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CMakeLists.txt
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CMakeLists.txt
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# This CMake config hopefully makes it easier to compile.
# Ensure the CUDA Toolkit is available on your path. Then run:
# For GCC: `cmake -B build . && cmake --build build`
# For MSVC: `cmake -B build . && cmake --build build --config Release`
# You can also use the following options and variables
# - COMPUTE_BACKEND: Set to `cpu`, `cuda`, or `mps` to select the backend
# - NO_CUBLASLT: Default OFF, will skip building/linking CUBLASLT support
# - CUDA_VERSION: The expected CUDA version, for sanity checking. The actual version
# is whatever CMake finds on your path.
# - COMPUTE_CAPABILITY: Which GPU Arch/Compute codes to provide to NVCC.
# Separate by semicolons, i.e. `-DCOMPUTE_CAPABILITY=89;90`
# Check your compute capability here: https://developer.nvidia.com/cuda-gpus
# - PTXAS_VERBOSE: Pass the `-v` option to the PTX Assembler
cmake_minimum_required(VERSION 3.22.1)
project(bitsandbytes LANGUAGES CXX)
# If run without specifying a build type, default to using the Release configuration:
# optimizing the generated binaries for performance and also adds the `-DNDEBUG` flag,
# which turns off a bunch of asserts which seem to link to new symbols in libstdc++,
# worsening our many_linux compliance..
if(NOT CMAKE_BUILD_TYPE)
set(CMAKE_BUILD_TYPE Release)
endif()
# Define included source files
set(CPP_FILES csrc/common.cpp csrc/cpu_ops.cpp csrc/pythonInterface.cpp)
set(CUDA_FILES csrc/ops.cu csrc/kernels.cu)
set(MPS_FILES csrc/mps_ops.mm)
set(METAL_FILES csrc/mps_kernels.metal)
# C++ sources are always included
list(APPEND SRC_FILES ${CPP_FILES})
set(COMPUTE_BACKEND "cpu" CACHE STRING "The compute backend to use (cpu, cuda, mps)")
set_property(CACHE COMPUTE_BACKEND PROPERTY STRINGS cpu cuda mps)
option(PTXAS_VERBOSE "Pass through -v flag to PTX Assembler" OFF)
if(APPLE)
set(CMAKE_OSX_DEPLOYMENT_TARGET 13.1)
endif()
set(BNB_OUTPUT_NAME "bitsandbytes")
message(STATUS "Configuring ${PROJECT_NAME} (Backend: ${COMPUTE_BACKEND})")
if(${COMPUTE_BACKEND} STREQUAL "cuda")
if(APPLE)
message(FATAL_ERROR "CUDA is not supported on macOS" )
endif()
option(NO_CUBLASLT "Disable CUBLAS" OFF)
set(BUILD_CUDA ON)
set(BUILD_MPS OFF)
message(STATUS "NO_CUBLASLT := ${NO_CUBLASLT}")
elseif(${COMPUTE_BACKEND} STREQUAL "mps")
if(NOT APPLE)
message(FATAL_ERROR "MPS is only supported on macOS" )
endif()
set(BUILD_CUDA OFF)
set(BUILD_MPS ON)
else()
set(BUILD_CUDA OFF)
set(BUILD_MPS OFF)
endif()
if(BUILD_CUDA)
# NVCC normally will only work with MSVC up to 1939. VS2022 17.10+ starts using versions 1940+.
# Workaround: use --allow-unsupported-compiler
# This needs to be added *before* we try to enable the CUDA language so CMake's compiler check passes.
if(MSVC AND MSVC_VERSION VERSION_GREATER_EQUAL 1940)
string(APPEND CMAKE_CUDA_FLAGS " --allow-unsupported-compiler")
endif()
enable_language(CUDA) # This will fail if CUDA is not found
find_package(CUDAToolkit REQUIRED)
# Convert the CUDA version from X.Y.z to XY. There's probably a shorter way of doing this
string(REGEX MATCH "^[0-9]+.[0-9]+" _CUDA_VERSION_FIRST_TWO "${CMAKE_CUDA_COMPILER_VERSION}")
string(REPLACE "." "" CUDA_VERSION_SHORT "${_CUDA_VERSION_FIRST_TWO}")
# Expose a cache variable that the user can set to ensure the correct version of CUDA is found
set(CUDA_VERSION "${CUDA_VERSION_SHORT}" CACHE STRING "Expected CUDA Version Shortcode")
message(STATUS "CUDA Version: ${CUDA_VERSION_SHORT} (${CMAKE_CUDA_COMPILER_VERSION})")
message(STATUS "CUDA Compiler: ${CMAKE_CUDA_COMPILER}")
# It should match the discovered version
if(NOT CUDA_VERSION STREQUAL "${CUDA_VERSION_SHORT}")
message(FATAL_ERROR "You've specified CUDA version ${CUDA_VERSION} however the CUDA compiler found is ${CUDA_VERSION_SHORT}."
