1 | #include "xios_spl.hpp" |
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2 | #include "context_client.hpp" |
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3 | #include "context_server.hpp" |
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4 | #include "event_client.hpp" |
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5 | #include "buffer_out.hpp" |
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6 | #include "buffer_client.hpp" |
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7 | #include "type.hpp" |
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8 | #include "event_client.hpp" |
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9 | #include "context.hpp" |
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10 | #include "mpi.hpp" |
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11 | #include "timer.hpp" |
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12 | #include "cxios.hpp" |
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13 | #include "server.hpp" |
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14 | #include "services.hpp" |
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15 | #include <boost/functional/hash.hpp> |
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16 | #include <random> |
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17 | #include <chrono> |
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18 | |
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19 | namespace xios |
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20 | { |
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21 | /*! |
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22 | \param [in] parent Pointer to context on client side |
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23 | \param [in] intraComm_ communicator of group client |
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24 | \param [in] interComm_ communicator of group server |
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25 | \cxtSer [in] cxtSer Pointer to context of server side. (It is only used in case of attached mode). |
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26 | */ |
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27 | CContextClient::CContextClient(CContext* parent, MPI_Comm intraComm_, MPI_Comm interComm_, CContext* cxtSer) |
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28 | : mapBufferSize_(), parentServer(cxtSer), maxBufferedEvents(4), associatedServer_(nullptr) |
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29 | { |
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30 | |
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31 | context_ = parent; |
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32 | intraComm = intraComm_; |
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33 | interComm = interComm_; |
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34 | MPI_Comm_rank(intraComm, &clientRank); |
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35 | MPI_Comm_size(intraComm, &clientSize); |
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36 | |
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37 | int flag; |
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38 | MPI_Comm_test_inter(interComm, &flag); |
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39 | if (flag) isAttached_=false ; |
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40 | else isAttached_=true ; |
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41 | |
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42 | pureOneSided=CXios::getin<bool>("pure_one_sided",false); // pure one sided communication (for test) |
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43 | if (isAttachedModeEnabled()) pureOneSided=false ; // no one sided in attach mode |
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44 | |
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45 | |
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46 | |
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47 | if (flag) MPI_Comm_remote_size(interComm, &serverSize); |
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48 | else MPI_Comm_size(interComm, &serverSize); |
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49 | |
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50 | computeLeader(clientRank, clientSize, serverSize, ranksServerLeader, ranksServerNotLeader); |
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51 | |
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52 | if (flag) MPI_Intercomm_merge(interComm_,false, &interCommMerged_) ; |
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53 | |
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54 | MPI_Comm_split(intraComm_,clientRank,clientRank, &commSelf_) ; // for windows |
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55 | |
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56 | auto time=chrono::system_clock::now().time_since_epoch().count() ; |
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57 | std::default_random_engine rd(time); // not reproducible from a run to another |
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58 | std::uniform_int_distribution<size_t> dist; |
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59 | hashId_=dist(rd) ; |
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60 | MPI_Bcast(&hashId_,1,MPI_SIZE_T,0,intraComm) ; // Bcast to all server of the context |
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61 | |
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62 | timeLine = 1; |
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63 | } |
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64 | |
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65 | void CContextClient::computeLeader(int clientRank, int clientSize, int serverSize, |
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66 | std::list<int>& rankRecvLeader, |
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67 | std::list<int>& rankRecvNotLeader) |
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68 | { |
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69 | if ((0 == clientSize) || (0 == serverSize)) return; |
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70 | |
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71 | if (clientSize < serverSize) |
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72 | { |
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73 | int serverByClient = serverSize / clientSize; |
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74 | int remain = serverSize % clientSize; |
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75 | int rankStart = serverByClient * clientRank; |
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76 | |
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77 | if (clientRank < remain) |
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78 | { |
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79 | serverByClient++; |
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80 | rankStart += clientRank; |
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81 | } |
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82 | else |
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83 | rankStart += remain; |
