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| Original file line number | Diff line number | Diff line change |
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| cc_library(processgroup SRCS ProcessGroup.cc DEPS pten pten_api eager_api) | ||
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|
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| if(WITH_NCCL) | ||
| cc_library(processgroup_nccl SRCS ProcessGroupNCCL.cc DEPS place cuda_stream enforce collective_helper device_context pten pten_api eager_api) | ||
| endif() |
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| // Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
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| #pragma once | ||
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| #include <cuda_runtime.h> | ||
| #include <error.h> | ||
| #include <string> | ||
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| #include "boost/variant.hpp" | ||
| #include "paddle/fluid/framework/data_type.h" | ||
| #include "paddle/fluid/framework/variable.h" | ||
| #include "paddle/fluid/platform/cuda_device_guard.h" | ||
| #include "paddle/fluid/platform/device_context.h" | ||
| #include "paddle/fluid/platform/dynload/nccl.h" | ||
| #include "paddle/fluid/platform/enforce.h" | ||
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| namespace paddle { | ||
| namespace distributed { | ||
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| #define NCCLCHECK(cmd) \ | ||
| do { \ | ||
| ncclResult_t r = cmd; \ | ||
| if (r != ncclSuccess) { \ | ||
| printf("Failed, NCCL error %s:%d '%s'\n", __FILE__, __LINE__, \ | ||
| platform::dynload::ncclGetErrorString(r)); \ | ||
| exit(EXIT_FAILURE); \ | ||
| } \ | ||
| } while (0) | ||
|
|
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| // NOTE(shenliang03): EventManager are movable not copyable CudaEvent wrapper. | ||
| // EventManage is different from paddle::platform::CudaEvent. | ||
| // It uses lazy initialization and is only created when the | ||
| // Record() method is called for the first time; it also monitors | ||
| // device information to ensure that recorded stream and event | ||
| // are on the same device. | ||
|
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| class EventManager { | ||
| public: | ||
| EventManager() {} | ||
| explicit EventManager(unsigned int flags) : flags_{flags} {} | ||
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| ~EventManager() { | ||
| if (is_created_) { | ||
| platform::CUDADeviceGuard guard(device_index_); | ||
| cudaEventDestroy(event_); | ||
| } | ||
| } | ||
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| EventManager(const EventManager&) = delete; | ||
| EventManager& operator=(const EventManager&) = delete; | ||
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| EventManager(EventManager&& other) { | ||
| std::swap(flags_, other.flags_); | ||
| std::swap(is_created_, other.is_created_); | ||
| std::swap(device_index_, other.device_index_); | ||
| std::swap(event_, other.event_); | ||
| } | ||
|
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| EventManager& operator=(EventManager&& other) { | ||
| std::swap(flags_, other.flags_); | ||
| std::swap(is_created_, other.is_created_); | ||
| std::swap(device_index_, other.device_index_); | ||
| std::swap(event_, other.event_); | ||
| return *this; | ||
| } | ||
|
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| bool IsCreated() const { return is_created_; } | ||
| bool DeviceId() const { return device_index_; } | ||
| gpuEvent_t GetRawCudaEvent() const { return event_; } | ||
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| void Record(const paddle::platform::CUDADeviceContext& ctx) { | ||
| auto device_index = ctx.GetPlace().device; | ||
| if (!is_created_) { | ||
| CreateEvent(device_index); | ||
| } | ||
| PADDLE_ENFORCE_EQ(device_index, device_index_, | ||
| platform::errors::PreconditionNotMet( | ||
| "CUDADeviceContext's device %d does not match" | ||
| "Event's device %d", | ||
| device_index, device_index_)); | ||
|
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| platform::CUDADeviceGuard guard(device_index_); | ||