" Ensure the desired CUDA compiler is the first one available on your PATH."
)
endif()
if(CMAKE_CUDA_COMPILER_VERSION VERSION_LESS "11.0")
message(FATAL_ERROR "CUDA Version < 11 is not supported")
elseif(CMAKE_CUDA_COMPILER_VERSION VERSION_GREATER_EQUAL "13.0")
message(FATAL_ERROR "CUDA Version > 12 is not supported")
endif()
# CMake < 3.23.0 does not define CMAKE_CUDA_ARCHITECTURES_ALL.
if(CMAKE_VERSION VERSION_LESS "3.23.0")
message(STATUS "CMake < 3.23.0; determining CUDA architectures supported...")
# 11.x and 12.x both support these at a minimum.
set(CMAKE_CUDA_ARCHITECTURES_ALL 50 52 53 60 61 62 70 72 75 80)
set(CMAKE_CUDA_ARCHITECTURES_ALL_MAJOR 50 60 70 80)
# CUDA 11.1 adds Ampere support for GA102-GA107.
if (CMAKE_CUDA_COMPILER_VERSION VERSION_GREATER_EQUAL "11.1")
list(APPEND CMAKE_CUDA_ARCHITECTURES_ALL 86)
endif()
# CUDA 11.4 adds Ampere support for GA10B.
if (CMAKE_CUDA_COMPILER_VERSION VERSION_GREATER_EQUAL "11.4")
list(APPEND CMAKE_CUDA_ARCHITECTURES_ALL 87)
endif()
# CUDA 11.8 adds support for Ada and Hopper.
if (CMAKE_CUDA_COMPILER_VERSION VERSION_GREATER_EQUAL "11.8")
list(APPEND CMAKE_CUDA_ARCHITECTURES_ALL 89 90)
list(APPEND CMAKE_CUDA_ARCHITECTURES_ALL_MAJOR 90)
endif()
endif()
string(APPEND CMAKE_CUDA_FLAGS " --use_fast_math")
if(PTXAS_VERBOSE)
# Verbose? Outputs register usage information, and other things...
string(APPEND CMAKE_CUDA_FLAGS " -Xptxas=-v")
endif()
foreach(capability ${CMAKE_CUDA_ARCHITECTURES_ALL})
# Most of the items here are like: `xx-real`, so we just extract the `xx` portion
string(REGEX MATCH "[0-9]+" capability_id "${capability}")
if(capability_id GREATER 0)
list(APPEND POSSIBLE_CAPABILITIES ${capability_id})
endif()
endforeach()
# This can be changed via -D argument to CMake
# By default all possible capabilities are compiled
set(COMPUTE_CAPABILITY "${POSSIBLE_CAPABILITIES}" CACHE STRING "Compute Capabilities Targeted")
message(STATUS "CUDA Capabilities Available: ${POSSIBLE_CAPABILITIES}")
message(STATUS "CUDA Capabilities Selected: ${COMPUTE_CAPABILITY}")