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84 | |
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85 | for (int i = 0; i < serverByClient; i++) |
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86 | rankRecvLeader.push_back(rankStart + i); |
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87 | |
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88 | rankRecvNotLeader.resize(0); |
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89 | } |
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90 | else |
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91 | { |
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92 | int clientByServer = clientSize / serverSize; |
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93 | int remain = clientSize % serverSize; |
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94 | |
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95 | if (clientRank < (clientByServer + 1) * remain) |
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96 | { |
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97 | if (clientRank % (clientByServer + 1) == 0) |
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98 | rankRecvLeader.push_back(clientRank / (clientByServer + 1)); |
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99 | else |
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100 | rankRecvNotLeader.push_back(clientRank / (clientByServer + 1)); |
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101 | } |
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102 | else |
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103 | { |
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104 | int rank = clientRank - (clientByServer + 1) * remain; |
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105 | if (rank % clientByServer == 0) |
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106 | rankRecvLeader.push_back(remain + rank / clientByServer); |
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107 | else |
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108 | rankRecvNotLeader.push_back(remain + rank / clientByServer); |
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109 | } |
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110 | } |
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111 | } |
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112 | |
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113 | /*! |
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114 | In case of attached mode, the current context must be reset to context for client |
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115 | \param [in] event Event sent to server |
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116 | */ |
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117 | void CContextClient::sendEvent(CEventClient& event) |
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118 | { |
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119 | list<int> ranks = event.getRanks(); |
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120 | |
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121 | // ostringstream str ; |
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122 | // for(auto& rank : ranks) str<<rank<<" ; " ; |
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123 | // info(100)<<"Event "<<timeLine<<" of context "<<context_->getId()<<" for ranks : "<<str.str()<<endl ; |
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124 | |
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125 | if (CXios::checkEventSync) |
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126 | { |
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127 | int typeId, classId, typeId_in, classId_in; |
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128 | long long timeLine_out; |
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129 | long long timeLine_in( timeLine ); |
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130 | typeId_in=event.getTypeId() ; |
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131 | classId_in=event.getClassId() ; |
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132 | // MPI_Allreduce(&timeLine,&timeLine_out, 1, MPI_UINT64_T, MPI_SUM, intraComm) ; // MPI_UINT64_T standardized by MPI 3 |
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133 | MPI_Allreduce(&timeLine_in,&timeLine_out, 1, MPI_LONG_LONG_INT, MPI_SUM, intraComm) ; |
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134 | MPI_Allreduce(&typeId_in,&typeId, 1, MPI_INT, MPI_SUM, intraComm) ; |
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135 | MPI_Allreduce(&classId_in,&classId, 1, MPI_INT, MPI_SUM, intraComm) ; |
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136 | if (typeId/clientSize!=event.getTypeId() || classId/clientSize!=event.getClassId() || timeLine_out/clientSize!=timeLine) |
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137 | { |
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138 | ERROR("void CContextClient::sendEvent(CEventClient& event)", |
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139 | << "Event are not coherent between client for timeline = "<<timeLine); |
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140 | } |
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141 | |
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142 | vector<int> servers(serverSize,0) ; |
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143 | auto ranks=event.getRanks() ; |
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144 | for(auto& rank : ranks) servers[rank]=1 ; |
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145 | MPI_Allreduce(MPI_IN_PLACE, servers.data(), serverSize,MPI_INT,MPI_SUM,intraComm) ; |
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146 | ostringstream osstr ; |
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147 | for(int i=0;i<serverSize;i++) if (servers[i]==0) osstr<<i<<" , " ; |
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148 | if (!osstr.str().empty()) |
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149 | { |
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150 | ERROR("void CContextClient::sendEvent(CEventClient& event)", |
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151 | <<" Some servers will not receive the message for timeline = "<<timeLine<<endl |
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152 | <<"Servers are : "<<osstr.str()) ; |
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153 | } |
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154 | |
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155 | |
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156 | } |
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157 | |
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158 | if (!event.isEmpty()) |
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159 | { |
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160 | list<int> sizes = event.getSizes(); |
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161 | |
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162 | // We force the getBuffers call to be non-blocking on classical servers |
