46 #ifndef MUELU_REPARTITIONFACTORY_DEF_HPP 47 #define MUELU_REPARTITIONFACTORY_DEF_HPP 56 #include <Teuchos_DefaultMpiComm.hpp> 57 #include <Teuchos_CommHelpers.hpp> 69 #include "MueLu_Utilities.hpp" 71 #include "MueLu_CloneRepartitionInterface.hpp" 79 template <
class Scalar,
class LocalOrdinal,
class GlobalOrdinal,
class Node>
81 RCP<ParameterList> validParamList = rcp(
new ParameterList());
83 #define SET_VALID_ENTRY(name) validParamList->setEntry(name, MasterList::getEntry(name)) 87 #undef SET_VALID_ENTRY 89 validParamList->set< RCP<const FactoryBase> >(
"A", Teuchos::null,
"Factory of the matrix A");
90 validParamList->set< RCP<const FactoryBase> >(
"number of partitions", Teuchos::null,
"Instance of RepartitionHeuristicFactory.");
91 validParamList->set< RCP<const FactoryBase> >(
"Partition", Teuchos::null,
"Factory of the partition");
93 return validParamList;
96 template <
class Scalar,
class LocalOrdinal,
class GlobalOrdinal,
class Node>
98 Input(currentLevel,
"A");
99 Input(currentLevel,
"number of partitions");
100 Input(currentLevel,
"Partition");
110 template <
class Scalar,
class LocalOrdinal,
class GlobalOrdinal,
class Node>
114 const Teuchos::ParameterList & pL = GetParameterList();
117 bool remapPartitions = pL.get<
bool> (
"repartition: remap parts");
120 RCP<Matrix> A = Get< RCP<Matrix> >(currentLevel,
"A");
121 RCP<const Map> rowMap = A->getRowMap();
122 GO indexBase = rowMap->getIndexBase();
128 RCP<const Teuchos::Comm<int> > origComm = rowMap->getComm();
129 RCP<const Teuchos::Comm<int> > comm = origComm->duplicate();
131 int myRank = comm->getRank();
132 int numProcs = comm->getSize();
134 RCP<const Teuchos::MpiComm<int> > tmpic = rcp_dynamic_cast<
const Teuchos::MpiComm<int> >(comm);
135 TEUCHOS_TEST_FOR_EXCEPTION(tmpic == Teuchos::null,
Exceptions::RuntimeError,
"Cannot cast base Teuchos::Comm to Teuchos::MpiComm object.");
136 RCP<const Teuchos::OpaqueWrapper<MPI_Comm> > rawMpiComm = tmpic->getRawMpiComm();
139 int numPartitions = Get<int>(currentLevel,
"number of partitions");
144 RCP<GOVector> decomposition = Get<RCP<GOVector> >(currentLevel,
"Partition");
147 if(remapPartitions ==
true && Teuchos::rcp_dynamic_cast<const CloneRepartitionInterface>(GetFactory(
"Partition")) != Teuchos::null) {
151 remapPartitions =
false;
155 if (numPartitions == 1) {
160 GetOStream(
Warnings0) <<
"Only one partition: Skip call to the repartitioner." << std::endl;
161 }
else if (numPartitions == -1) {
163 GetOStream(
Warnings0) <<
"No repartitioning necessary: partitions were left unchanged by the repartitioner" << std::endl;
164 Set<RCP<const Import> >(currentLevel,
"Importer", Teuchos::null);
205 if (remapPartitions) {
208 DeterminePartitionPlacement(*A, *decomposition, numPartitions);
219 ArrayRCP<const GO> decompEntries;
220 if (decomposition->getLocalLength() > 0)
221 decompEntries = decomposition->getData(0);
223 #ifdef HAVE_MUELU_DEBUG 225 int incorrectRank = -1;
226 for (
int i = 0; i < decompEntries.size(); i++)
227 if (decompEntries[i] >= numProcs || decompEntries[i] < 0) {
228 incorrectRank = myRank;
232 int incorrectGlobalRank = -1;
238 myGIDs.reserve(decomposition->getLocalLength());
243 typedef std::map<GO, Array<GO> > map_type;
245 for (
LO i = 0; i < decompEntries.size(); i++) {
246 GO id = decompEntries[i];
