= nCells_.x()) {
1519	+	m2v.x() = 0;
1520	+	} else if (m2v.x() < 0) {
1521	+	m2v.x() = nCells_.x() - 1;
1522	+	}
1523	+
1524	+	if (m2v.y() >= nCells_.y()) {
1525	+	m2v.y() = 0;
1526	+	} else if (m2v.y() < 0) {
1527	+	m2v.y() = nCells_.y() - 1;
1528	+	}
1529	+
1530	+	if (m2v.z() >= nCells_.z()) {
1531	+	m2v.z() = 0;
1532	+	} else if (m2v.z() < 0) {
1533	+	m2v.z() = nCells_.z() - 1;
1534	+	}
1535	+
1536	+	int m2 = Vlinear (m2v, nCells_);
1537	+
1538	+	#ifdef IS_MPI
1539	+	for (vector<int>::iterator j1 = cellListRow_[m1].begin();
1540	+	j1 != cellListRow_[m1].end(); ++j1) {
1541	+	for (vector<int>::iterator j2 = cellListCol_[m2].begin();
1542	+	j2 != cellListCol_[m2].end(); ++j2) {
1543	+
1544	+	// In parallel, we need to visit *all* pairs of row
1545	+	// & column indicies and will divide labor in the
1546	+	// force evaluation later.
1547	+	dr = cgColData.position[(*j2)] - cgRowData.position[(*j1)];
1548	+	if (usePeriodicBoundaryConditions_) {
1549	+	snap_->wrapVector(dr);
1550	+	}
1551	+	getGroupCutoffs( (*j1), (*j2), rcut, rcutsq, rlistsq );
1552	+	if (dr.lengthSquare() < rlistsq) {
1553	+	neighborList.push_back(make_pair((*j1), (*j2)));
1554	+	}
1555	+	}
1556	+	}
1557	+	#else
1558	+	for (vector<int>::iterator j1 = cellList_[m1].begin();
1559	+	j1 != cellList_[m1].end(); ++j1) {
1560	+	for (vector<int>::iterator j2 = cellList_[m2].begin();
1561	+	j2 != cellList_[m2].end(); ++j2) {
1562	+
1563	+	// Always do this if we're in different cells or if
1564	+	// we're in the same cell and the global index of
1565	+	// the j2 cutoff group is greater than or equal to
1566	+	// the j1 cutoff group.  Note that Rappaport's code
1567	+	// has a "less than" conditional here, but that
1568	+	// deals with atom-by-atom computation.  OpenMD
1569	+	// allows atoms within a single cutoff group to
1570	+	// interact with each other.
1571	+
1572	+	if (m2 != m1 || (*j2) >= (*j1) ) {
1573	+
1574	+	dr = snap_->cgData.position[(*j2)] - snap_->cgData.position[(*j1)];
1575	+	if (usePeriodicBoundaryConditions_) {
1576	+	snap_->wrapVector(dr);
1577	+	}
1578	+	getGroupCutoffs( (*j1), (*j2), rcut, rcutsq, rlistsq );
1579	+	if (dr.lengthSquare() < rlistsq) {
1580	+	neighborList.push_back(make_pair((*j1), (*j2)));
1581	+	}
1582	+	}
1583	+	}
1584	+	}
1585	+	#endif
1586	+	}
1587	+	}
1588	+	}
1589	+	}
1590	+	} else {
1591	+	// branch to do all cutoff group pairs
1592	+	#ifdef IS_MPI
1593	+	for (int j1 = 0; j1 < nGroupsInRow_; j1++) {
1594	+	for (int j2 = 0; j2 < nGroupsInCol_; j2++) {
1595	+	dr = cgColData.position[j2] - cgRowData.position[j1];
1596	+	if (usePeriodicBoundaryConditions_) {
1597	+	snap_->wrapVector(dr);
1598	+	}
1599	+	getGroupCutoffs( j1, j2, rcut, rcutsq, rlistsq);
1600	+	if (dr.lengthSquare() < rlistsq) {
1601	+	neighborList.push_back(make_pair(j1, j2));
1602	+	}
1603	+	}
1604	+	}
1605	+	#else
1606	+	// include all groups here.
1607	+	for (int j1 = 0; j1 < nGroups_; j1++) {
1608	+	// include self group interactions j2 == j1
1609	+	for (int j2 = j1; j2 < nGroups_; j2++) {
1610	+	dr = snap_->cgData.position[j2] - snap_->cgData.position[j1];
1611	+	if (usePeriodicBoundaryConditions_) {
1612	+	snap_->wrapVector(dr);
1613	+	}
1614	+	getGroupCutoffs( j1, j2, rcut, rcutsq, rlistsq );
1615	+	if (dr.lengthSquare() < rlistsq) {
1616	+	neighborList.push_back(make_pair(j1, j2));
1617	+	}
1618	+	}
1619	+	}
1620	+	#endif
1621	+	}
1622	+
1623	+	// save the local cutoff group positions for the check that is
1624	+	// done on each loop:
1625	+	saved_CG_positions_.clear();
1626	+	for (int i = 0; i < nGroups_; i++)
1627	+	saved_CG_positions_.push_back(snap_->cgData.position[i]);
1628	+	}
1629		} //end namespace OpenMD

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