[620] | 1 | #include "transformation_mapping.hpp" |
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| 2 | #include <boost/unordered_map.hpp> |
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| 3 | #include "context.hpp" |
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| 4 | #include "context_client.hpp" |
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| 5 | |
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| 6 | namespace xios { |
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| 7 | |
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| 8 | CTransformationMapping::CTransformationMapping(CGrid* destination, CGrid* source) |
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| 9 | : gridSource_(source), gridDestination_(destination) |
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| 10 | { |
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| 11 | CContext* context = CContext::getCurrent(); |
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| 12 | CContextClient* client=context->client; |
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| 13 | int clientRank = client->clientRank; |
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| 14 | |
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| 15 | const CArray<size_t,1>& globalIndexGridSrc = gridSource_->getDistributionClient()->getGlobalDataIndexSendToServer(); |
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| 16 | boost::unordered_map<size_t,int> globalIndexOfServer; |
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| 17 | int globalIndexSize = globalIndexGridSrc.numElements(); |
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| 18 | for (int idx = 0; idx < globalIndexSize; ++idx) |
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| 19 | { |
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| 20 | globalIndexOfServer[globalIndexGridSrc(idx)] = clientRank; |
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| 21 | } |
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| 22 | |
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| 23 | gridIndexClientClientMapping_ = new CClientServerMappingDistributed(globalIndexOfServer, |
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| 24 | client->intraComm, |
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| 25 | true); |
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| 26 | } |
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| 27 | |
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| 28 | CTransformationMapping::~CTransformationMapping() |
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| 29 | { |
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| 30 | if (0 != gridIndexClientClientMapping_) delete gridIndexClientClientMapping_; |
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| 31 | } |
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| 32 | |
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| 33 | /*! |
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| 34 | Suppose that we have transformations between two grids, which are represented in form of mapping between global indexes of these two grids, |
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| 35 | this function tries to find out which clients a client need to send and receive these global indexes to accomplish the transformations. |
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| 36 | The grid destination is the grid whose global indexes demande global indexes from the grid source |
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| 37 | Grid destination and grid source are also distributed among clients but in a different manner. |
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| 38 | \param [in] globaIndexMapFromDestToSource mapping representing the transformations |
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| 39 | */ |
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| 40 | void CTransformationMapping::computeTransformationMapping(const std::map<size_t, std::set<size_t> >& globaIndexMapFromDestToSource) |
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| 41 | { |
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| 42 | CContext* context = CContext::getCurrent(); |
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| 43 | CContextClient* client=context->client; |
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| 44 | |
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| 45 | int numMappingPoints = 0; |
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| 46 | std::map<size_t, std::set<size_t> >::const_iterator itbMap = globaIndexMapFromDestToSource.begin(), itMap, |
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| 47 | iteMap = globaIndexMapFromDestToSource.end(); |
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| 48 | for (itMap = itbMap; itMap != iteMap; ++itMap) |
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| 49 | { |
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| 50 | numMappingPoints += (itMap->second).size(); |
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| 51 | } |
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| 52 | |
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| 53 | // All global indexes of a client on grid destination |
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| 54 | CArray<size_t,1> globalIndexMap(numMappingPoints); |
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| 55 | // Not only one index on grid destination can demande two indexes from grid source |
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| 56 | // but an index on grid destination have to be sent to two indexes of grid destination |
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| 57 | std::map<size_t, std::vector<size_t> > globalIndexMapFromSrcToDest; |
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| 58 | std::set<size_t>::const_iterator itbSet, itSet, iteSet; |
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| 59 | int idx = 0; |
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| 60 | for (itMap = itbMap; itMap != iteMap; ++itMap) |
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| 61 | { |
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| 62 | itbSet = (itMap->second).begin(); |
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| 63 | iteSet = (itMap->second).end(); |
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| 64 | for (itSet = itbSet; itSet != iteSet; ++itSet) |
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| 65 | { |
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| 66 | globalIndexMap(idx) = *itSet; |
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| 67 | globalIndexMapFromSrcToDest[*itSet].push_back(itMap->first); |
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| 68 | ++idx; |
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| 69 | } |
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| 70 | } |
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| 71 | |
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| 72 | // Find out on which clients the necessary indexes of grid source are. |
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| 73 | gridIndexClientClientMapping_->computeServerIndexMapping(globalIndexMap); |
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| 74 | const std::map<int, std::vector<size_t> >& globalIndexSentFromGridSource = gridIndexClientClientMapping_->getGlobalIndexOnServer(); |
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| 75 | std::map<int, std::vector<size_t> >::const_iterator itbMapSrc = globalIndexSentFromGridSource.begin(), itMapSrc, |
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| 76 | iteMapSrc = globalIndexSentFromGridSource.end(); |
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| 77 | std::vector<size_t>::const_iterator itbVec, itVec, iteVec; |