247 GO GID = rowMap->getGlobalElement(i);
250 myGIDs .push_back(GID);
252 sendMap[id].push_back(GID);
254 decompEntries = Teuchos::null;
257 GO numLocalKept = myGIDs.size(), numGlobalKept, numGlobalRows = A->getGlobalNumRows();
259 GetOStream(
Statistics2) <<
"Unmoved rows: " << numGlobalKept <<
" / " << numGlobalRows <<
" (" << 100*Teuchos::as<double>(numGlobalKept)/numGlobalRows <<
"%)" << std::endl;
262 int numSend = sendMap.size(), numRecv;
265 Array<GO> myParts(numSend), myPart(1);
268 for (
typename map_type::const_iterator it = sendMap.begin(); it != sendMap.end(); it++)
269 myParts[cnt++] = it->first;
273 GO partsIndexBase = 0;
274 RCP<Map> partsIHave = MapFactory ::Build(lib, Teuchos::OrdinalTraits<Xpetra::global_size_t>::invalid(), myParts(), partsIndexBase, comm);
275 RCP<Map> partsIOwn = MapFactory ::Build(lib, numProcs, myPart(), partsIndexBase, comm);
276 RCP<Export> partsExport = ExportFactory::Build(partsIHave, partsIOwn);
281 ArrayRCP<GO> partsISendData = partsISend->getDataNonConst(0);
282 for (
int i = 0; i < numSend; i++)
283 partsISendData[i] = 1;
285 (numPartsIRecv->getDataNonConst(0))[0] = 0;
287 numPartsIRecv->doExport(*partsISend, *partsExport,
Xpetra::ADD);
288 numRecv = (numPartsIRecv->getData(0))[0];
295 Array<MPI_Request> sendReqs(numSend);
297 for (
typename map_type::iterator it = sendMap.begin(); it != sendMap.end(); it++)
298 MPI_Isend(static_cast<void*>(it->second.getRawPtr()), it->second.size(), MpiType, Teuchos::as<GO>(it->first), msgTag, *rawMpiComm, &sendReqs[cnt++]);
301 size_t totalGIDs = myGIDs.size();
302 for (
int i = 0; i < numRecv; i++) {
304 MPI_Probe(MPI_ANY_SOURCE, msgTag, *rawMpiComm, &status);
307 int fromRank = status.MPI_SOURCE, count;
308 MPI_Get_count(&status, MpiType, &count);
310 recvMap[fromRank].resize(count);
311 MPI_Recv(static_cast<void*>(recvMap[fromRank].getRawPtr()), count, MpiType, fromRank, msgTag, *rawMpiComm, &status);
318 Array<MPI_Status> sendStatuses(numSend);
319 MPI_Waitall(numSend, sendReqs.getRawPtr(), sendStatuses.getRawPtr());
323 myGIDs.reserve(totalGIDs);
324 for (
typename map_type::const_iterator it = recvMap.begin(); it != recvMap.end(); it++) {
325 int offset = myGIDs.size(), len = it->second.size();
327 myGIDs.resize(offset + len);
328 memcpy(myGIDs.getRawPtr() + offset, it->second.getRawPtr(), len*
sizeof(
GO));
333 std::sort(myGIDs.begin(), myGIDs.end());
336 RCP<Map> newRowMap = MapFactory ::Build(lib, rowMap->getGlobalNumElements(), myGIDs(), indexBase, origComm);
337 RCP<const Import> rowMapImporter;
340 rowMapImporter = ImportFactory::Build(rowMap, newRowMap);
343 Set(currentLevel,
"Importer", rowMapImporter);
348 if (pL.get<
bool>(
"repartition: print partition distribution") && IsPrint(
Statistics2)) {
350 GetOStream(
Statistics2) <<
"Partition distribution over cores (ownership is indicated by '+')" << std::endl;
352 char amActive = (myGIDs.size() ? 1 : 0);
353 std::vector<char> areActive(numProcs, 0);
354 MPI_Gather(&amActive, 1, MPI_CHAR, &areActive[0], 1, MPI_CHAR, 0, *rawMpiComm);
356 int rowWidth = std::min(Teuchos::as<int>(ceil(sqrt(numProcs))), 100);
357 for (
int proc = 0; proc < numProcs; proc += rowWidth) {
358 for (
int j = 0; j < rowWidth; j++)
359 if (proc + j < numProcs)
360 GetOStream(
Statistics2) << (areActive[proc + j] ?
