[1604] | 1 | /*! |
---|
| 2 | \file ep_reduce.cpp |
---|
| 3 | \since 2 may 2016 |
---|
| 4 | |
---|
| 5 | \brief Definitions of MPI collective function: MPI_Reduce, MPI_Allreduce |
---|
| 6 | */ |
---|
| 7 | |
---|
| 8 | #include "ep_lib.hpp" |
---|
| 9 | #include <mpi.h> |
---|
| 10 | #include "ep_declaration.hpp" |
---|
| 11 | #include "ep_mpi.hpp" |
---|
| 12 | |
---|
| 13 | using namespace std; |
---|
| 14 | |
---|
| 15 | |
---|
| 16 | namespace ep_lib { |
---|
| 17 | |
---|
| 18 | |
---|
| 19 | int MPI_Reduce_scatter(const void *sendbuf, void *recvbuf, const int recvcounts[], MPI_Datatype datatype, MPI_Op op, MPI_Comm comm) |
---|
| 20 | { |
---|
| 21 | if(!comm->is_ep) return ::MPI_Reduce_scatter(sendbuf, recvbuf, recvcounts, to_mpi_type(datatype), to_mpi_op(op), to_mpi_comm(comm->mpi_comm)); |
---|
| 22 | if(comm->is_intercomm) return MPI_Reduce_scatter_intercomm(sendbuf, recvbuf, recvcounts, datatype, op, comm); |
---|
| 23 | |
---|
| 24 | |
---|
| 25 | int ep_rank = comm->ep_comm_ptr->size_rank_info[0].first; |
---|
| 26 | int ep_rank_loc = comm->ep_comm_ptr->size_rank_info[1].first; |
---|
| 27 | int mpi_rank = comm->ep_comm_ptr->size_rank_info[2].first; |
---|
| 28 | int ep_size = comm->ep_comm_ptr->size_rank_info[0].second; |
---|
| 29 | int num_ep = comm->ep_comm_ptr->size_rank_info[1].second; |
---|
| 30 | int mpi_size = comm->ep_comm_ptr->size_rank_info[2].second; |
---|
| 31 | |
---|
| 32 | |
---|
| 33 | ::MPI_Aint datasize, lb; |
---|
| 34 | |
---|
| 35 | ::MPI_Type_get_extent(*(static_cast< ::MPI_Datatype*>(datatype)), &lb, &datasize); |
---|
| 36 | |
---|
| 37 | bool is_master = ep_rank_loc==0; |
---|
| 38 | |
---|
| 39 | void* local_recvbuf; |
---|
| 40 | |
---|
| 41 | int count = accumulate(recvcounts, recvcounts+ep_size, 0); |
---|
| 42 | if(is_master) |
---|
| 43 | { |
---|
| 44 | local_recvbuf = new void*[datasize * count]; |
---|
| 45 | } |
---|
| 46 | |
---|
| 47 | MPI_Reduce_local(sendbuf, local_recvbuf, count, datatype, op, 0, comm); |
---|
| 48 | |
---|
| 49 | |
---|
| 50 | if(is_master) |
---|
| 51 | { |
---|
| 52 | ::MPI_Allreduce(MPI_IN_PLACE, local_recvbuf, count, to_mpi_type(datatype), to_mpi_op(op), to_mpi_comm(comm->mpi_comm)); |
---|
| 53 | } |
---|
| 54 | |
---|
| 55 | |
---|
| 56 | // master have reduced data |
---|
| 57 | // local scatterv |
---|
| 58 | |
---|
| 59 | std::vector<int> local_recvcounts(num_ep, 0); |
---|
| 60 | std::vector<int>local_displs(num_ep, 0); |
---|
| 61 | |
---|
| 62 | int my_recvcount = recvcounts[ep_rank]; |
---|
| 63 | MPI_Gather_local(&my_recvcount, 1, MPI_INT, local_recvcounts.data(), 0, comm); |
---|
| 64 | MPI_Bcast_local(local_recvcounts.data(), num_ep, MPI_INT, 0, comm); |
---|
| 65 | |
---|
| 66 | int my_displs = std::accumulate(recvcounts, recvcounts+ep_rank, 0); |
---|
| 67 | MPI_Gather_local(&my_displs, 1, MPI_INT, local_displs.data(), 0, comm); |
---|
| 68 | MPI_Bcast_local(local_displs.data(), num_ep, MPI_INT, 0, comm); |
---|
| 69 | |
---|
| 70 | |
---|
| 71 | |
---|
| 72 | MPI_Scatterv_local(local_recvbuf, local_recvcounts.data(), local_displs.data(), datatype, recvbuf, recvcounts[ep_rank], datatype, 0, comm); |
---|
| 73 | |
---|
| 74 | if(is_master) |
---|
| 75 | { |
---|
| 76 | delete[] local_recvbuf; |
---|
| 77 | } |
---|
| 78 | |
---|
| 79 | } |
---|
| 80 | |
---|
| 81 | int MPI_Reduce_scatter_intercomm(const void *sendbuf, void *recvbuf, const int recvcounts[], MPI_Datatype datatype, MPI_Op op, MPI_Comm comm) |
---|
| 82 | { |
---|
| 83 | printf("MPI_Reduce_scatter_intercomm not yet implemented\n"); |
---|
| 84 | MPI_Abort(comm, 0); |
---|
| 85 | } |
---|
| 86 | |
---|
| 87 | |
---|
| 88 | } |
---|
| 89 | |
---|