[1604] | 1 | /*! |
---|
| 2 | \file ep_gather.cpp |
---|
| 3 | \since 2 may 2016 |
---|
| 4 | |
---|
| 5 | \brief Definitions of MPI collective function: MPI_Scatterv |
---|
| 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 | namespace ep_lib |
---|
| 16 | { |
---|
| 17 | |
---|
| 18 | int MPI_Scatterv_local(const void *sendbuf, const int sendcounts[], const int displs[], MPI_Datatype sendtype, void *recvbuf, int recvcount, |
---|
| 19 | MPI_Datatype recvtype, int local_root, MPI_Comm comm) |
---|
| 20 | { |
---|
| 21 | |
---|
| 22 | assert(valid_type(sendtype) && valid_type(recvtype)); |
---|
| 23 | |
---|
| 24 | ::MPI_Aint datasize, lb; |
---|
| 25 | ::MPI_Type_get_extent(to_mpi_type(sendtype), &lb, &datasize); |
---|
| 26 | |
---|
| 27 | int ep_rank_loc = comm->ep_comm_ptr->size_rank_info[1].first; |
---|
| 28 | int num_ep = comm->ep_comm_ptr->size_rank_info[1].second; |
---|
| 29 | |
---|
| 30 | assert(recvcount == sendcounts[ep_rank_loc]); |
---|
| 31 | |
---|
| 32 | if(ep_rank_loc == local_root) |
---|
| 33 | comm->my_buffer->void_buffer[local_root] = const_cast<void*>(sendbuf); |
---|
| 34 | |
---|
| 35 | MPI_Barrier_local(comm); |
---|
| 36 | |
---|
| 37 | #pragma omp critical (_scatterv) |
---|
| 38 | memcpy(recvbuf, comm->my_buffer->void_buffer[local_root]+datasize*displs[ep_rank_loc], datasize * recvcount); |
---|
| 39 | |
---|
| 40 | |
---|
| 41 | MPI_Barrier_local(comm); |
---|
| 42 | } |
---|
| 43 | |
---|
| 44 | int MPI_Scatterv(const void *sendbuf, const int sendcounts[], const int displs[], MPI_Datatype sendtype, void *recvbuf, int recvcount, |
---|
| 45 | MPI_Datatype recvtype, int root, MPI_Comm comm) |
---|
| 46 | { |
---|
| 47 | if(!comm->is_ep) return ::MPI_Scatterv(sendbuf, sendcounts, displs, to_mpi_type(sendtype), recvbuf, recvcount, to_mpi_type(recvtype), root, to_mpi_comm(comm->mpi_comm)); |
---|
| 48 | if(comm->is_intercomm) return MPI_Scatterv_intercomm(sendbuf, sendcounts, displs, sendtype, recvbuf, recvcount, recvtype, root, comm); |
---|
| 49 | |
---|
| 50 | assert(sendtype == recvtype); |
---|
| 51 | |
---|
| 52 | int ep_rank = comm->ep_comm_ptr->size_rank_info[0].first; |
---|
| 53 | int ep_rank_loc = comm->ep_comm_ptr->size_rank_info[1].first; |
---|
| 54 | int mpi_rank = comm->ep_comm_ptr->size_rank_info[2].first; |
---|
| 55 | int ep_size = comm->ep_comm_ptr->size_rank_info[0].second; |
---|
| 56 | int num_ep = comm->ep_comm_ptr->size_rank_info[1].second; |
---|
| 57 | int mpi_size = comm->ep_comm_ptr->size_rank_info[2].second; |
---|
| 58 | |
---|
| 59 | int root_mpi_rank = comm->ep_rank_map->at(root).second; |
---|
| 60 | int root_ep_loc = comm->ep_rank_map->at(root).first; |
---|
| 61 | |
---|
| 62 | bool is_master = (ep_rank_loc==0 && mpi_rank != root_mpi_rank ) || ep_rank == root; |
---|
| 63 | bool is_root = ep_rank == root; |
---|
| 64 | |
---|
| 65 | MPI_Datatype datatype = sendtype; |
---|
| 66 | int count = recvcount; |
---|
| 67 | |
---|
| 68 | ::MPI_Aint datasize, lb; |
---|
| 69 | ::MPI_Type_get_extent(to_mpi_type(datatype), &lb, &datasize); |
---|
| 70 | |
---|
| 71 | void *tmp_sendbuf; |
---|
| 72 | if(is_root) tmp_sendbuf = new void*[ep_size * count * datasize]; |
---|
| 73 | |
---|
| 74 | // reorder tmp_sendbuf |
---|
| 75 | std::vector<int>local_ranks(num_ep); |
---|
| 76 | std::vector<int>ranks(ep_size); |
---|
| 77 | |
---|
| 78 | if(mpi_rank == root_mpi_rank) MPI_Gather_local(&ep_rank, 1, MPI_INT, local_ranks.data(), root_ep_loc, comm); |
---|
| 79 | else MPI_Gather_local(&ep_rank, 1, MPI_INT, local_ranks.data(), 0, comm); |
