[1646] | 1 | #ifdef _usingEP |
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[1603] | 2 | /*! |
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| 3 | \file ep_gather.cpp |
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| 4 | \since 2 may 2016 |
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| 5 | |
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| 6 | \brief Definitions of MPI collective function: MPI_Gather, MPI_Allgather |
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| 7 | */ |
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| 8 | |
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| 9 | #include "ep_lib.hpp" |
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| 10 | #include <mpi.h> |
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| 11 | #include "ep_declaration.hpp" |
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| 12 | #include <string.h> |
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| 13 | #include "ep_mpi.hpp" |
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| 14 | |
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| 15 | using namespace std; |
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| 16 | |
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| 17 | namespace ep_lib |
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| 18 | { |
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| 19 | |
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| 20 | int MPI_Allgather_local(const void *sendbuf, int count, MPI_Datatype datatype, void *recvbuf, MPI_Comm comm) |
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| 21 | { |
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| 22 | assert(valid_type(datatype)); |
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| 23 | |
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| 24 | ::MPI_Aint datasize, lb; |
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| 25 | ::MPI_Type_get_extent(to_mpi_type(datatype), &lb, &datasize); |
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| 26 | |
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| 27 | int ep_rank_loc = comm->ep_comm_ptr->size_rank_info[1].first; |
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| 28 | int num_ep = comm->ep_comm_ptr->size_rank_info[1].second; |
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| 29 | |
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| 30 | #pragma omp critical (write_buffer) |
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| 31 | comm->my_buffer->void_buffer[ep_rank_loc] = 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 (read_buffer) |
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| 36 | { |
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| 37 | for(int i=0; i<num_ep; i++) |
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| 38 | memcpy(recvbuf + datasize * i * count, comm->my_buffer->void_buffer[i], datasize * count); |
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| 39 | } |
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| 40 | MPI_Barrier_local(comm); |
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| 41 | } |
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| 42 | |
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| 43 | int MPI_Allgather(const void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf, int recvcount, MPI_Datatype recvtype, MPI_Comm comm) |
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| 44 | { |
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| 45 | |
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| 46 | if(!comm->is_ep) return ::MPI_Allgather(const_cast<void*>(sendbuf), sendcount, to_mpi_type(sendtype), recvbuf, recvcount, to_mpi_type(recvtype), to_mpi_comm(comm->mpi_comm)); |
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| 47 | if(comm->is_intercomm) return MPI_Allgather_intercomm(sendbuf, sendcount, sendtype, recvbuf, recvcount, recvtype, comm); |
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| 48 | |
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| 49 | |
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| 50 | assert(sendcount == recvcount); |
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| 51 | |
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| 52 | assert(valid_type(sendtype) && valid_type(recvtype)); |
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| 53 | |
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| 54 | MPI_Datatype datatype = sendtype; |
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| 55 | int count = sendcount; |
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| 56 | |
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| 57 | ::MPI_Aint datasize, lb; |
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| 58 | |
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| 59 | ::MPI_Type_get_extent(to_mpi_type(datatype), &lb, &datasize); |
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| 60 | |
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| 61 | |
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| 62 | int ep_rank = comm->ep_comm_ptr->size_rank_info[0].first; |
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| 63 | int ep_rank_loc = comm->ep_comm_ptr->size_rank_info[1].first; |
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| 64 | int mpi_rank = comm->ep_comm_ptr->size_rank_info[2].first; |
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| 65 | int ep_size = comm->ep_comm_ptr->size_rank_info[0].second; |
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| 66 | int num_ep = comm->ep_comm_ptr->size_rank_info[1].second; |
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| 67 | int mpi_size = comm->ep_comm_ptr->size_rank_info[2].second; |
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| 68 | |
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| 69 | bool is_master = ep_rank_loc==0; |
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| 70 | |
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| 71 | void* local_recvbuf; |
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| 72 | void* tmp_recvbuf; |
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| 73 | |
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| 74 | |
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| 75 | if(is_master) |
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| 76 | { |
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| 77 | local_recvbuf = new void*[datasize * num_ep * count]; |
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| 78 | tmp_recvbuf = new void*[datasize * count * ep_size]; |
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| 79 | } |
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| 80 | |
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| 81 | MPI_Gather_local(sendbuf, count, datatype, local_recvbuf, 0, comm); |
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| 82 | |
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| 83 | |
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| 84 | int* mpi_recvcounts; |
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| 85 | int *mpi_displs; |
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| 86 | |
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| 87 | if(is_master) |
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| 88 | { |
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| 89 | |
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| 90 | mpi_recvcounts = new int[mpi_size]; |
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| 91 | mpi_displs = new int[mpi_size]; |
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| 92 | |
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| 93 | int local_sendcount = num_ep * count; |
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| 94 | |
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| 95 | ::MPI_Allgather(&local_sendcount, 1, to_mpi_type(MPI_INT), mpi_recvcounts, 1, to_mpi_type(MPI_INT), to_mpi_comm(comm->mpi_comm)); |
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| 96 | |
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| 97 | mpi_displs[0] = 0; |
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| 98 | for(int i=1; i<mpi_size; i++) |
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| 99 | { |
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| 100 | mpi_displs[i] = mpi_displs[i-1] + mpi_recvcounts[i-1]; |
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| 101 | } |
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| 102 | |
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| 103 | |
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| 104 | ::MPI_Allgatherv(local_recvbuf, num_ep * count, to_mpi_type(datatype), tmp_recvbuf, mpi_recvcounts, mpi_displs, to_mpi_type(datatype), to_mpi_comm(comm->mpi_comm)); |
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| 105 | |
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| 106 | |
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| 107 | // reorder |
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| 108 | int offset; |
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| 109 | for(int i=0; i<ep_size; i++) |
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| 110 | { |
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| 111 | offset = mpi_displs[comm->ep_rank_map->at(i).second] + comm->ep_rank_map->at(i).first * sendcount; |
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| 112 | memcpy(recvbuf + i*sendcount*datasize, tmp_recvbuf+offset*datasize, sendcount*datasize); |
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| 113 | } |
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| 114 | |
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| 115 | delete[] mpi_recvcounts; |
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| 116 | delete[] mpi_displs; |
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| 117 | } |
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| 118 | |
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| 119 | MPI_Bcast_local(recvbuf, count*ep_size, datatype, 0, comm); |
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| 120 | |
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| 121 | if(is_master) |
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| 122 | { |
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| 123 | delete[] local_recvbuf; |
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| 124 | delete[] tmp_recvbuf; |
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| 125 | |
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| 126 | } |
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| 127 | |
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| 128 | } |
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| 129 | |
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| 130 | int MPI_Allgather_intercomm(const void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf, int recvcount, MPI_Datatype recvtype, MPI_Comm comm) |
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| 131 | { |
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| 132 | printf("MPI_Allgather_intercomm not yet implemented\n"); |
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| 133 | MPI_Abort(comm, 0); |
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| 134 | } |
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| 135 | |
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| 136 | |
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| 137 | } |
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[1646] | 138 | #endif |
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