1 | /*! |
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2 | \file ep_create.cpp |
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3 | \since 2 may 2016 |
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4 | |
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5 | \brief Definitions of MPI endpoint function: MPI_Comm_create_endpoints |
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6 | */ |
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7 | |
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8 | #include "ep_lib.hpp" |
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9 | #include <mpi.h> |
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10 | #include "ep_declaration.hpp" |
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11 | #include "ep_mpi.hpp" |
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12 | |
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13 | using namespace std; |
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14 | |
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15 | namespace ep_lib { |
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16 | |
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17 | int MPI_Comm_create_endpoints(void* base_comm_ptr, int num_ep, MPI_Info info, MPI_Comm *& out_comm_hdls) |
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18 | { |
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19 | |
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20 | int base_rank; |
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21 | int base_size; |
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22 | |
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23 | ::MPI_Comm mpi_base_comm = to_mpi_comm(base_comm_ptr); |
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24 | |
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25 | ::MPI_Comm_size(mpi_base_comm, &base_size); // ep_lib::mpi_comm_size |
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26 | ::MPI_Comm_rank(mpi_base_comm, &base_rank); // ep_lib::mpi_comm_rank |
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27 | // parent_comm can also be endpoints communicators |
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28 | |
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29 | std::vector<int> recv_num_ep(base_size); |
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30 | |
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31 | |
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32 | |
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33 | out_comm_hdls = new MPI_Comm[num_ep]; |
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34 | |
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35 | for (int idx = 0; idx < num_ep; ++idx) |
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36 | { |
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37 | out_comm_hdls[idx].is_ep = true; |
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38 | out_comm_hdls[idx].is_intercomm = false; |
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39 | out_comm_hdls[idx].ep_comm_ptr = new ep_communicator; |
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40 | *(static_cast< ::MPI_Comm*>(out_comm_hdls[idx].mpi_comm)) = *(static_cast< ::MPI_Comm*>(base_comm_ptr)); |
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41 | out_comm_hdls[idx].ep_comm_ptr->comm_list = out_comm_hdls; |
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42 | out_comm_hdls[idx].ep_comm_ptr->comm_label = 0; |
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43 | } |
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44 | |
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45 | ::MPI_Allgather(&num_ep, 1, to_mpi_type(MPI_INT), &recv_num_ep[0], 1, to_mpi_type(MPI_INT), mpi_base_comm); |
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46 | |
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47 | |
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48 | int sum = 0; // representing total ep number of process with smaller rank |
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49 | for (int i = 0; i < base_rank; ++i) {sum += recv_num_ep[i]; } |
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50 | |
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51 | int ep_size = std::accumulate(recv_num_ep.begin(), recv_num_ep.end(), 0); |
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52 | |
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53 | out_comm_hdls[0].ep_barrier = new OMPbarrier(num_ep); |
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54 | out_comm_hdls[0].my_buffer = new BUFFER; |
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55 | |
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56 | out_comm_hdls[0].rank_map = new RANK_MAP; |
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57 | out_comm_hdls[0].rank_map->resize(ep_size); |
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58 | |
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59 | |
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60 | for (int i = 1; i < num_ep; i++) |
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61 | { |
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62 | out_comm_hdls[i].ep_barrier = out_comm_hdls[0].ep_barrier; |
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63 | out_comm_hdls[i].my_buffer = out_comm_hdls[0].my_buffer; |
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64 | out_comm_hdls[i].rank_map = out_comm_hdls[0].rank_map; |
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65 | } |
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66 | |
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67 | |
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68 | for (int i = 0; i < num_ep; i++) |
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69 | { |
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70 | out_comm_hdls[i].ep_comm_ptr->size_rank_info[0] = std::make_pair(sum+i, ep_size); |
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71 | out_comm_hdls[i].ep_comm_ptr->size_rank_info[1] = std::make_pair(i, num_ep); |
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72 | out_comm_hdls[i].ep_comm_ptr->size_rank_info[2] = std::make_pair(base_rank, base_size); |
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73 | |
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74 | out_comm_hdls[i].ep_comm_ptr->message_queue = new Message_list; |
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75 | } |
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76 | |
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77 | |
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78 | int ind = 0; |
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79 | |
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80 | for(int i=0; i<base_size; i++) |
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81 | { |
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82 | for(int j=0; j<recv_num_ep[i]; j++) |
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83 | { |
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84 | out_comm_hdls[0].rank_map->at(ind) = make_pair(j, i); |
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85 | ind++; |
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86 | } |
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87 | } |
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88 | |
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89 | return 0; |
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90 | |
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91 | } //MPI_Comm_create_endpoints |
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92 | |
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93 | |
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94 | } //namespace ep_lib |
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