Merge pull request #22519 from jayfurmanek:nccl2_configure
PiperOrigin-RevId: 215310536
diff --git a/configure.py b/configure.py
index 0efa11a..7e47175 100644
--- a/configure.py
+++ b/configure.py
@@ -52,6 +52,10 @@
_TF_WORKSPACE_ROOT = ''
_TF_BAZELRC = ''
+NCCL_LIB_PATHS = [
+ 'lib64/', 'lib/powerpc64le-linux-gnu/', 'lib/x86_64-linux-gnu/', ''
+]
+
if platform.machine() == 'ppc64le':
_DEFAULT_TENSORRT_PATH_LINUX = '/usr/lib/powerpc64le-linux-gnu/'
else:
@@ -1097,7 +1101,7 @@
def set_tf_nccl_install_path(environ_cp):
- """Set NCCL_INSTALL_PATH and TF_NCCL_VERSION.
+ """Set NCCL_INSTALL_PATH, NCCL_HDR_PATH and TF_NCCL_VERSION.
Args:
environ_cp: copy of the os.environ.
@@ -1123,46 +1127,107 @@
if tf_nccl_version == '1':
break # No need to get install path, NCCL 1 is a GitHub repo.
- # TODO(csigg): Look with ldconfig first if we can find the library in paths
+ # Look with ldconfig first if we can find the library in paths
# like /usr/lib/x86_64-linux-gnu and the header file in the corresponding
# include directory. This is where the NCCL .deb packages install them.
- # Then ask the user if we should use that. Instead of a single
- # NCCL_INSTALL_PATH, pass separate NCCL_LIB_PATH and NCCL_HDR_PATH to
- # nccl_configure.bzl
- default_nccl_path = environ_cp.get('CUDA_TOOLKIT_PATH')
- ask_nccl_path = (r'Please specify the location where NCCL %s library is '
- 'installed. Refer to README.md for more details. [Default '
- 'is %s]:') % (tf_nccl_version, default_nccl_path)
- nccl_install_path = get_from_env_or_user_or_default(
- environ_cp, 'NCCL_INSTALL_PATH', ask_nccl_path, default_nccl_path)
- # Result returned from "read" will be used unexpanded. That make "~"
- # unusable. Going through one more level of expansion to handle that.
- nccl_install_path = os.path.realpath(os.path.expanduser(nccl_install_path))
- if is_windows() or is_cygwin():
- nccl_install_path = cygpath(nccl_install_path)
+ # First check to see if NCCL is in the ldconfig.
+ # If its found, use that location.
+ if is_linux():
+ ldconfig_bin = which('ldconfig') or '/sbin/ldconfig'
+ nccl2_path_from_ldconfig = run_shell([ldconfig_bin, '-p'])
+ nccl2_path_from_ldconfig = re.search('.*libnccl.so .* => (.*)',
+ nccl2_path_from_ldconfig)
+ if nccl2_path_from_ldconfig:
+ nccl2_path_from_ldconfig = nccl2_path_from_ldconfig.group(1)
+ if os.path.exists('%s.%s' % (nccl2_path_from_ldconfig, tf_nccl_version)):
+ nccl_install_path = os.path.dirname(nccl2_path_from_ldconfig)
+ print('NCCL libraries found in ' + nccl2_path_from_ldconfig)
- if is_windows():
- nccl_lib_path = 'lib/x64/nccl.lib'
- elif is_linux():
- nccl_lib_path = 'lib/libnccl.so.%s' % tf_nccl_version
- elif is_macos():
- nccl_lib_path = 'lib/libnccl.%s.dylib' % tf_nccl_version
+ # Check if this is the main system lib location
+ if re.search('.*linux-gnu', nccl_install_path):
+ trunc_nccl_install_path = '/usr'
+ print('This looks like a system path.')
+ else:
+ trunc_nccl_install_path = nccl_install_path + '/..'