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163 | list<CBufferOut*> buffList; |
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164 | getBuffers(timeLine, ranks, sizes, buffList) ; |
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165 | |
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166 | event.send(timeLine, sizes, buffList); |
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167 | |
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168 | //for (auto itRank = ranks.begin(); itRank != ranks.end(); itRank++) buffers[*itRank]->infoBuffer() ; |
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169 | |
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170 | unlockBuffers(ranks) ; |
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171 | checkBuffers(ranks); |
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172 | |
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173 | } |
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174 | |
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175 | if (isAttachedModeEnabled()) // couldBuffer is always true in attached mode |
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176 | { |
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177 | while (checkBuffers(ranks)) callGlobalEventLoop() ; |
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178 | |
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179 | CXios::getDaemonsManager()->scheduleContext(hashId_) ; |
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180 | while (CXios::getDaemonsManager()->isScheduledContext(hashId_)) callGlobalEventLoop() ; |
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181 | } |
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182 | |
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183 | timeLine++; |
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184 | } |
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185 | |
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186 | /*! |
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187 | If client is also server (attached mode), after sending event, it should process right away |
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188 | the incoming event. |
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189 | \param [in] ranks list rank of server connected this client |
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190 | */ |
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191 | void CContextClient::waitEvent(list<int>& ranks) |
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192 | { |
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193 | while (checkBuffers(ranks)) |
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194 | { |
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195 | context_->eventLoop() ; |
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196 | } |
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197 | |
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198 | MPI_Request req ; |
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199 | MPI_Status status ; |
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200 | |
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201 | MPI_Ibarrier(intraComm,&req) ; |
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202 | int flag=false ; |
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203 | |
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204 | do |
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205 | { |
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206 | CXios::getDaemonsManager()->eventLoop() ; |
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207 | MPI_Test(&req,&flag,&status) ; |
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208 | } while (!flag) ; |
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209 | |
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210 | |
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211 | } |
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212 | |
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213 | |
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214 | void CContextClient::waitEvent_old(list<int>& ranks) |
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215 | { |
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216 | parentServer->server->setPendingEvent(); |
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217 | while (checkBuffers(ranks)) |
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218 | { |
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219 | parentServer->server->listen(); |
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220 | parentServer->server->checkPendingRequest(); |
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221 | } |
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222 | |
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223 | while (parentServer->server->hasPendingEvent()) |
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224 | { |
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225 | parentServer->server->eventLoop(); |
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226 | } |
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227 | } |
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228 | |
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229 | /*! |
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230 | * Get buffers for each connection to the servers. This function blocks until there is enough room in the buffers unless |
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231 | * it is explicitly requested to be non-blocking. |
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232 | * |
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233 | * |
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234 | * \param [in] timeLine time line of the event which will be sent to servers |
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235 | * \param [in] serverList list of rank of connected server |
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236 | * \param [in] sizeList size of message corresponding to each connection |
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237 | * \param [out] retBuffers list of buffers that can be used to store an event |
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238 | * \param [in] nonBlocking whether this function should be non-blocking |
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239 | * \return whether the already allocated buffers could be used |
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240 | */ |
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241 | bool CContextClient::getBuffers(const size_t timeLine, const list<int>& serverList, const list<int>& sizeList, list<CBufferOut*>& retBuffers, |
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242 | bool nonBlocking /*= false*/) |
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243 | { |
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244 | list<int>::const_iterator itServer, itSize; |
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245 | list<CClientBuffer*> bufferList; |
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246 | map<int,CClientBuffer*>::const_iterator it; |
