Efficient Multi-LLM Serving with Workload Weaving

Welcome to the artifact repository for the USENIX ATC'25 accepted paper: "Efficient Multi-LLM Serving with Workload Weaving"! This artifact provides the necessary code and instructions to reproduce the experiments presented in our paper.

Environment Requirements

To artifact reviewers: Please skip this section and proceed to "How to Run". The required environment has already been set up on the provided platform.

1. At least 2 GPUs on the same machine with P2P (Peer-to-Peer) access enabled.
2. Miniconda or Miniforge for package management.
3. NVIDIA driver.
4. CUDA Toolkit (tested with version 12.1).
5. Root permission is required to run the NVIDIA MPS service.

Compile and Install Weaver and MuxServe

First, create the Conda environments:

yes |conda create -n muxserve python=3.10
yes |conda create -n weaver python=3.10

Next, set up essential environment variables. Ensure CUDA_HOME points to your CUDA installation:

export CUDA_HOME=/usr/local/cuda-12.1
export PATH=$CUDA_HOME/bin:$PATH
export LD_LIBRARY_PATH=$CUDA_HOME/lib64:$LD_LIBRARY_PATH
export CUDA_CXX=$CUDA_HOME/bin/nvcc

Building MuxServe

Activate the muxserve environment and install dependencies:

conda activate muxserve
cd ~/weaver/MuxServe; pip3 install -r requirements.txt --extra-index-url https://download.pytorch.org/whl/cu121;
cd ~/weaver/flash-attention; pip3 install --no-build-isolation -e . 
cd ~/weaver/MuxServe-vLLM; pip3 install -r requirements.txt; pip3 install --no-build-isolation -e . 
cd ~/weaver/MuxServe; pip3 install --no-build-isolation -e . 

Building Weaver

Activate the weaver environment:

conda activate weaver

Optional: Patch PyTorch for Faster Graph Replay

This section is an optional step to patch PyTorch, potentially improving graph replay performance.

• Prerequisites:

  • Set up your PyTorch build environment by following the official PyTorch repository instructions.

• Patching and compiling PyTorch: The following command line clones PyTorch, checks out version v2.5.1, and applies ~/weaver/pytorch.patch.

  # git clone https://github.com/pytorch/pytorch.git
  cd pytorch
  git checkout v2.5.1
  git apply ~/weaver/pytorch.patch;
  export _GLIBCXX_USE_CXX11_ABI=1
  export CMAKE_PREFIX_PATH=${CONDA_PREFIX:-"/home/weaver/miniforge3//"}
  
  CC=`which gcc-9` CXX=`which g++-9` CXXFLAGS='-Wno-maybe-uninitialized -Wno-uninitialized -Wno-free-nonheap-object -Wno-nonnull -std=c++17' CFLAGS='-Wno-maybe-uninitialized -Wno-uninitialized -Wno-free-nonheap-object -Wno-nonnull' USE_ROCM=0 TORCH_CUDA_ARCH_LIST="8.0" REL_WITH_DEB_INFO=1 USE_CUDA=1 MAX_JOBS=32 python setup.py develop

Build vLLM with Custom FlashAttention for Weaver

mkdir ~/weaver/vllm/vllm/vllm_flash_attn/
cd ~/weaver/vllm; pip3 install -r requirements-cuda.txt; VLLM_FLASH_ATTN_SRC_DIR=~/weaver/flash-attention python3 setup.py develop

How to Run

Follow these steps to run the experiments:

1. Enable NVIDIA MPS (Multi-Process Service) This is required for running MuxServe.

   cd ~/weaver/ae_exps/scripts; 
   sudo bash start_mps.sh ~/weaver/ae_exps/mps_log

2. Fix GPU/CPU frequencies for stable performance

   sudo nvidia-smi -pm 1
   # The following lock graphics clock (lgc) command is an example for A100 GPUs. 
   # Adjust frequencies if necessary for your specific hardware.
   sudo nvidia-smi -lgc 1410,1410 
   sudo cpupower frequency-set -g performance

3. Run the experiments:

   To artifact reviewers: Before starting, please ensure no other reviewer or user is working on the machine (e.g., by running the nvidia-smi command).

   This script will run for several hours.

   bash run_all.sh

After the script completes, you can find the log files in the ~/weaver/ae_exps/figure-x/ directories. The script will also generate figures (*.png) based on these log files, which will be located in the same figure-x directories.

Cite Our Paper

If you find our work useful, please consider citing our paper:

Shiwei Gao, Qing Wang, Shaoxun Zeng, Youyou Lu and Jiwu Shu. Weaver: Efficient Multi-LLM Serving with Workload Weaving. To appear in the 2025 USENIX Annual Technical Conference (USENIX ATC'25), Boston MA USA, July 2025.