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# Find the nccl libraries
#
# The following variables are optionally searched for defaults
# NCCL_ROOT: Base directory where all NCCL components are found
# NCCL_INCLUDE_DIR: Directory where NCCL header is found
# NCCL_LIB_DIR: Directory where NCCL library is found
#
# The following are set after configuration is done:
# NCCL_FOUND
# NCCL_INCLUDE_DIRS
# NCCL_LIBRARIES
#
# Adapted from https://github.com/pytorch/pytorch/blob/master/cmake/Modules/FindNCCL.cmake
set(NCCL_INCLUDE_DIR $ENV{NCCL_INCLUDE_DIR} CACHE PATH "Folder contains NVIDIA NCCL headers")
set(NCCL_LIB_DIR $ENV{NCCL_LIB_DIR} CACHE PATH "Folder contains NVIDIA NCCL libraries")
set(_NCCL_VERSION $ENV{NCCL_VERSION} CACHE STRING "Version of NCCL to build with")
list(APPEND NCCL_ROOT $ENV{NCCL_ROOT_DIR} ${CUDA_TOOLKIT_ROOT_DIR})
# Compatible layer for CMake <3.12. NCCL_ROOT will be accounted in for searching paths and libraries for CMake >=3.12.
list(APPEND CMAKE_PREFIX_PATH ${NCCL_ROOT})
find_path(NCCL_INCLUDE_DIRS
NAMES nccl.h
HINTS
${NCCL_INCLUDE_DIR}
$ENV{CUDNN_ROOT_DIR}
$ENV{CUDA_PATH}
$ENV{CUDNN_ROOT_DIR}
$ENV{CUDA_TOOLKIT_ROOT_DIR}
$ENV{NCCL}
/usr/include
PATH_SUFFIXES
include
)
if (USE_STATIC_NCCL)
MESSAGE(STATUS "USE_STATIC_NCCL is set. Linking with static NCCL library.")
SET(NCCL_LIBNAME "nccl_static")
if (_NCCL_VERSION) # Prefer the versioned library if a specific NCCL version is specified
set(CMAKE_FIND_LIBRARY_SUFFIXES ".a.${_NCCL_VERSION}" ${CMAKE_FIND_LIBRARY_SUFFIXES})
endif()
else()
SET(NCCL_LIBNAME "nccl")
if (_NCCL_VERSION) # Prefer the versioned library if a specific NCCL version is specified
set(CMAKE_FIND_LIBRARY_SUFFIXES ".so.${_NCCL_VERSION}" ${CMAKE_FIND_LIBRARY_SUFFIXES})
endif()
endif()
# Read version from header
if(EXISTS "${NCCL_INCLUDE_DIRS}/nccl.h")
file(READ ${NCCL_INCLUDE_DIRS}/nccl.h NCCL_HEADER_CONTENTS)
endif()
if(NCCL_HEADER_CONTENTS)
string(REGEX MATCH "define NCCL_MAJOR * +([0-9]+)"
_NCCL_VERSION_MAJOR "${NCCL_HEADER_CONTENTS}")
string(REGEX REPLACE "define NCCL_MAJOR * +([0-9]+)" "\\1"
_NCCL_VERSION_MAJOR "${_NCCL_VERSION_MAJOR}")
string(REGEX MATCH "define NCCL_MINOR * +([0-9]+)"
_NCCL_VERSION_MINOR "${NCCL_HEADER_CONTENTS}")
string(REGEX REPLACE "define NCCL_MINOR * +([0-9]+)" "\\1"
_NCCL_VERSION_MINOR "${_NCCL_VERSION_MINOR}")
string(REGEX MATCH "define NCCL_PATCH * +([0-9]+)"
_NCCL_VERSION_PATCH "${NCCL_HEADER_CONTENTS}")
string(REGEX REPLACE "define NCCL_PATCH * +([0-9]+)" "\\1"
_NCCL_VERSION_PATCH "${_NCCL_VERSION_PATCH}")
if(NOT _NCCL_VERSION_MAJOR)
set(_NCCL_VERSION "?")
else()
set(_NCCL_VERSION "${_NCCL_VERSION_MAJOR}.${_NCCL_VERSION_MINOR}.${_NCCL_VERSION_PATCH}")
endif()
endif()
find_library(NCCL_LIBRARIES
NAMES ${NCCL_LIBNAME}
HINTS
${NCCL_LIB_DIR}
${CUDA_TOOLKIT_ROOT}
$ENV{CUDA_PATH}
$ENV{CUDNN_ROOT_DIR}
$ENV{CUDA_TOOLKIT_ROOT_DIR}
$ENV{NCCL}
/usr/lib/x86_64-linux-gnu/
PATH_SUFFIXES
lib
lib64
)
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(NCCL
REQUIRED_VARS NCCL_INCLUDE_DIRS NCCL_LIBRARIES
VERSION_VAR _NCCL_VERSION)
if(NCCL_FOUND) # obtaining NCCL version and some sanity checks
message(STATUS "Found NCCL ${_NCCL_VERSION} (include: ${NCCL_INCLUDE_DIRS}, library: ${NCCL_LIBRARIES})")
mark_as_advanced(NCCL_ROOT_DIR NCCL_INCLUDE_DIRS NCCL_LIBRARIES NCCL_VERSION)
endif()
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