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247 | list<CClientBuffer*>::iterator itBuffer; |
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248 | bool areBuffersFree; |
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249 | |
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250 | for (itServer = serverList.begin(); itServer != serverList.end(); itServer++) |
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251 | { |
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252 | it = buffers.find(*itServer); |
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253 | if (it == buffers.end()) |
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254 | { |
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255 | newBuffer(*itServer); |
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256 | it = buffers.find(*itServer); |
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257 | } |
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258 | bufferList.push_back(it->second); |
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259 | } |
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260 | |
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261 | double lastTimeBuffersNotFree=0. ; |
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262 | double time ; |
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263 | bool doUnlockBuffers ; |
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264 | CTimer::get("Blocking time").resume(); |
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265 | do |
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266 | { |
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267 | areBuffersFree = true; |
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268 | doUnlockBuffers=false ; |
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269 | time=MPI_Wtime() ; |
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270 | if (time-lastTimeBuffersNotFree > latency_) |
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271 | { |
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272 | for (itBuffer = bufferList.begin(), itSize = sizeList.begin(); itBuffer != bufferList.end(); itBuffer++, itSize++) |
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273 | { |
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274 | areBuffersFree &= (*itBuffer)->isBufferFree(*itSize); |
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275 | } |
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276 | if (!areBuffersFree) |
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277 | { |
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278 | lastTimeBuffersNotFree = time ; |
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279 | doUnlockBuffers=true ; |
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280 | } |
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281 | } |
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282 | else areBuffersFree = false ; |
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283 | |
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284 | if (!areBuffersFree) |
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285 | { |
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286 | if (doUnlockBuffers) for (itBuffer = bufferList.begin(); itBuffer != bufferList.end(); itBuffer++) (*itBuffer)->unlockBuffer(); |
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287 | checkBuffers(); |
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288 | |
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289 | callGlobalEventLoop() ; |
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290 | } |
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291 | |
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292 | } while (!areBuffersFree && !nonBlocking); |
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293 | CTimer::get("Blocking time").suspend(); |
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294 | |
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295 | if (areBuffersFree) |
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296 | { |
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297 | for (itBuffer = bufferList.begin(), itSize = sizeList.begin(); itBuffer != bufferList.end(); itBuffer++, itSize++) |
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298 | retBuffers.push_back((*itBuffer)->getBuffer(timeLine, *itSize)); |
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299 | } |
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300 | return areBuffersFree; |
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301 | } |
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302 | |
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303 | void CContextClient::eventLoop(void) |
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304 | { |
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305 | if (!locked_) checkBuffers() ; |
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306 | } |
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307 | |
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308 | void CContextClient::callGlobalEventLoop(void) |
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309 | { |
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310 | locked_=true ; |
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311 | context_->globalEventLoop() ; |
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312 | locked_=false ; |
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313 | } |
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314 | /*! |
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315 | Make a new buffer for a certain connection to server with specific rank |
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316 | \param [in] rank rank of connected server |
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317 | */ |
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318 | void CContextClient::newBuffer(int rank) |
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319 | { |
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320 | if (!mapBufferSize_.count(rank)) |
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321 | { |
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322 | error(0) << "WARNING: Unexpected request for buffer to communicate with server " << rank << std::endl; |
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323 | mapBufferSize_[rank] = CXios::minBufferSize; |
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324 | maxEventSizes[rank] = CXios::minBufferSize; |
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325 | } |
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326 | |
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327 | CClientBuffer* buffer = buffers[rank] = new CClientBuffer(interComm, rank, mapBufferSize_[rank], maxEventSizes[rank]); |
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328 | if (isGrowableBuffer_) buffer->setGrowableBuffer(1.2) ; |
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329 | else buffer->fixBuffer() ; |
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330 | // Notify the server |
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331 | CBufferOut* bufOut = buffer->getBuffer(0, 4*sizeof(MPI_Aint)); |