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| 78 | for (itMapSrc = itbMapSrc; itMapSrc != iteMapSrc; ++itMapSrc) |
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| 79 | { |
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| 80 | int sourceRank = itMapSrc->first; |
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| 81 | itbVec = (itMapSrc->second).begin(); |
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| 82 | iteVec = (itMapSrc->second).end(); |
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| 83 | for (itVec = itbVec; itVec != iteVec; ++itVec) |
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| 84 | { |
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| 85 | (globalIndexReceivedOnGridDestMapping_[sourceRank]).push_back(globalIndexMapFromSrcToDest[*itVec]); |
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| 86 | } |
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| 87 | } |
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| 88 | |
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| 89 | // Inform client about the destination to which it needs to send global indexes |
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| 90 | int nbClient = client->clientSize; |
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| 91 | int* sendBuff = new int[nbClient]; |
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| 92 | int* recvBuff = new int[nbClient]; |
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| 93 | for (int i = 0; i < nbClient; ++i) sendBuff[i] = 0; |
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| 94 | |
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| 95 | // First of all, inform the number of destination a client needs to send global index |
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| 96 | for (itMapSrc = itbMapSrc; itMapSrc != iteMapSrc; ++itMapSrc) sendBuff[itMapSrc->first] = 1; |
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| 97 | MPI_Allreduce(sendBuff, recvBuff, nbClient, MPI_INT, MPI_SUM, client->intraComm); |
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| 98 | int numClientToReceive = recvBuff[client->clientRank]; |
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| 99 | |
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| 100 | // Then specify the size of receiving buffer, because we use synch send/receive so only necessary to know maximum size |
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| 101 | for (itMapSrc = itbMapSrc; itMapSrc != iteMapSrc; ++itMapSrc) sendBuff[itMapSrc->first] = (itMapSrc->second).size(); |
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| 102 | MPI_Allreduce(sendBuff, recvBuff, nbClient, MPI_INT, MPI_MAX, client->intraComm); |
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| 103 | |
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| 104 | int buffSize = recvBuff[client->clientRank]; |
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| 105 | unsigned long* recvBuffGlobalIndex; |
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| 106 | if (0 != buffSize) recvBuffGlobalIndex = new unsigned long [buffSize]; |
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| 107 | |
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| 108 | // Inform all "source clients" about index that they need to send |
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| 109 | for (itMapSrc = itbMapSrc; itMapSrc != iteMapSrc; ++itMapSrc) |
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| 110 | { |
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| 111 | MPI_Request request; |
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| 112 | unsigned long* sendPtr = const_cast<unsigned long*>(&(itMapSrc->second)[0]); |
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| 113 | MPI_Isend(sendPtr, |
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| 114 | (itMapSrc->second).size(), |
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| 115 | MPI_UNSIGNED_LONG, |
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| 116 | itMapSrc->first, |
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| 117 | 11, |
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| 118 | client->intraComm, |
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| 119 | &request); |
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| 120 | } |
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| 121 | |
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| 122 | // Now all the "source clients" try listening messages from other "destination clients" |
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| 123 | int numClientReceived = 0; // number of client to which data has been already sent |
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| 124 | int countBuff; |
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| 125 | while (numClientReceived < numClientToReceive) |
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| 126 | { |
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| 127 | MPI_Status status; |
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| 128 | MPI_Recv(recvBuffGlobalIndex, |
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| 129 | buffSize, |
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| 130 | MPI_UNSIGNED_LONG, |
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| 131 | MPI_ANY_SOURCE, |
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| 132 | 11, |
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| 133 | client->intraComm, |
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| 134 | &status); |
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| 135 | |
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| 136 | MPI_Get_count(&status, MPI_UNSIGNED_LONG, &countBuff); |
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| 137 | int clientDestRank = status.MPI_SOURCE; |
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| 138 | for (int idx = 0; idx < countBuff; ++idx) |
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| 139 | { |
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| 140 | globalIndexSendToGridDestMapping_[clientDestRank].push_back(recvBuffGlobalIndex[idx]); |
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| 141 | } |
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| 142 | ++numClientReceived; |
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| 143 | } |
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| 144 | |
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| 145 | delete [] sendBuff; |
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| 146 | delete [] recvBuff; |
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| 147 | if (0 != buffSize) delete [] recvBuffGlobalIndex; |
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| 148 | } |
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| 149 | |
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| 150 | const std::map<int,std::vector<std::vector<size_t> > >& CTransformationMapping::getGlobalIndexReceivedOnGridDestMapping() const |
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| 151 | { |
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| 152 | return globalIndexReceivedOnGridDestMapping_; |
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| 153 | } |
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| 154 | |
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| 155 | const std::map<int,std::vector<size_t> >& CTransformationMapping::getGlobalIndexSendToGridDestMapping() const |
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| 156 | { |
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| 157 | return globalIndexSendToGridDestMapping_; |
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| 158 | } |
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| 159 | |
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| 160 | } |
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