[1381] | 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_Gather, MPI_Allgather |
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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 <string.h> |
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| 12 | #include "ep_mpi.hpp" |
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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_Allgather(const void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf, int recvcount, MPI_Datatype recvtype, MPI_Comm comm) |
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| 20 | { |
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| 21 | |
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[1500] | 22 | if(!comm->is_ep && comm->mpi_comm) |
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[1381] | 23 | { |
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[1500] | 24 | 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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[1381] | 25 | } |
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| 26 | |
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| 27 | assert(sendcount == recvcount); |
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| 28 | |
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| 29 | assert(valid_type(sendtype) && valid_type(recvtype)); |
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| 30 | |
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| 31 | MPI_Datatype datatype = sendtype; |
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| 32 | int count = sendcount; |
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| 33 | |
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| 34 | ::MPI_Aint datasize, lb; |
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| 35 | |
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| 36 | ::MPI_Type_get_extent(to_mpi_type(datatype), &lb, &datasize); |
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| 37 | |
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| 38 | |
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[1500] | 39 | int ep_rank = comm->ep_comm_ptr->size_rank_info[0].first; |
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| 40 | int ep_rank_loc = comm->ep_comm_ptr->size_rank_info[1].first; |
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| 41 | int mpi_rank = comm->ep_comm_ptr->size_rank_info[2].first; |
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| 42 | int ep_size = comm->ep_comm_ptr->size_rank_info[0].second; |
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| 43 | int num_ep = comm->ep_comm_ptr->size_rank_info[1].second; |
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| 44 | int mpi_size = comm->ep_comm_ptr->size_rank_info[2].second; |
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[1381] | 45 | |
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| 46 | bool is_master = ep_rank_loc==0; |
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| 47 | |
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| 48 | void* local_recvbuf; |
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| 49 | void* tmp_recvbuf; |
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| 50 | |
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| 51 | |
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| 52 | if(is_master) |
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| 53 | { |
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| 54 | local_recvbuf = new void*[datasize * num_ep * count]; |
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| 55 | tmp_recvbuf = new void*[datasize * count * ep_size]; |
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| 56 | } |
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| 57 | |
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| 58 | MPI_Gather_local(sendbuf, count, datatype, local_recvbuf, 0, comm); |
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| 59 | |
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| 60 | |
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| 61 | int* mpi_recvcounts; |
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| 62 | int *mpi_displs; |
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| 63 | |
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| 64 | if(is_master) |
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| 65 | { |
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| 66 | |
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| 67 | mpi_recvcounts = new int[mpi_size]; |
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| 68 | mpi_displs = new int[mpi_size]; |
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| 69 | |
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| 70 | int local_sendcount = num_ep * count; |
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| 71 | |
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[1500] | 72 | ::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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[1381] | 73 | |
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| 74 | mpi_displs[0] = 0; |
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| 75 | for(int i=1; i<mpi_size; i++) |
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| 76 | { |
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| 77 | mpi_displs[i] = mpi_displs[i-1] + mpi_recvcounts[i-1]; |
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| 78 | } |
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| 79 | |
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| 80 | |
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[1500] | 81 | ::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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[1381] | 82 | |
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| 83 | |
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| 84 | // reorder |
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| 85 | int offset; |
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| 86 | for(int i=0; i<ep_size; i++) |
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| 87 | { |
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[1500] | 88 | offset = mpi_displs[comm->rank_map->at(i).second] + comm->rank_map->at(i).first * sendcount; |
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[1381] | 89 | memcpy(recvbuf + i*sendcount*datasize, tmp_recvbuf+offset*datasize, sendcount*datasize); |
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| 90 | } |
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| 91 | |
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| 92 | delete[] mpi_recvcounts; |
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| 93 | delete[] mpi_displs; |
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| 94 | } |
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| 95 | |
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| 96 | MPI_Bcast_local(recvbuf, count*ep_size, datatype, 0, comm); |
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| 97 | |
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| 98 | MPI_Barrier(comm); |
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| 99 | |
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| 100 | |
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| 101 | if(is_master) |
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| 102 | { |
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| 103 | delete[] local_recvbuf; |
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| 104 | delete[] tmp_recvbuf; |
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| 105 | |
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| 106 | } |
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| 107 | |
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| 108 | } |
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| 109 | |
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| 110 | |
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| 111 | |
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| 112 | } |
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