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332 | MPI_Aint sendBuff[4] ; |
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333 | sendBuff[0]=hashId_; |
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334 | sendBuff[1]=mapBufferSize_[rank]; |
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335 | sendBuff[2]=buffers[rank]->getWinAddress(0); |
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336 | sendBuff[3]=buffers[rank]->getWinAddress(1); |
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337 | info(100)<<"CContextClient::newBuffer : rank "<<rank<<" winAdress[0] "<<buffers[rank]->getWinAddress(0)<<" winAdress[1] "<<buffers[rank]->getWinAddress(1)<<endl; |
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338 | bufOut->put(sendBuff, 4); |
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339 | buffer->checkBuffer(true); |
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340 | |
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341 | // create windows dynamically for one-sided |
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342 | if (!isAttachedModeEnabled()) |
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343 | { |
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344 | CTimer::get("create Windows").resume() ; |
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345 | MPI_Comm interComm ; |
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346 | MPI_Intercomm_create(commSelf_, 0, interCommMerged_, clientSize+rank, 0, &interComm) ; |
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347 | MPI_Intercomm_merge(interComm, false, &winComm_[rank]) ; |
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348 | CXios::getMpiGarbageCollector().registerCommunicator(winComm_[rank]) ; |
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349 | MPI_Comm_free(&interComm) ; |
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350 | windows_[rank].resize(2) ; |
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351 | |
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352 | MPI_Win_create_dynamic(MPI_INFO_NULL, winComm_[rank], &windows_[rank][0]); |
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353 | CXios::getMpiGarbageCollector().registerWindow(windows_[rank][0]) ; |
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354 | |
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355 | MPI_Win_create_dynamic(MPI_INFO_NULL, winComm_[rank], &windows_[rank][1]); |
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356 | CXios::getMpiGarbageCollector().registerWindow(windows_[rank][1]) ; |
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357 | |
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358 | CTimer::get("create Windows").suspend() ; |
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359 | } |
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360 | else |
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361 | { |
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362 | winComm_[rank] = MPI_COMM_NULL ; |
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363 | windows_[rank].resize(2) ; |
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364 | windows_[rank][0] = MPI_WIN_NULL ; |
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365 | windows_[rank][1] = MPI_WIN_NULL ; |
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366 | } |
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367 | buffer->attachWindows(windows_[rank]) ; |
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368 | if (!isAttachedModeEnabled()) MPI_Barrier(winComm_[rank]) ; |
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369 | |
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370 | } |
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371 | |
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372 | /*! |
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373 | Verify state of buffers. Buffer is under pending state if there is no message on it |
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374 | \return state of buffers, pending(true), ready(false) |
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375 | */ |
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376 | bool CContextClient::checkBuffers(void) |
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377 | { |
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378 | map<int,CClientBuffer*>::iterator itBuff; |
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379 | bool pending = false; |
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380 | for (itBuff = buffers.begin(); itBuff != buffers.end(); itBuff++) |
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381 | pending |= itBuff->second->checkBuffer(!pureOneSided); |
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382 | return pending; |
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383 | } |
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384 | |
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385 | //! Release all buffers |
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386 | void CContextClient::releaseBuffers() |
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387 | { |
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388 | map<int,CClientBuffer*>::iterator itBuff; |
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389 | for (itBuff = buffers.begin(); itBuff != buffers.end(); itBuff++) |
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390 | { |
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391 | delete itBuff->second; |
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392 | } |
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393 | buffers.clear(); |
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394 | |
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395 | // don't know when release windows |
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396 | |
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397 | //if (!isAttachedModeEnabled()) |
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398 | //{ |
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399 | // for(auto& it : winComm_) |
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400 | // { |
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401 | // int rank = it.first ; |
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402 | // MPI_Win_free(&windows_[rank][0]); |
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403 | // MPI_Win_free(&windows_[rank][1]); |
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404 | // MPI_Comm_free(&winComm_[rank]) ; |
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405 | // } |
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406 | //} |
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407 | } |
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408 | |
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409 | |
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410 | /*! |
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411 | Lock the buffers for one sided communications |
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412 | \param [in] ranks list rank of server to which client connects to |