# Use the "real" option to build native cubin for all selections.
# Ensure we build the PTX for the latest version.
# This behavior of adding a PTX (virtual) target for the highest architecture
# is similar to how the "all" and "all-major" options would behave in CMake >= 3.23.
# TODO: Consider bumping CMake requirement and using CMAKE_CUDA_ARCHITECTURES=[all | native] by default
list(REMOVE_DUPLICATES COMPUTE_CAPABILITY)
list(SORT COMPUTE_CAPABILITY COMPARE NATURAL)
list(POP_BACK COMPUTE_CAPABILITY _LATEST_CAPABILITY)
list(TRANSFORM COMPUTE_CAPABILITY APPEND "-real" OUTPUT_VARIABLE CMAKE_CUDA_ARCHITECTURES)
list(APPEND CMAKE_CUDA_ARCHITECTURES ${_LATEST_CAPABILITY})
message(STATUS "CUDA Targets: ${CMAKE_CUDA_ARCHITECTURES}")
message(STATUS "CUDA NVCC Flags: ${CMAKE_CUDA_FLAGS}")
list(APPEND SRC_FILES ${CUDA_FILES})
string(APPEND BNB_OUTPUT_NAME "_cuda${CUDA_VERSION_SHORT}")
if(NO_CUBLASLT)
string(APPEND BNB_OUTPUT_NAME "_nocublaslt")
endif()
add_compile_definitions(BUILD_CUDA)
elseif(BUILD_MPS)
if(NOT APPLE)
message(FATAL_ERROR "MPS is only supported on macOS" )
endif()
enable_language(OBJCXX)
list(APPEND SRC_FILES ${MPS_FILES})
string(APPEND BNB_OUTPUT_NAME "_mps")
add_compile_definitions(BUILD_MPS)
file(MAKE_DIRECTORY "build")
add_custom_command(OUTPUT "bitsandbytes/bitsandbytes.metallib"
COMMAND xcrun metal -c -o "build/bitsandbytes.air" ${METAL_FILES}
COMMAND xcrun metallib "build/bitsandbytes.air" -o "bitsandbytes/bitsandbytes.metallib"
DEPENDS "${METAL_FILES}"
COMMENT "Compiling Metal kernels"
VERBATIM)
add_custom_target(metallib DEPENDS "bitsandbytes/bitsandbytes.metallib")
else()
string(APPEND BNB_OUTPUT_NAME "_cpu")
set(GPU_SOURCES)
endif()
if(WIN32)
# Export all symbols
set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
endif()
if(MSVC)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /arch:AVX2 /fp:fast")
endif()
set_source_files_properties(${CPP_FILES} PROPERTIES LANGUAGE CXX)
add_library(bitsandbytes SHARED ${SRC_FILES})
target_compile_features(bitsandbytes PUBLIC cxx_std_14)
target_include_directories(bitsandbytes PUBLIC csrc include)
if(BUILD_CUDA)
target_include_directories(bitsandbytes PUBLIC ${CMAKE_CUDA_TOOLKIT_INCLUDE_DIRECTORIES})
target_link_libraries(bitsandbytes PUBLIC CUDA::cudart CUDA::cublas CUDA::cusparse)
if(NO_CUBLASLT)
target_compile_definitions(bitsandbytes PUBLIC NO_CUBLASLT)
else()
target_link_libraries(bitsandbytes PUBLIC CUDA::cublasLt)
endif()
set_target_properties(bitsandbytes
PROPERTIES
CUDA_SEPARABLE_COMPILATION ON
)
endif()
if(BUILD_MPS)
add_dependencies(bitsandbytes metallib)
target_link_libraries(bitsandbytes objc "-framework Foundation" "-framework Metal" "-framework MetalPerformanceShaders" "-framework MetalPerformanceShadersGraph")
endif()
if(WIN32)
set_target_properties(bitsandbytes PROPERTIES PREFIX "lib")
endif()
set_target_properties(bitsandbytes PROPERTIES OUTPUT_NAME ${BNB_OUTPUT_NAME})
if(MSVC)
set_target_properties(bitsandbytes PROPERTIES LIBRARY_OUTPUT_DIRECTORY_RELEASE "${PROJECT_SOURCE_DIR}/bitsandbytes")
set_target_properties(bitsandbytes PROPERTIES LIBRARY_OUTPUT_DIRECTORY_DEBUG "${PROJECT_SOURCE_DIR}/bitsandbytes")
set_target_properties(bitsandbytes PROPERTIES RUNTIME_OUTPUT_DIRECTORY_RELEASE "${PROJECT_SOURCE_DIR}/bitsandbytes")
set_target_properties(bitsandbytes PROPERTIES RUNTIME_OUTPUT_DIRECTORY_DEBUG "${PROJECT_SOURCE_DIR}/bitsandbytes")
endif()
set_target_properties(bitsandbytes PROPERTIES LIBRARY_OUTPUT_DIRECTORY "${PROJECT_SOURCE_DIR}/bitsandbytes")