| PADDLE_ENFORCE_GPU_SUCCESS(cudaEventRecord(event_, ctx.stream())); | ||
| } | ||
|
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| bool Query() const { | ||
| gpuError_t err = cudaEventQuery(event_); | ||
| if (err == cudaSuccess) { | ||
| return true; | ||
| } else if (err == cudaErrorNotReady) { | ||
| return false; | ||
| } else { | ||
| PADDLE_ENFORCE_GPU_SUCCESS(err); | ||
| return false; | ||
| } | ||
| } | ||
|
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| void Synchronize() const { | ||
| if (is_created_) { | ||
| PADDLE_ENFORCE_GPU_SUCCESS(cudaEventSynchronize(event_)); | ||
| } | ||
| } | ||
|
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| void Block(const paddle::platform::CUDADeviceContext& ctx) const { | ||
| if (is_created_) { | ||
| auto device_index = ctx.GetPlace().device; | ||
| PADDLE_ENFORCE_EQ(device_index, device_index_, | ||
| platform::errors::PreconditionNotMet( | ||
| "CUDADeviceContext's device %d does not match" | ||
| "Event's device %d", | ||
| device_index, device_index_)); | ||
| platform::CUDADeviceGuard guard(device_index_); | ||
| PADDLE_ENFORCE_GPU_SUCCESS(cudaStreamWaitEvent(ctx.stream(), event_, 0)); | ||
| } | ||
| } | ||
|
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| private: | ||
| unsigned int flags_ = cudaEventDefault; | ||
| bool is_created_{false}; | ||
| gpuEvent_t event_{}; | ||
| int8_t device_index_{0}; | ||
|
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| private: | ||
| void CreateEvent(int device_index) { | ||
| device_index_ = device_index; | ||
| platform::CUDADeviceGuard guard(device_index); | ||
| PADDLE_ENFORCE_GPU_SUCCESS(cudaEventCreateWithFlags(&event_, flags_)); | ||
| is_created_ = true; | ||
| } | ||
| }; | ||
|
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| // NOTE(shenliang03): NCCLCommManager is more lightweight than | ||
| // platform::NCCLComm | ||
|
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| class NCCLCommManager { | ||
| public: | ||
| explicit NCCLCommManager(ncclComm_t ncclComm) : nccl_comm_(ncclComm) {} | ||
|
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| NCCLCommManager() : NCCLCommManager(nullptr) {} | ||
|
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| ~NCCLCommManager() noexcept { | ||
| std::unique_lock<std::mutex> lock(mutex_); | ||
| if (nccl_comm_) { | ||
| platform::dynload::ncclCommDestroy(nccl_comm_); | ||
| } | ||
| } | ||
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| static std::shared_ptr<NCCLCommManager> Create(int num_ranks, int rank, | ||
| ncclUniqueId comm_id) { | ||
| auto nccl_manager = std::make_shared<NCCLCommManager>(); | ||
| NCCLCHECK(platform::dynload::ncclCommInitRank(&(nccl_manager->nccl_comm_), | ||
| num_ranks, comm_id, rank)); | ||
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| nccl_manager->nccl_id_ = comm_id; | ||
| nccl_manager->rank_ = rank; | ||
| return nccl_manager; | ||
| } | ||
|
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| ncclUniqueId GetNcclId() const { | ||
| std::unique_lock<std::mutex> lock(mutex_); | ||
| return nccl_id_; | ||
| } | ||
|
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| ncclComm_t GetNcclComm() const { | ||
| std::unique_lock<std::mutex> lock(mutex_); | ||
| return nccl_comm_; | ||
| } | ||
|
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| NCCLCommManager(const NCCLCommManager&) = delete; | ||
| NCCLCommManager& operator=(const NCCLCommManager&) = delete; | ||
| NCCLCommManager& operator=(NCCLCommManager&& other) = delete; | ||
|
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| NCCLCommManager(NCCLCommManager&& other) { | ||
| std::unique_lock<std::mutex> lock(other.mutex_); | ||
| std::swap(nccl_comm_, other.nccl_comm_); | ||
| } | ||
|
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| protected: | ||
| ncclComm_t nccl_comm_; | ||
| ncclUniqueId nccl_id_; | ||
| int rank_; | ||
| mutable std::mutex mutex_; | ||
| }; | ||
|
|
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| } // namespace distributed | ||
| } // namespace paddle |
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