[1381] | 1 | /*! |
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| 2 | \file ep_reduce.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_Reduce, MPI_Allreduce |
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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 | |
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| 16 | namespace ep_lib |
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| 17 | { |
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| 18 | |
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| 19 | |
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| 20 | |
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| 21 | int MPI_Allreduce(const void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MPI_Op op, MPI_Comm comm) |
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| 22 | { |
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| 23 | if(!comm.is_ep && comm.mpi_comm) |
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| 24 | { |
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| 25 | return ::MPI_Allreduce(sendbuf, recvbuf, count, to_mpi_type(datatype), to_mpi_op(op), to_mpi_comm(comm.mpi_comm)); |
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| 26 | } |
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| 27 | |
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| 28 | |
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| 29 | |
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| 30 | int ep_rank = comm.ep_comm_ptr->size_rank_info[0].first; |
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| 31 | int ep_rank_loc = comm.ep_comm_ptr->size_rank_info[1].first; |
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| 32 | int mpi_rank = comm.ep_comm_ptr->size_rank_info[2].first; |
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| 33 | int ep_size = comm.ep_comm_ptr->size_rank_info[0].second; |
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| 34 | int num_ep = comm.ep_comm_ptr->size_rank_info[1].second; |
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| 35 | int mpi_size = comm.ep_comm_ptr->size_rank_info[2].second; |
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| 36 | |
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| 37 | |
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| 38 | ::MPI_Aint datasize, lb; |
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| 39 | |
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| 40 | ::MPI_Type_get_extent(to_mpi_type(datatype), &lb, &datasize); |
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| 41 | |
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| 42 | bool is_master = ep_rank_loc==0; |
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| 43 | |
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| 44 | void* local_recvbuf; |
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| 45 | |
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| 46 | if(is_master) |
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| 47 | { |
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| 48 | local_recvbuf = new void*[datasize * count]; |
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| 49 | } |
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| 50 | |
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| 51 | MPI_Reduce_local(sendbuf, local_recvbuf, count, datatype, op, 0, comm); |
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| 52 | |
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| 53 | |
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| 54 | |
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| 55 | if(is_master) |
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| 56 | { |
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| 57 | ::MPI_Allreduce(local_recvbuf, recvbuf, count, to_mpi_type(datatype), to_mpi_op(op), to_mpi_comm(comm.mpi_comm)); |
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| 58 | } |
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| 59 | |
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| 60 | MPI_Bcast_local(recvbuf, count, datatype, 0, comm); |
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| 61 | |
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| 62 | |
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| 63 | if(is_master) |
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| 64 | { |
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| 65 | delete[] local_recvbuf; |
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| 66 | } |
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| 67 | |
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| 68 | MPI_Barrier_local(comm); |
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| 69 | } |
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| 70 | |
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| 71 | |
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| 72 | |
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| 73 | |
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| 74 | } |
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| 75 | |
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