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413 | */ |
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414 | void CContextClient::lockBuffers(list<int>& ranks) |
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415 | { |
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416 | list<int>::iterator it; |
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417 | for (it = ranks.begin(); it != ranks.end(); it++) buffers[*it]->lockBuffer(); |
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418 | } |
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419 | |
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420 | /*! |
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421 | Unlock the buffers for one sided communications |
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422 | \param [in] ranks list rank of server to which client connects to |
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423 | */ |
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424 | void CContextClient::unlockBuffers(list<int>& ranks) |
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425 | { |
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426 | list<int>::iterator it; |
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427 | for (it = ranks.begin(); it != ranks.end(); it++) buffers[*it]->unlockBuffer(); |
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428 | } |
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429 | |
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430 | /*! |
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431 | Verify state of buffers corresponding to a connection |
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432 | \param [in] ranks list rank of server to which client connects to |
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433 | \return state of buffers, pending(true), ready(false) |
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434 | */ |
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435 | bool CContextClient::checkBuffers(list<int>& ranks) |
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436 | { |
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437 | list<int>::iterator it; |
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438 | bool pending = false; |
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439 | for (it = ranks.begin(); it != ranks.end(); it++) pending |= buffers[*it]->checkBuffer(!pureOneSided); |
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440 | return pending; |
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441 | } |
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442 | |
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443 | /*! |
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444 | * Set the buffer size for each connection. Warning: This function is collective. |
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445 | * |
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446 | * \param [in] mapSize maps the rank of the connected servers to the size of the correspoinding buffer |
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447 | * \param [in] maxEventSize maps the rank of the connected servers to the size of the biggest event |
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448 | */ |
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449 | void CContextClient::setBufferSize(const std::map<int,StdSize>& mapSize) |
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450 | { |
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451 | setFixedBuffer() ; |
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452 | for(auto& it : mapSize) |
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453 | { |
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454 | size_t size=std::max(CXios::minBufferSize*1.0,std::min(it.second*CXios::bufferSizeFactor*1.01,CXios::maxBufferSize*1.0)) ; |
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455 | mapBufferSize_[it.first]=size ; |
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456 | if (buffers.count(it.first)>0) buffers[it.first]->fixBufferSize(size); |
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457 | } |
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458 | } |
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459 | |
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460 | /*! |
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461 | Get leading server in the group of connected server |
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462 | \return ranks of leading servers |
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463 | */ |
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464 | const std::list<int>& CContextClient::getRanksServerNotLeader(void) const |
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465 | { |
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466 | return ranksServerNotLeader; |
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467 | } |
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468 | |
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469 | /*! |
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470 | Check if client connects to leading server |
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471 | \return connected(true), not connected (false) |
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472 | */ |
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473 | bool CContextClient::isServerNotLeader(void) const |
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474 | { |
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475 | return !ranksServerNotLeader.empty(); |
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476 | } |
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477 | |
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478 | /*! |
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479 | Get leading server in the group of connected server |
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480 | \return ranks of leading servers |
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481 | */ |
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482 | const std::list<int>& CContextClient::getRanksServerLeader(void) const |
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483 | { |
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484 | return ranksServerLeader; |
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485 | } |
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486 | |
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487 | /*! |
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488 | Check if client connects to leading server |
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489 | \return connected(true), not connected (false) |
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490 | */ |
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491 | bool CContextClient::isServerLeader(void) const |
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492 | { |
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493 | return !ranksServerLeader.empty(); |
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494 | } |
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495 | |
