1 | /*! |
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2 | \file ep_gather.cpp |
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3 | \since 2 may 2016 |
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4 | |
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5 | \brief Definitions of MPI collective function: MPI_Scatter |
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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 | |
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18 | int MPI_Scatter_local(void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf, int recvcount, MPI_Datatype recvtype, int local_root, MPI_Comm comm) |
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19 | { |
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20 | assert(valid_type(sendtype) && valid_type(recvtype)); |
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21 | assert(recvcount == sendcount); |
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22 | |
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23 | ::MPI_Aint datasize, lb; |
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24 | ::MPI_Type_get_extent(to_mpi_type(sendtype), &lb, &datasize); |
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25 | |
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26 | int ep_rank_loc = comm->ep_comm_ptr->size_rank_info[1].first; |
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27 | int num_ep = comm->ep_comm_ptr->size_rank_info[1].second; |
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28 | |
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29 | |
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30 | if(ep_rank_loc == local_root) |
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31 | comm->my_buffer->void_buffer[local_root] = const_cast<void*>(sendbuf); |
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32 | |
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33 | MPI_Barrier_local(comm); |
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34 | |
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35 | #pragma omp critical (_scatter) |
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36 | memcpy(recvbuf, comm->my_buffer->void_buffer[local_root]+datasize*ep_rank_loc*sendcount, datasize * recvcount); |
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37 | |
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38 | |
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39 | MPI_Barrier_local(comm); |
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40 | } |
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41 | |
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42 | int MPI_Scatter(const void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf, int recvcount, MPI_Datatype recvtype, int root, MPI_Comm comm) |
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43 | { |
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44 | if(!comm->is_ep) return ::MPI_Scatter(sendbuf, sendcount, to_mpi_type(sendtype), recvbuf, recvcount, to_mpi_type(recvtype), root, to_mpi_comm(comm->mpi_comm)); |
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45 | if(comm->is_intercomm) return MPI_Scatter_intercomm(sendbuf, sendcount, sendtype, recvbuf, recvcount, recvtype, root, comm); |
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46 | |
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47 | assert(sendcount == recvcount); |
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48 | |
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49 | int ep_rank = comm->ep_comm_ptr->size_rank_info[0].first; |
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50 | int ep_rank_loc = comm->ep_comm_ptr->size_rank_info[1].first; |
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51 | int mpi_rank = comm->ep_comm_ptr->size_rank_info[2].first; |
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52 | int ep_size = comm->ep_comm_ptr->size_rank_info[0].second; |
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53 | int num_ep = comm->ep_comm_ptr->size_rank_info[1].second; |
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54 | int mpi_size = comm->ep_comm_ptr->size_rank_info[2].second; |
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55 | |
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56 | int root_mpi_rank = comm->ep_rank_map->at(root).second; |
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57 | int root_ep_loc = comm->ep_rank_map->at(root).first; |
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58 | |
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59 | bool is_master = (ep_rank_loc==0 && mpi_rank != root_mpi_rank ) || ep_rank == root; |
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60 | bool is_root = ep_rank == root; |
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61 | |
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62 | MPI_Datatype datatype = sendtype; |
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63 | int count = sendcount; |
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64 | |
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65 | ::MPI_Aint datasize, lb; |
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66 | ::MPI_Type_get_extent(to_mpi_type(datatype), &lb, &datasize); |
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67 | |
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68 | void *tmp_sendbuf; |
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69 | if(is_root) tmp_sendbuf = new void*[ep_size * count * datasize]; |
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70 | |
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71 | // reorder tmp_sendbuf |
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72 | std::vector<int>local_ranks(num_ep); |
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73 | std::vector<int>ranks(ep_size); |
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74 | |
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75 | if(mpi_rank == root_mpi_rank) MPI_Gather_local(&ep_rank, 1, MPI_INT, local_ranks.data(), root_ep_loc, comm); |
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76 | else MPI_Gather_local(&ep_rank, 1, MPI_INT, local_ranks.data(), 0, comm); |
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77 | |
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78 | |
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79 | std::vector<int> recvcounts(mpi_size, 0); |
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80 | std::vector<int> displs(mpi_size, 0); |
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81 | |
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82 | |
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83 | if(is_master) |
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84 | { |
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85 | for(int i=0; i<ep_size; i++) |
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86 | { |
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87 | recvcounts[comm->ep_rank_map->at(i).second]++; |
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88 | } |
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89 | |
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90 | for(int i=1; i<mpi_size; i++) |
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91 | displs[i] = displs[i-1] + recvcounts[i-1]; |
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92 | |
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93 | ::MPI_Gatherv(local_ranks.data(), num_ep, to_mpi_type(MPI_INT), ranks.data(), recvcounts.data(), displs.data(), to_mpi_type(MPI_INT), root_mpi_rank, to_mpi_comm(comm->mpi_comm)); |
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94 | } |
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95 | |
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96 | |
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97 | if(is_root) |
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98 | for(int i=0; i<ep_size; i++) |
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99 | { |
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100 | memcpy(tmp_sendbuf + i*datasize*count, sendbuf + ranks[i]*datasize*count, count*datasize); |
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101 | } |
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102 | |
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103 | // MPI_Scatterv from root to masters |
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104 | void* local_recvbuf; |
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105 | if(is_master) local_recvbuf = new void*[datasize * num_ep * count]; |
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106 | |
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107 | |
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108 | if(is_master) |
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109 | { |
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110 | int local_sendcount = num_ep * count; |
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111 | ::MPI_Gather(&local_sendcount, 1, to_mpi_type(MPI_INT), recvcounts.data(), 1, to_mpi_type(MPI_INT), root_mpi_rank, to_mpi_comm(comm->mpi_comm)); |
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112 | |
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113 | if(is_root) for(int i=1; i<mpi_size; i++) displs[i] = displs[i-1] + recvcounts[i-1]; |
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114 | |
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115 | ::MPI_Scatterv(tmp_sendbuf, recvcounts.data(), displs.data(), to_mpi_type(sendtype), local_recvbuf, num_ep*count, to_mpi_type(recvtype), root_mpi_rank, to_mpi_comm(comm->mpi_comm)); |
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116 | |
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117 | } |
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118 | |
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119 | if(mpi_rank == root_mpi_rank) MPI_Scatter_local(local_recvbuf, count, sendtype, recvbuf, recvcount, recvtype, root_ep_loc, comm); |
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120 | else MPI_Scatter_local(local_recvbuf, count, sendtype, recvbuf, recvcount, recvtype, 0, comm); |
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121 | |
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122 | if(is_root) delete[] tmp_sendbuf; |
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123 | if(is_master) delete[] local_recvbuf; |
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124 | } |
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125 | |
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126 | |
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127 | int MPI_Scatter_intercomm(const void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf, int recvcount, MPI_Datatype recvtype, int root, MPI_Comm comm) |
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128 | { |
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129 | printf("MPI_Scatter_intercomm not yet implemented\n"); |
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130 | MPI_Abort(comm, 0); |
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131 | } |
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132 | |
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133 | } |
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