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https://github.com/NVIDIA/TensorRT-LLM.git
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95049eea86
Signed-off-by: thorjohnsen <41591019+thorjohnsen@users.noreply.github.com> Signed-off-by: Thor Johnsen <41591019+thorjohnsen@users.noreply.github.com> Co-authored-by: Iman Tabrizian <10105175+tabrizian@users.noreply.github.com> Co-authored-by: Robin Kobus <19427718+Funatiq@users.noreply.github.com>
96 lines
4.6 KiB
C++
96 lines
4.6 KiB
C++
/*
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* Copyright (c) 2022-2024, NVIDIA CORPORATION. All rights reserved.
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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 "tensorrt_llm/batch_manager/kvCacheManager.h"
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#include "tensorrt_llm/executor/types.h"
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#include "tensorrt_llm/runtime/bufferManager.h"
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#include "tensorrt_llm/runtime/cudaEvent.h"
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namespace tr = tensorrt_llm::runtime;
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namespace kvc = tensorrt_llm::executor::kv_cache;
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#pragma once
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namespace tensorrt_llm::batch_manager::kv_cache_manager
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{
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// The TransferManager accelerates transfers to/from the GPU by overlapping HtoD and DtoH transfers, and tracks ongoing
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// transfers in order to avoid race conditions. It is functionally equivalent to the prior approach of putting all
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// transfers into the forward pass stream. This is only ever used as a component of a KVCacheManager.
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class KVCacheTransferManager
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{
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public:
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explicit KVCacheTransferManager(
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tr::BufferManager const& bufferManager, std::shared_ptr<kvc::BaseLoopbackAgent> loopbackAgent = nullptr);
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//! \brief Onboard a block to gpu memory.
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void onboard(BlockPtr const& offloadBlock, BlockPtr const& block, std::vector<KVCacheBlockPool> const& pools,
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int numTokensToCopy = 0, executor::KvCacheTransferMode mode = executor::KvCacheTransferMode::DRAM,
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std::string const& directory = "");
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//! \brief Offload a block to cpu memory.
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void offload(BlockPtr const& block, BlockPtr const& offloadBlock, std::vector<KVCacheBlockPool> const& pools,
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int numTokensToCopy = 0, executor::KvCacheTransferMode mode = executor::KvCacheTransferMode::DRAM,
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std::string const& directory = "");
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//! \brief Synchronize internal streams with bufferManager stream.
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//! \details The buffer manager uses the same stream as the prefill and decode kernels. This method ensures that the
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//! internal kernels used for offloading and onboarding will wait for prefill and decode kernels before performing
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//! any block copies. This method must be called before the first call to KVCacheManager::addSequence in every step.
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void syncWithBufferManager();
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//! \brief Synchronize bufferManager stream with internal streams. This method ensures that prefill and decode
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//! kernels for next step will wait for offloading and onboarding work that has already been scheduled. This method
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//! must be called after last call to KVCacheManager::addSequence in every step.
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void syncTransfers();
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private:
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//! \brief Get pointer to pool specified by cache block.
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static tr::ITensor::SharedPtr computeBlockPointer(
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BlockPtr const& block, std::vector<KVCacheBlockPool> const& pools, size_t poolIdx);
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/*!
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* \brief The key method that copies the src block to the dst block.
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*
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* \param src Source block
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* \param dst Destination block
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* \param pools Pools describing memory layout for KV blocks
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* \param isOffload true => GPU->CPU/file, false => CPU/file->GPU
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* \param numTokensToCopy if > 0, partial copy is done
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* \param mode See \ref executor::KvCacheTransferMode
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* \param directory Directory to save the file if mode is GDS or POSIX_DEBUG_FALLBACK
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*
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* The default param is set to executor::KvCacheTransferMode::DRAM.
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*/
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void copyBlock(BlockPtr const& src, BlockPtr const& dst, std::vector<KVCacheBlockPool> const& pools, bool isOffload,
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int numTokensToCopy = 0, executor::KvCacheTransferMode mode = executor::KvCacheTransferMode::DRAM,
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std::string const& directory = "");
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runtime::BufferManager mBufferManager;
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runtime::BufferManager mOnboardManager;
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runtime::BufferManager mOffloadManager;
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// Track reads and writes for blocks. Note that it is the memory pool index that
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// identifies the raw memory blocks involved in I/O, not the block Id.
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std::unordered_map<kernels::KVCacheIndex::UnderlyingType, tr::CudaEvent> mPendingReads;
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std::unordered_map<kernels::KVCacheIndex::UnderlyingType, tr::CudaEvent> mPendingWrites;
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// Reference to parent loopback agent
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std::shared_ptr<kvc::BaseLoopbackAgent> mLoopbackAgent;
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int mDeviceId;
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};
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} // namespace tensorrt_llm::batch_manager::kv_cache_manager
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