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LocalAI/backend/python/sglang/install.sh
Ettore Di Giacinto d47e2aa93f feat(backends): add sglang
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
2026-04-15 22:08:49 +00:00

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#!/bin/bash
set -e
EXTRA_PIP_INSTALL_FLAGS="--no-build-isolation"
# Avoid overcommitting the CPU during builds that compile native code.
export NVCC_THREADS=2
export MAX_JOBS=1
backend_dir=$(dirname $0)
if [ -d $backend_dir/common ]; then
source $backend_dir/common/libbackend.sh
else
source $backend_dir/../common/libbackend.sh
fi
if [ "x${BUILD_PROFILE}" == "xintel" ]; then
EXTRA_PIP_INSTALL_FLAGS+=" --upgrade --index-strategy=unsafe-first-match"
fi
if [ "x${BUILD_PROFILE}" == "xcpu" ]; then
EXTRA_PIP_INSTALL_FLAGS+=" --index-strategy=unsafe-best-match"
fi
# sglang's CPU path has no prebuilt wheel on PyPI — upstream publishes
# a separate pyproject_cpu.toml that must be swapped in before `pip install`.
# Reference: docker/xeon.Dockerfile in the sglang upstream repo.
#
# When BUILD_TYPE is empty (CPU profile) or FROM_SOURCE=true is forced,
# install torch/transformers/etc from requirements-cpu.txt, then clone
# sglang and install its python/ and sgl-kernel/ packages from source
# using the CPU pyproject.
if [ "x${BUILD_TYPE}" == "x" ] || [ "x${FROM_SOURCE:-}" == "xtrue" ]; then
# sgl-kernel's CPU build links against libnuma and libtbb. Install
# them here (Docker builder stage) before running the source build.
# Harmless no-op on runs outside the docker build since installRequirements
# below still needs them only if we reach the source build branch.
if command -v apt-get >/dev/null 2>&1 && [ "$(id -u)" = "0" ]; then
apt-get update
DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
libnuma-dev numactl libtbb-dev libgomp1 libomp-dev google-perftools \
build-essential cmake ninja-build
fi
installRequirements
# sgl-kernel's pyproject_cpu.toml uses scikit-build-core as its build
# backend. With --no-build-isolation, that (and ninja/cmake) must be
# present in the venv before we build from source.
uv pip install --no-build-isolation "scikit-build-core>=0.10" ninja cmake
_sgl_src=$(mktemp -d)
trap 'rm -rf "${_sgl_src}"' EXIT
git clone --depth 1 https://github.com/sgl-project/sglang "${_sgl_src}/sglang"
pushd "${_sgl_src}/sglang/sgl-kernel"
if [ -f pyproject_cpu.toml ]; then
cp pyproject_cpu.toml pyproject.toml
fi
uv pip install ${EXTRA_PIP_INSTALL_FLAGS:-} .
popd
pushd "${_sgl_src}/sglang/python"
if [ -f pyproject_cpu.toml ]; then
cp pyproject_cpu.toml pyproject.toml
fi
uv pip install ${EXTRA_PIP_INSTALL_FLAGS:-} .
popd
else
installRequirements
fi