forked from huawei/mindspore2022
88 lines
2.8 KiB
C++
88 lines
2.8 KiB
C++
/**
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* Copyright 2019 Huawei Technologies Co., Ltd
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "device/gpu/distribution/mpi_wrapper.h"
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#include <cuda_runtime_api.h>
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#include <string>
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#include "device/gpu/distribution/nccl_wrapper.h"
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namespace mindspore {
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namespace device {
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namespace gpu {
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MPIWrapper::MPIWrapper() : rank_id_(0), rank_size_(0), local_rank_id_(0) { Init(); }
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MPIWrapper::~MPIWrapper() {
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int finalized;
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MPI_Finalized(&finalized);
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if (finalized == 0) {
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MPI_Finalize();
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}
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}
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MPIWrapper &MPIWrapper::instance() {
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static MPIWrapper instance;
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return instance;
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}
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int MPIWrapper::local_rank_id() const { return local_rank_id_; }
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void MPIWrapper::Init() {
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int initialized;
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CHECK_RET(MPI_Initialized(&initialized), MPI_SUCCESS, "Failed to check mpi initialization status.");
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if (initialized == 0) {
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MPI_Init(nullptr, nullptr);
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}
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CHECK_RET(MPI_Comm_rank(MPI_COMM_WORLD, &rank_id_), MPI_SUCCESS, "Failed to init mpi rank id.");
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CHECK_RET(MPI_Comm_size(MPI_COMM_WORLD, &rank_size_), MPI_SUCCESS, "Failed to init mpi rank size.");
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NCCLWrapper::instance().set_rank(rank_id_, rank_size_);
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AssignLocalRankId();
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ncclUniqueId unique_id;
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if (rank_id_ == 0) {
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unique_id = NCCLWrapper::instance().nccl_unique_id();
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}
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CHECK_RET(MPI_Bcast(reinterpret_cast<void *>(&unique_id), sizeof(unique_id), MPI_BYTE, 0, MPI_COMM_WORLD),
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MPI_SUCCESS, "Failed to broadcast nccl unique id.");
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NCCLWrapper::instance().set_nccl_unique_id(unique_id);
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return;
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}
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void MPIWrapper::AssignLocalRankId() {
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char host_name[MAX_HOSTNAME_LEN] = {0};
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CHECK_RET(gethostname(host_name, MAX_HOSTNAME_LEN), 0, "Getting host name failed.");
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size_t host_hash = std::hash<std::string>()(host_name);
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const int kRankSize = rank_size_;
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size_t all_host_hashs[kRankSize];
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all_host_hashs[rank_id_] = host_hash;
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CHECK_RET(MPI_Allgather(MPI_IN_PLACE, 0, MPI_DATATYPE_NULL, all_host_hashs, sizeof(size_t), MPI_BYTE, MPI_COMM_WORLD),
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MPI_SUCCESS, "MPI_Allgather host hashs failed.");
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for (int global_rank = 0; global_rank < kRankSize; global_rank++) {
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if (global_rank == rank_id_) {
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break;
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}
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if (all_host_hashs[global_rank] == all_host_hashs[rank_id_]) {
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local_rank_id_++;
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}
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}
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return;
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}
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} // namespace gpu
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} // namespace device
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} // namespace mindspore
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