[Python-Dev] Python startup time (original) (raw)

Christian Heimes christian at python.org
Wed Oct 9 14:54:24 CEST 2013

Am 09.10.2013 14:39, schrieb Benjamin Peterson:

There's also the increasing number of modules (Python or otherwise) that have to be loaded on startup.

I have gathered some stats:

Python 3.4:

len(sys.modules) 56 len(list(name for name in sys.modules if name not in sys.builtin_module_names)) 36 sorted(sys.modules) ['main', '_codecs', '_collections', '_frozen_importlib', '_functools', '_heapq', '_imp', '_io', '_operator', '_sitebuiltins', '_sre', '_stat', '_sysconfigdata', '_thread', '_warnings', '_weakref', '_weakrefset', 'abc', 'atexit', 'builtins', 'codecs', 'collections', 'collections.abc', 'copyreg', 'encodings', 'encodings.aliases', 'encodings.latin_1', 'encodings.utf_8', 'errno', 'functools', 'genericpath', 'heapq', 'io', 'itertools', 'keyword', 'marshal', 'operator', 'os', 'os.path', 'posix', 'posixpath', 're', 'readline', 'reprlib', 'rlcompleter', 'signal', 'site', 'sre_compile', 'sre_constants', 'sre_parse', 'stat', 'sys', 'sysconfig', 'types', 'weakref', 'zipimport']

Python does quite alot of syscalls, too:

$ strace ./python -E -c '' 2>&1 | grep stat | wc -l 236 $ strace ./python -E -c '' 2>&1 | grep open | wc -l 53

Python 2.7 is a bit better:

len(sys.modules) 41 len(list(name for name in sys.modules if name not in sys.builtin_module_names)) 29

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