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_(), localIndexSend2Server_(), connectedClients_() |
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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 mapping global index of server which client sends to. |
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24 | \param [in] globalIndexOnClient global index on client |
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25 | \param [in] globalIndexServer global index of servers |
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26 | */ |
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27 | void CClientServerMapping::computeServerIndexMapping(const CArray<size_t,1>& globalIndexOnClient, |
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28 | const std::vector<CArray<size_t,1>* >& globalIndexServer) |
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29 | { |
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30 | defaultComputeServerIndexMapping(globalIndexOnClient, globalIndexServer); |
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31 | } |
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32 | |
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33 | /*! |
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34 | Compute index of data which are sent to server and index global on server side |
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35 | \param [in] globalIndexOnClient global index of data on client |
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36 | \param [in] globalIndexServer global index of server(s) |
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37 | \param [in] localIndexOnClient local index of data on client which are sent to server |
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38 | */ |
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39 | void CClientServerMapping::defaultComputeServerIndexMapping(const CArray<size_t,1>& globalIndexOnClient, |
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40 | const std::vector<CArray<size_t,1>* >& globalIndexServer, |
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41 | const CArray<int,1>* localIndexOnClient) |
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42 | { |
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43 | int nServer = globalIndexServer.size(); |
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44 | std::vector<CArray<size_t,1>::const_iterator> itBegin(nServer), itEnd(nServer), it(nServer); |
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45 | for (int i = 0; i < nServer; ++i) |
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46 | { |
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47 | itBegin[i] = it[i] = globalIndexServer[i]->begin(); |
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48 | itEnd[i] = globalIndexServer[i]->end(); |
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49 | } |
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50 | |
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51 | size_t ssize = globalIndexOnClient.numElements(); |
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52 | for (int i = 0; i < ssize; ++i) |
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53 | { |
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54 | for (int j = 0; j < nServer; ++j) |
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55 | { |
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56 | // Just temporarily, it's bad. |
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57 | if (std::binary_search(itBegin[j], itEnd[j], globalIndexOnClient(i))) |
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58 | { |
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59 | // Just try to calculate local index server on client side |
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60 | (indexGlobalOnServer_[j]).push_back((globalIndexOnClient)(i)); |
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61 | if (0 != localIndexOnClient) (localIndexSend2Server_[j]).push_back((*localIndexOnClient)(i)); |
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62 | else |
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63 | (localIndexSend2Server_[j]).push_back(i); |
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64 | continue; |
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65 | } |
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66 | } |
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67 | } |
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68 | } |
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69 | |
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70 | /*! |
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71 | Compute how many clients each server will receive data from |
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72 | On client can send data to several servers as well as one server can receive data originated from |
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73 | some clients. In order to write data correctly, each server must know from how many clients it receives data |
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74 | \param [in] nbServer number of servers |
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75 | \param [in] nClient number of clients |
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76 | \param [in] clientIntraComm MPI communication of clients |
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77 | \param [in] connectedServerRank Rank of servers connected to one client |
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78 | */ |
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79 | std::map<int,int> CClientServerMapping::computeConnectedClients(int nbServer, int nbClient, |
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80 | MPI_Comm& clientIntraComm, |
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81 | const std::vector<int>& connectedServerRank) |
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82 | { |
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83 | std::map<int, int> connectedClients; // number of clients connected to a server |
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84 | |
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85 | std::vector<int>::const_iterator itbVec, iteVec, it; |
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86 | itbVec = it = connectedServerRank.begin(); |
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87 | iteVec = connectedServerRank.end(); |
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88 | |
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89 | std::vector<int> connectedServer; |
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90 | std::vector<bool> isConnected(nbServer,false); |
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91 | |
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92 | for (it = itbVec; it != iteVec; ++it) |
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93 | { |
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94 | for (int serverNum = 0; serverNum < nbServer; ++serverNum) |
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95 | if (*it == serverNum) isConnected[serverNum] = true; |
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96 | } |
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97 | |
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98 | for(int serverNum = 0; serverNum<nbServer; ++serverNum) |
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99 | if (isConnected[serverNum]) |
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100 | connectedServer.push_back(serverNum); |
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101 | |
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102 | |
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103 | int nbConnectedServer=connectedServer.size(); |
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104 | int* recvCount=new int[nbClient]; |
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105 | int* displ=new int[nbClient]; |
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106 | int* sendBuff=new int[nbConnectedServer]; |
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107 | valarray<int> clientRes(0,nbServer); |
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108 | |
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109 | for(int n=0;n<nbConnectedServer;n++) sendBuff[n]=connectedServer[n] ; |
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110 | |
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111 | // get connected server for everybody |
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112 | MPI_Allgather(&nbConnectedServer,1,MPI_INT,recvCount,1,MPI_INT,clientIntraComm) ; |
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113 | |
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114 | displ[0]=0 ; |
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115 | for(int n=1;n<nbClient;n++) displ[n]=displ[n-1]+recvCount[n-1] ; |
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116 | int recvSize=displ[nbClient-1]+recvCount[nbClient-1] ; |
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117 | int* recvBuff=new int[recvSize] ; |
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118 | |
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119 | |
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120 | MPI_Allgatherv(sendBuff,nbConnectedServer,MPI_INT,recvBuff,recvCount,displ,MPI_INT,clientIntraComm) ; |
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121 | for(int n=0;n<recvSize;n++) clientRes[recvBuff[n]]++ ; |
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122 | |
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123 | for(int n=0;n<nbConnectedServer;n++) |
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124 | { |
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125 | connectedClients[connectedServer[n]] = clientRes[connectedServer[n]]; |
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126 | } |
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127 | |
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128 | delete [] recvCount ; |
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129 | delete [] displ ; |
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130 | delete [] sendBuff ; |
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131 | delete [] recvBuff ; |
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132 | |
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133 | return connectedClients; |
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134 | } |
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135 | |
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136 | /*! |
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137 | Return local index of data that is send to server |
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138 | \return mapping of server rank and local index of sending data on the client |
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139 | */ |
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140 | const std::map<int, std::vector<int> >& CClientServerMapping::getLocalIndexSendToServer() const |
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141 | { |
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142 | return localIndexSend2Server_; |
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143 | } |
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144 | |
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145 | /*! |
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146 | Return global index of data on each connected server. |
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147 | On receiving data sent from client(s), each server with this global index, is able to |
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148 | know where the data should be written. |
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149 | \return mapping of server rank and its global index. |
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150 | */ |
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151 | const std::map<int, std::vector<size_t> >& CClientServerMapping::getGlobalIndexOnServer() const |
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152 | { |
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153 | return indexGlobalOnServer_; |
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154 | } |
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155 | |
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156 | } //namespace xios |
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