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vllm/tools/flashinfer-build.sh

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#!/usr/bin/env bash
# This script is used to build FlashInfer wheels with AOT kernels
set -ex
# FlashInfer configuration
FLASHINFER_GIT_REPO="https://github.com/flashinfer-ai/flashinfer.git"
BUILD_WHEEL="${BUILD_WHEEL:-true}"
if [[ -z "${FLASHINFER_GIT_REF}" ]]; then
echo "❌ FLASHINFER_GIT_REF must be specified" >&2
exit 1
fi
if [[ -z "${CUDA_VERSION}" ]]; then
echo "❌ CUDA_VERSION must be specified" >&2
exit 1
fi
echo "🏗️ Building FlashInfer ${FLASHINFER_GIT_REF} for CUDA ${CUDA_VERSION}"
# Clone FlashInfer
git clone --depth 1 --recursive --shallow-submodules \
--branch "${FLASHINFER_GIT_REF}" \
${FLASHINFER_GIT_REPO} flashinfer
# Set CUDA arch list based on CUDA version
# Exclude CUDA arches for older versions (11.x and 12.0-12.7)
if [[ "${CUDA_VERSION}" == 11.* ]]; then
FI_TORCH_CUDA_ARCH_LIST="7.5 8.0 8.9"
elif [[ "${CUDA_VERSION}" == 12.[0-7]* ]]; then
FI_TORCH_CUDA_ARCH_LIST="7.5 8.0 8.9 9.0a"
elif [[ "${CUDA_VERSION}" == 12.[8-9]* ]]; then
# CUDA 12.812.9
FI_TORCH_CUDA_ARCH_LIST="7.5 8.0 8.9 9.0a 10.0a 10.3a 12.0"
else
# CUDA 13.0+
FI_TORCH_CUDA_ARCH_LIST="7.5 8.0 8.9 9.0a 10.0f 12.0"
fi
echo "🏗️ Building FlashInfer AOT for arches: ${FI_TORCH_CUDA_ARCH_LIST}"
pushd flashinfer
# Make sure the wheel is built for the correct CUDA version
export UV_TORCH_BACKEND=cu$(echo "$CUDA_VERSION" | cut -d. -f1,2 | tr -d '.')
# Build AOT kernels
export TORCH_CUDA_ARCH_LIST="${FI_TORCH_CUDA_ARCH_LIST}"
export FLASHINFER_CUDA_ARCH_LIST="${FI_TORCH_CUDA_ARCH_LIST}"
python3 -m flashinfer.aot
if [[ "${BUILD_WHEEL}" == "true" ]]; then
# Build wheel for distribution
uv build --no-build-isolation --wheel --out-dir ../flashinfer-dist .
echo "✅ FlashInfer wheel built successfully in flashinfer-dist/"
else
# Install directly (for Dockerfile)
uv pip install --system --no-build-isolation --force-reinstall .
echo "✅ FlashInfer installed successfully"
fi
popd
# Cleanup
rm -rf flashinfer