[1604] | 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_Gatherv, MPI_Allgatherv |
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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 | |
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| 14 | using namespace std; |
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| 15 | |
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| 16 | namespace ep_lib |
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| 17 | { |
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| 18 | |
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| 19 | int MPI_Allgatherv(const void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf, const int recvcounts[], const int displs[], MPI_Datatype recvtype, MPI_Comm comm) |
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| 20 | { |
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| 21 | |
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| 22 | if(!comm->is_ep) return ::MPI_Allgatherv(sendbuf, sendcount, to_mpi_type(sendtype), recvbuf, recvcounts, displs, to_mpi_type(recvtype), to_mpi_comm(comm->mpi_comm)); |
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| 23 | if(comm->is_intercomm) return MPI_Allgatherv_intercomm(sendbuf, sendcount, sendtype, recvbuf, recvcounts, displs, recvtype, comm); |
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| 24 | |
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| 25 | |
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| 26 | assert(valid_type(sendtype) && valid_type(recvtype)); |
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| 27 | |
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| 28 | MPI_Datatype datatype = sendtype; |
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| 29 | int count = sendcount; |
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| 30 | |
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| 31 | ::MPI_Aint datasize, lb; |
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| 32 | |
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| 33 | ::MPI_Type_get_extent(to_mpi_type(datatype), &lb, &datasize); |
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| 34 | |
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| 35 | |
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| 36 | int ep_rank = comm->ep_comm_ptr->size_rank_info[0].first; |
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| 37 | int ep_rank_loc = comm->ep_comm_ptr->size_rank_info[1].first; |
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| 38 | int mpi_rank = comm->ep_comm_ptr->size_rank_info[2].first; |
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| 39 | int ep_size = comm->ep_comm_ptr->size_rank_info[0].second; |
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| 40 | int num_ep = comm->ep_comm_ptr->size_rank_info[1].second; |
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| 41 | int mpi_size = comm->ep_comm_ptr->size_rank_info[2].second; |
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| 42 | |
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| 43 | assert(sendcount == recvcounts[ep_rank]); |
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| 44 | |
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| 45 | bool is_master = ep_rank_loc==0; |
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| 46 | |
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| 47 | void* local_recvbuf; |
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| 48 | void* tmp_recvbuf; |
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| 49 | |
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| 50 | int recvbuf_size = 0; |
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| 51 | for(int i=0; i<ep_size; i++) |
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| 52 | recvbuf_size = max(recvbuf_size, displs[i]+recvcounts[i]); |
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| 53 | |
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| 54 | |
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| 55 | vector<int>local_recvcounts(num_ep, 0); |
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| 56 | vector<int>local_displs(num_ep, 0); |
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| 57 | |
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| 58 | MPI_Gather_local(&sendcount, 1, MPI_INT, local_recvcounts.data(), 0, comm); |
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| 59 | for(int i=1; i<num_ep; i++) local_displs[i] = local_displs[i-1] + local_recvcounts[i-1]; |
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| 60 | |
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| 61 | |
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| 62 | if(is_master) |
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| 63 | { |
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| 64 | local_recvbuf = new void*[datasize * std::accumulate(local_recvcounts.begin(), local_recvcounts.end(), 0)]; |
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| 65 | tmp_recvbuf = new void*[datasize * std::accumulate(recvcounts, recvcounts+ep_size, 0)]; |
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| 66 | } |
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| 67 | |
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| 68 | MPI_Gatherv_local(sendbuf, count, datatype, local_recvbuf, local_recvcounts.data(), local_displs.data(), 0, comm); |
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| 69 | |
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| 70 | |
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| 71 | if(is_master) |
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| 72 | { |
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| 73 | std::vector<int>mpi_recvcounts(mpi_size, 0); |
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| 74 | std::vector<int>mpi_displs(mpi_size, 0); |
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| 75 | |
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| 76 | int local_sendcount = std::accumulate(local_recvcounts.begin(), local_recvcounts.end(), 0); |
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| 77 | ::MPI_Allgather(&local_sendcount, 1, to_mpi_type(MPI_INT), mpi_recvcounts.data(), 1, to_mpi_type(MPI_INT), to_mpi_comm(comm->mpi_comm)); |
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| 78 | |
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| 79 | for(int i=1; i<mpi_size; i++) |
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| 80 | mpi_displs[i] = mpi_displs[i-1] + mpi_recvcounts[i-1]; |
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| 81 | |
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| 82 | |
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| 83 | ::MPI_Allgatherv(local_recvbuf, local_sendcount, to_mpi_type(datatype), tmp_recvbuf, mpi_recvcounts.data(), mpi_displs.data(), to_mpi_type(datatype), to_mpi_comm(comm->mpi_comm)); |
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| 84 | |
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| 85 | // reorder |
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| 86 | int offset; |
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| 87 | for(int i=0; i<ep_size; i++) |
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| 88 | { |
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| 89 | int extra = 0; |
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| 90 | for(int j=0, k=0; j<ep_size, k<comm->ep_rank_map->at(i).first; j++) |
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| 91 | if(comm->ep_rank_map->at(i).second == comm->ep_rank_map->at(j).second) |
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| 92 | { |
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| 93 | extra += recvcounts[j]; |
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| 94 | k++; |
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| 95 | } |
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| 96 | |
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| 97 | offset = mpi_displs[comm->ep_rank_map->at(i).second] + extra; |
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| 98 | |
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| 99 | memcpy(recvbuf+displs[i]*datasize, tmp_recvbuf+offset*datasize, recvcounts[i]*datasize); |
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| 100 | |
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| 101 | } |
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| 102 | |
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| 103 | } |
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| 104 | |
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| 105 | MPI_Bcast_local(recvbuf, recvbuf_size, datatype, 0, comm); |
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| 106 | |
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| 107 | if(is_master) |
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| 108 | { |
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| 109 | delete[] local_recvbuf; |
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| 110 | delete[] tmp_recvbuf; |
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| 111 | } |
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| 112 | } |
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| 113 | |
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| 114 | |
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| 115 | int MPI_Allgatherv_intercomm(const void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf, const int recvcounts[], const int displs[], MPI_Datatype recvtype, MPI_Comm comm) |
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| 116 | { |
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| 117 | printf("MPI_Allgatherv_intercomm not yet implemented\n"); |
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| 118 | MPI_Abort(comm, 0); |
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| 119 | } |
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| 120 | |
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| 121 | |
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| 122 | } |
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