"+" :
".");
364 GetOStream(
Statistics2) <<
" " << proc <<
":" << std::min(proc + rowWidth, numProcs) - 1 << std::endl;
371 template<
typename T,
typename W>
376 template<
typename T,
typename W>
381 template <
class Scalar,
class LocalOrdinal,
class GlobalOrdinal,
class Node>
384 RCP<const Map> rowMap = A.getRowMap();
386 RCP<const Teuchos::Comm<int> > comm = rowMap->getComm()->duplicate();
387 int numProcs = comm->getSize();
389 RCP<const Teuchos::MpiComm<int> > tmpic = rcp_dynamic_cast<
const Teuchos::MpiComm<int> >(comm);
390 TEUCHOS_TEST_FOR_EXCEPTION(tmpic == Teuchos::null,
Exceptions::RuntimeError,
"Cannot cast base Teuchos::Comm to Teuchos::MpiComm object.");
391 RCP<const Teuchos::OpaqueWrapper<MPI_Comm> > rawMpiComm = tmpic->getRawMpiComm();
393 const Teuchos::ParameterList& pL = GetParameterList();
399 const int maxLocal = pL.get<
int>(
"repartition: remap num values");
400 const int dataSize = 2*maxLocal;
402 ArrayRCP<GO> decompEntries;
403 if (decomposition.getLocalLength() > 0)
404 decompEntries = decomposition.getDataNonConst(0);
416 std::map<GO,GO> lEdges;
417 for (
LO i = 0; i < decompEntries.size(); i++)
418 lEdges[decompEntries[i]] += A.getNumEntriesInLocalRow(i);
422 std::multimap<GO,GO> revlEdges;
423 for (
typename std::map<GO,GO>::const_iterator it = lEdges.begin(); it != lEdges.end(); it++)
424 revlEdges.insert(std::make_pair(it->second, it->first));
429 Array<GO> lData(dataSize, -1), gData(numProcs * dataSize);
431 for (
typename std::multimap<GO,GO>::reverse_iterator rit = revlEdges.rbegin(); rit != revlEdges.rend() && numEdges < maxLocal; rit++) {
432 lData[2*numEdges+0] = rit->second;
433 lData[2*numEdges+1] = rit->first;
440 MPI_Allgather(static_cast<void*>(lData.getRawPtr()), dataSize, MpiType, static_cast<void*>(gData.getRawPtr()), dataSize, MpiType, *rawMpiComm);
445 std::vector<Triplet<int,int> > gEdges(numProcs * maxLocal);
447 for (
LO i = 0; i < gData.size(); i += 2) {
448 GO part = gData[i+0];
449 GO weight = gData[i+1];
451 gEdges[k].i = i/dataSize;
453 gEdges[k].v = weight;
461 std::sort(gEdges.begin(), gEdges.end(), compareTriplets<int,int>);
464 std::map<int,int> match;
465 std::vector<char> matchedRanks(numProcs, 0), matchedParts(numProcs, 0);
467 for (
typename std::vector<
Triplet<int,int> >::const_iterator it = gEdges.begin(); it != gEdges.end(); it++) {
470 if (matchedRanks[rank] == 0 && matchedParts[part] == 0) {
471 matchedRanks[rank] = 1;
472 matchedParts[part] = 1;
477 GetOStream(
Statistics1) <<
"Number of unassigned paritions before cleanup stage: " << (numPartitions - numMatched) <<
" / " << numPartitions << std::endl;
482 for (
int part = 0, matcher = 0; part < numProcs; part++)
483 if (match.count(part) == 0) {
485 while (matchedRanks[matcher])
488 match[part] = matcher++;
492 for (
LO i = 0; i < decompEntries.size(); i++)
493 decompEntries[i] = match[decompEntries[i]];
498 #endif //ifdef HAVE_MPI 500 #endif // MUELU_REPARTITIONFACTORY_DEF_HPP RCP< const ParameterList > GetValidParameterList() const
Return a const parameter list of valid parameters that setParameterList() will accept.
Important warning messages (one line)
#define MueLu_sumAll(rcpComm, in, out)
static MPI_Datatype getType()
std::string toString(const T &what)
Little helper function to convert non-string types to strings.
#define MueLu_maxAll(rcpComm, in, out)
Timer to be used in factories. Similar to Monitor but with additional timers.
static MPI_Datatype getType()
Namespace for MueLu classes and methods.
void DeterminePartitionPlacement(const Matrix &A, GOVector &decomposition, GO numPartitions) const
Determine which process should own each partition.
#define SET_VALID_ENTRY(name)
Print even more statistics.
static MPI_Datatype getType()
void Build(Level ¤tLevel) const
Build an object with this factory.
static bool compareTriplets(const Triplet< T, W > &a, const Triplet< T, W > &b)
Class that holds all level-specific information.
Timer to be used in factories. Similar to SubMonitor but adds a timer level by level.
static MPI_Datatype getType()
void DeclareInput(Level ¤tLevel) const
Determines the data that RepartitionFactory needs, and the factories that generate that data...
static RCP< Vector > Build(const Teuchos::RCP< const Map > &map, bool zeroOut=true)
static MPI_Datatype getType()
static MPI_Datatype getType()
Exception throws to report errors in the internal logical of the program.