- nccl_lib_path = os.path.join(nccl_install_path, nccl_lib_path)
- nccl_hdr_path = os.path.join(nccl_install_path, 'include/nccl.h')
- if os.path.exists(nccl_lib_path) and os.path.exists(nccl_hdr_path):
- # Set NCCL_INSTALL_PATH
- environ_cp['NCCL_INSTALL_PATH'] = nccl_install_path
- write_action_env_to_bazelrc('NCCL_INSTALL_PATH', nccl_install_path)
- break
+ # Look for header
+ nccl_hdr_path = trunc_nccl_install_path + '/include'
+ print('Assuming NCCL header path is ' + nccl_hdr_path)
+ if os.path.exists(nccl_hdr_path + '/nccl.h'):
+ # Set NCCL_INSTALL_PATH
+ environ_cp['NCCL_INSTALL_PATH'] = nccl_install_path
+ write_action_env_to_bazelrc('NCCL_INSTALL_PATH', nccl_install_path)
- # Reset and Retry
- print('Invalid path to NCCL %s toolkit, %s or %s not found. Please use the '
+ # Set NCCL_HDR_PATH
+ environ_cp['NCCL_HDR_PATH'] = nccl_hdr_path
+ write_action_env_to_bazelrc('NCCL_HDR_PATH', nccl_hdr_path)
+ break
+ else:
+ print(
+ 'The header for NCCL2 cannot be found. Please install the libnccl-dev package.'
+ )
+ else:
+ print('NCCL2 is listed by ldconfig but the library is not found. '
+ 'Your ldconfig is out of date. Please run sudo ldconfig.')
+ else:
+ # NCCL is not found in ldconfig. Ask the user for the location.
+ default_nccl_path = environ_cp.get('CUDA_TOOLKIT_PATH')
+ ask_nccl_path = (
+ r'Please specify the location where NCCL %s library is '
+ 'installed. Refer to README.md for more details. [Default '
+ 'is %s]:') % (tf_nccl_version, default_nccl_path)
+ nccl_install_path = get_from_env_or_user_or_default(
+ environ_cp, 'NCCL_INSTALL_PATH', ask_nccl_path, default_nccl_path)
+
+ # Result returned from "read" will be used unexpanded. That make "~"
+ # unusable. Going through one more level of expansion to handle that.
+ nccl_install_path = os.path.realpath(
+ os.path.expanduser(nccl_install_path))
+ if is_windows() or is_cygwin():
+ nccl_install_path = cygpath(nccl_install_path)
+
+ if is_windows():
+ nccl_lib_path = 'lib/x64/nccl.lib'
+ elif is_linux():
+ nccl_lib_filename = 'libnccl.so.%s' % tf_nccl_version
+ nccl_lpath = '%s/lib/%s' % (nccl_install_path, nccl_lib_filename)
+ if not os.path.exists(nccl_lpath):
+ for relative_path in NCCL_LIB_PATHS:
+ path = '%s/%s%s' % (nccl_install_path, relative_path,
+ nccl_lib_filename)
+ if os.path.exists(path):
+ print('NCCL found at ' + path)
+ nccl_lib_path = path
+ break
+ else:
+ nccl_lib_path = nccl_lpath
+ elif is_macos():
+ nccl_lib_path = 'lib/libnccl.%s.dylib' % tf_nccl_version
+
+ nccl_lib_path = os.path.join(nccl_install_path, nccl_lib_path)
+ nccl_hdr_path = os.path.join(
+ os.path.dirname(nccl_lib_path), '../include/nccl.h')
+ print('Assuming NCCL header path is ' + nccl_hdr_path)
+ if os.path.exists(nccl_lib_path) and os.path.exists(nccl_hdr_path):
+ # Set NCCL_INSTALL_PATH
+ environ_cp['NCCL_INSTALL_PATH'] = os.path.dirname(nccl_lib_path)
+ write_action_env_to_bazelrc('NCCL_INSTALL_PATH',
+ os.path.dirname(nccl_lib_path))
+
+ # Set NCCL_HDR_PATH
+ environ_cp['NCCL_HDR_PATH'] = os.path.dirname(nccl_hdr_path)
+ write_action_env_to_bazelrc('NCCL_HDR_PATH',
+ os.path.dirname(nccl_hdr_path))
+ break
+
+ # Reset and Retry
+ print(
+ 'Invalid path to NCCL %s toolkit, %s or %s not found. Please use the '
'O/S agnostic package of NCCL 2' % (tf_nccl_version, nccl_lib_path,
nccl_hdr_path))
- environ_cp['TF_NCCL_VERSION'] = ''
+ environ_cp['TF_NCCL_VERSION'] = ''
else:
raise UserInputError('Invalid TF_NCCL setting was provided %d '
'times in a row. Assuming to be a scripting mistake.' %