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496 | /*! |
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497 | * Finalize context client and do some reports. Function is non-blocking. |
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498 | */ |
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499 | void CContextClient::finalize(void) |
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500 | { |
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501 | map<int,CClientBuffer*>::iterator itBuff; |
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502 | std::list<int>::iterator ItServerLeader; |
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503 | |
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504 | bool stop = false; |
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505 | |
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506 | int* nbServerConnectionLocal = new int[serverSize] ; |
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507 | int* nbServerConnectionGlobal = new int[serverSize] ; |
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508 | for(int i=0;i<serverSize;++i) nbServerConnectionLocal[i]=0 ; |
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509 | for (itBuff = buffers.begin(); itBuff != buffers.end(); itBuff++) nbServerConnectionLocal[itBuff->first]=1 ; |
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510 | for (ItServerLeader = ranksServerLeader.begin(); ItServerLeader != ranksServerLeader.end(); ItServerLeader++) nbServerConnectionLocal[*ItServerLeader]=1 ; |
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511 | |
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512 | MPI_Allreduce(nbServerConnectionLocal, nbServerConnectionGlobal, serverSize, MPI_INT, MPI_SUM, intraComm); |
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513 | |
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514 | CEventClient event(CContext::GetType(), CContext::EVENT_ID_CONTEXT_FINALIZE); |
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515 | CMessage msg; |
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516 | |
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517 | for (int i=0;i<serverSize;++i) if (nbServerConnectionLocal[i]==1) event.push(i, nbServerConnectionGlobal[i], msg) ; |
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518 | sendEvent(event); |
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519 | |
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520 | delete[] nbServerConnectionLocal ; |
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521 | delete[] nbServerConnectionGlobal ; |
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522 | |
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523 | |
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524 | CTimer::get("Blocking time").resume(); |
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525 | checkBuffers(); |
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526 | CTimer::get("Blocking time").suspend(); |
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527 | |
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528 | std::map<int,StdSize>::const_iterator itbMap = mapBufferSize_.begin(), |
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529 | iteMap = mapBufferSize_.end(), itMap; |
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530 | |
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531 | StdSize totalBuf = 0; |
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532 | for (itMap = itbMap; itMap != iteMap; ++itMap) |
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533 | { |
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534 | report(10) << " Memory report : Context <" << context_->getId() << "> : client side : memory used for buffer of each connection to server" << endl |
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535 | << " +) To server with rank " << itMap->first << " : " << itMap->second << " bytes " << endl; |
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536 | totalBuf += itMap->second; |
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537 | } |
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538 | report(0) << " Memory report : Context <" << context_->getId() << "> : client side : total memory used for buffer " << totalBuf << " bytes" << endl; |
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539 | |
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540 | } |
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541 | |
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542 | |
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543 | /*! |
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544 | */ |
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545 | bool CContextClient::havePendingRequests(void) |
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546 | { |
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547 | bool pending = false; |
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548 | map<int,CClientBuffer*>::iterator itBuff; |
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549 | for (itBuff = buffers.begin(); itBuff != buffers.end(); itBuff++) |
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550 | pending |= itBuff->second->hasPendingRequest(); |
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551 | return pending; |
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552 | } |
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553 | |
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554 | bool CContextClient::havePendingRequests(list<int>& ranks) |
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555 | { |
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556 | list<int>::iterator it; |
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557 | bool pending = false; |
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558 | for (it = ranks.begin(); it != ranks.end(); it++) pending |= buffers[*it]->hasPendingRequest(); |
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559 | return pending; |
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560 | } |
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561 | |
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562 | bool CContextClient::isNotifiedFinalized(void) |
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563 | { |
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564 | if (isAttachedModeEnabled()) return true ; |
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565 | |
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566 | bool finalized = true; |
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567 | map<int,CClientBuffer*>::iterator itBuff; |
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568 | for (itBuff = buffers.begin(); itBuff != buffers.end(); itBuff++) |
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569 | finalized &= itBuff->second->isNotifiedFinalized(); |
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570 | return finalized; |
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571 | } |
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572 | |
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573 | } |
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