---|
| 80 | |
---|
| 81 | |
---|
| 82 | std::vector<int> recvcounts(mpi_size, 0); |
---|
| 83 | std::vector<int> my_displs(mpi_size, 0); |
---|
| 84 | |
---|
| 85 | |
---|
| 86 | if(is_master) |
---|
| 87 | { |
---|
| 88 | for(int i=0; i<ep_size; i++) |
---|
| 89 | { |
---|
| 90 | recvcounts[comm->ep_rank_map->at(i).second]++; |
---|
| 91 | } |
---|
| 92 | |
---|
| 93 | for(int i=1; i<mpi_size; i++) |
---|
| 94 | my_displs[i] = my_displs[i-1] + recvcounts[i-1]; |
---|
| 95 | |
---|
| 96 | ::MPI_Gatherv(local_ranks.data(), num_ep, to_mpi_type(MPI_INT), ranks.data(), recvcounts.data(), my_displs.data(), to_mpi_type(MPI_INT), root_mpi_rank, to_mpi_comm(comm->mpi_comm)); |
---|
| 97 | } |
---|
| 98 | |
---|
| 99 | |
---|
| 100 | if(is_root) |
---|
| 101 | { |
---|
| 102 | int local_displs = 0; |
---|
| 103 | for(int i=0; i<ep_size; i++) |
---|
| 104 | { |
---|
| 105 | memcpy(tmp_sendbuf+local_displs, sendbuf + displs[ranks[i]]*datasize, sendcounts[ranks[i]]*datasize); |
---|
| 106 | local_displs += sendcounts[ranks[i]]*datasize; |
---|
| 107 | } |
---|
| 108 | } |
---|
| 109 | |
---|
| 110 | // MPI_Scatterv from root to masters |
---|
| 111 | |
---|
| 112 | void* local_sendbuf; |
---|
| 113 | int local_sendcount; |
---|
| 114 | if(mpi_rank == root_mpi_rank) MPI_Reduce_local(&recvcount, &local_sendcount, 1, MPI_INT, MPI_SUM, root_ep_loc, comm); |
---|
| 115 | else MPI_Reduce_local(&recvcount, &local_sendcount, 1, MPI_INT, MPI_SUM, 0, comm); |
---|
| 116 | |
---|
| 117 | if(is_master) |
---|
| 118 | { |
---|
| 119 | local_sendbuf = new void*[datasize * local_sendcount]; |
---|
| 120 | |
---|
| 121 | ::MPI_Gather(&local_sendcount, 1, to_mpi_type(MPI_INT), recvcounts.data(), 1, to_mpi_type(MPI_INT), root_mpi_rank, to_mpi_comm(comm->mpi_comm)); |
---|
| 122 | |
---|
| 123 | if(is_root) for(int i=1; i<mpi_size; i++) my_displs[i] = my_displs[i-1] + recvcounts[i-1]; |
---|
| 124 | |
---|
| 125 | ::MPI_Scatterv(tmp_sendbuf, recvcounts.data(), my_displs.data(), to_mpi_type(sendtype), local_sendbuf, num_ep*count, to_mpi_type(recvtype), root_mpi_rank, to_mpi_comm(comm->mpi_comm)); |
---|
| 126 | } |
---|
| 127 | |
---|
| 128 | std::vector<int>local_sendcounts(num_ep, 0); |
---|
| 129 | std::vector<int>local_displs(num_ep, 0); |
---|
| 130 | |
---|
| 131 | MPI_Gather_local(&recvcount, 1, MPI_INT, local_sendcounts.data(), 0, comm); |
---|
| 132 | MPI_Bcast_local(local_sendcounts.data(), num_ep, MPI_INT, 0, comm); |
---|
| 133 | for(int i=1; i<num_ep; i++) |
---|
| 134 | local_displs[i] = local_displs[i-1] + local_sendcounts[i-1]; |
---|
| 135 | |
---|
| 136 | |
---|
| 137 | if(mpi_rank == root_mpi_rank) MPI_Scatterv_local(local_sendbuf, local_sendcounts.data(), local_displs.data(), sendtype, recvbuf, recvcount, recvtype, root_ep_loc, comm); |
---|
| 138 | else MPI_Scatterv_local(local_sendbuf, local_sendcounts.data(), local_displs.data(), sendtype, recvbuf, recvcount, recvtype, 0, comm); |
---|
| 139 | |
---|
| 140 | |
---|
| 141 | if(is_root) delete[] tmp_sendbuf; |
---|
| 142 | if(is_master) delete[] local_sendbuf; |
---|
| 143 | } |
---|
| 144 | |
---|
| 145 | |
---|
| 146 | int MPI_Scatterv_intercomm(const void *sendbuf, const int sendcounts[], const int displs[], MPI_Datatype sendtype, void *recvbuf, int recvcount, |
---|
| 147 | MPI_Datatype recvtype, int root, MPI_Comm comm) |
---|
| 148 | { |
---|
| 149 | printf("MPI_Scatterv_intercomm not yet implemented\n"); |
---|
| 150 | MPI_Abort(comm, 0); |
---|
| 151 | } |
---|
| 152 | |
---|
| 153 | |
---|
| 154 | } |
---|