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https://github.com/NVIDIA/TensorRT-LLM.git
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dca6397d1e
* Instead of allocating UserBuffers at beginning of runtime, UB buffers are now managed with global allocator. The allocator will dynamically assign free UB buffer or allocate new buffer for torch tensor. It makes userbuffers easier to use. * In common usecase, the Userbuffers will be allocated correctly during warm up stage. There is no dynamic allocation during inference. * UB fusion pattern is rewroten using the new UB Allocator. It contains following passes: 1. Fuse Quant with allreduce, replace with UB impl, and insert a copy_to_userbuffers. Currently the normal allreduce still does not support FP8 quant. So this need to be done in UB pass 2. Convert all supported allreduce with UB and insert copy_to_userbuffers. 3. Fuse op before ar with the copy_to_userbuffers. So the op directly writes to the userbuffer 4. Remove userbuffers finalize if the output is connect to another UB allreduce. Signed-off-by: Jin Li <59594262+liji-nv@users.noreply.github.com>
60 lines
2.0 KiB
C++
60 lines
2.0 KiB
C++
/*
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* Copyright (c) 2025, 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/common/dataType.h"
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#include "tensorrt_llm/kernels/userbuffers/ub_interface.h"
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#include "tensorrt_llm/runtime/torchUtils.h"
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#include "tensorrt_llm/thop/thUtils.h"
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#include "userbuffersTensor.h"
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#include <torch/extension.h>
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namespace torch_ext
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{
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torch::Tensor userbuffers_allreduce_finalize(torch::Tensor input, bool force_applying_finalize)
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{
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#if ENABLE_MULTI_DEVICE
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auto stream = at::cuda::getCurrentCUDAStream(input.get_device());
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size_t size = input.numel();
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int hidden_size = input.size(-1);
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auto& ub_manager = tensorrt_llm::runtime::ub::UserBuffersManager::get_instance();
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auto [output, ub_buffer] = torch_ext::create_userbuffers_tensor(input.sizes(), input.scalar_type());
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auto const dtype = tensorrt_llm::runtime::TorchUtils::dataType(input.scalar_type());
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tensorrt_llm::kernels::ub::allgather2_userbuff_residual_launcher(ub_buffer.handle, 0, size, hidden_size,
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input.data_ptr(), dtype, ub_manager.comm(), stream, force_applying_finalize);
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return output;
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#else
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return input;
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#endif // ENABLE_MULTI_DEVICE
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}
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} // namespace torch_ext
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TORCH_LIBRARY_FRAGMENT(trtllm, m)
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{
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m.def("userbuffers_allreduce_finalize(Tensor input, bool force_applying_finalize) -> Tensor");
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}
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TORCH_LIBRARY_IMPL(trtllm, CUDA, m)
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{
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m.impl("userbuffers_allreduce_finalize", &torch_ext::userbuffers_allreduce_finalize);
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}
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