1 | /*! |
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2 | \file client_server_mapping.hpp |
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3 | \author Ha NGUYEN |
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4 | \since 04 Feb 2015 |
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5 | \date 09 Mars 2015 |
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6 | |
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7 | \brief Mapping between index client and server. |
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8 | */ |
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9 | #include "client_server_mapping.hpp" |
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10 | |
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11 | namespace xios { |
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12 | |
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13 | CClientServerMapping::CClientServerMapping() |
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14 | : indexGlobalOnServer_() |
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15 | { |
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16 | } |
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17 | |
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18 | CClientServerMapping::~CClientServerMapping() |
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19 | { |
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20 | } |
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21 | |
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22 | /*! |
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23 | Compute how many clients each server will receive data from |
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24 | On client can send data to several servers as well as one server can receive data originated from |
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25 | some clients. In order to write data correctly, each server must know from how many clients it receives data |
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26 | \param [in] nbServer number of servers |
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27 | \param [in] nClient number of clients |
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28 | \param [in] clientIntraComm MPI communication of clients |
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29 | \param [in] connectedServerRank Rank of servers connected to one client |
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30 | */ |
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31 | std::map<int,int> CClientServerMapping::computeConnectedClients(int nbServer, int nbClient, |
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32 | MPI_Comm& clientIntraComm, |
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33 | const std::vector<int>& connectedServerRank) |
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34 | { |
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35 | std::map<int, int> connectedClients; // number of clients connected to a server |
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36 | |
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37 | std::vector<int>::const_iterator itbVec, iteVec, it; |
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38 | itbVec = it = connectedServerRank.begin(); |
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39 | iteVec = connectedServerRank.end(); |
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40 | |
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41 | std::vector<int> connectedServer; |
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42 | std::vector<bool> isConnected(nbServer,false); |
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43 | |
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44 | for (it = itbVec; it != iteVec; ++it) |
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45 | { |
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46 | for (int serverNum = 0; serverNum < nbServer; ++serverNum) |
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47 | if (*it == serverNum) isConnected[serverNum] = true; |
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48 | } |
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49 | |
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50 | for(int serverNum = 0; serverNum<nbServer; ++serverNum) |
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51 | if (isConnected[serverNum]) |
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52 | connectedServer.push_back(serverNum); |
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53 | |
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54 | |
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55 | int nbConnectedServer=connectedServer.size(); |
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56 | int* recvCount=new int[nbClient]; |
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57 | int* displ=new int[nbClient]; |
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58 | int* sendBuff=new int[nbConnectedServer]; |
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59 | valarray<int> clientRes(0,nbServer); |
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60 | |
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61 | for(int n=0;n<nbConnectedServer;n++) sendBuff[n]=connectedServer[n] ; |
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62 | |
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63 | // get connected server for everybody |
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64 | MPI_Allgather(&nbConnectedServer,1,MPI_INT,recvCount,1,MPI_INT,clientIntraComm) ; |
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65 | |
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66 | displ[0]=0 ; |
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67 | for(int n=1;n<nbClient;n++) displ[n]=displ[n-1]+recvCount[n-1] ; |
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68 | int recvSize=displ[nbClient-1]+recvCount[nbClient-1] ; |
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69 | int* recvBuff=new int[recvSize] ; |
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70 | |
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71 | |
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72 | MPI_Allgatherv(sendBuff,nbConnectedServer,MPI_INT,recvBuff,recvCount,displ,MPI_INT,clientIntraComm) ; |
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73 | for(int n=0;n<recvSize;n++) clientRes[recvBuff[n]]++ ; |
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74 | |
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75 | for(int n=0;n<nbConnectedServer;n++) |
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76 | { |
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77 | connectedClients[connectedServer[n]] = clientRes[connectedServer[n]]; |
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78 | } |
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79 | |
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80 | delete [] recvCount ; |
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81 | delete [] displ ; |
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82 | delete [] sendBuff ; |
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83 | delete [] recvBuff ; |
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84 | |
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85 | return connectedClients; |
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86 | } |
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87 | |
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88 | /*! |
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89 | Return global index of data on each connected server. |
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90 | On receiving data sent from client(s), each server with this global index, is able to |
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91 | know where the data should be written. |
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92 | \return mapping of server rank and its global index. |
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93 | */ |
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94 | const CClientServerMapping::GlobalIndexMap& CClientServerMapping::getGlobalIndexOnServer() const |
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95 | { |
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96 | return indexGlobalOnServer_; |
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97 | } |
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98 | |
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99 | } //namespace xios |
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