After a bit more investigation, the culprit is OpenSSL, in which there is the following code (in _utils.py which is imported from OpenSSL/__init__.py):
from cryptography.hazmat.bindings.openssl.binding import Binding
binding = Binding()
and this later Binding() instanciation is the one that takes almost 700ms.
And if we step forward, running:
import cProfile
cProfile.run('import OpenSSL', "OSSLstats")
import pstats
p=pstats.Stats('OSSLstats')
p.sort_stats('cumulative').print_stats(20)
Sun Dec 7 23:37:08 2014 OSSLstats
982856 function calls (963898 primitive calls) in 0.927 seconds
Ordered by: cumulative time
List reduced from 655 to 20 due to restriction <20>
ncalls tottime percall cumtime percall filename:lineno(function)
1 0.000 0.000 0.927 0.927 <string>:1(<module>)
1 0.001 0.001 0.927 0.927 __init__.py:6(<module>)
1 0.001 0.001 0.925 0.925 rand.py:5(<module>)
1 0.001 0.001 0.922 0.922 _util.py:1(<module>)
1 0.000 0.000 0.920 0.920 binding.py:88(__init__)
1 0.000 0.000 0.920 0.920
binding.py:91(_ensure_ffi_initialized)
1 0.000 0.000 0.920 0.920 utils.py:23(build_ffi)
1 0.000 0.000 0.862 0.862 api.py:90(cdef)
1 0.000 0.000 0.862 0.862 cparser.py:160(parse)
1 0.002 0.002 0.862 0.862 cparser.py:171(_internal_parse)
1 0.000 0.000 0.788 0.788 cparser.py:105(_parse)
1 0.000 0.000 0.747 0.747 c_parser.py:118(parse)
1 0.000 0.000 0.747 0.747 yacc.py:261(parse)
1 0.218 0.218 0.747 0.747 yacc.py:873(parseopt_notrack)
15098 0.012 0.000 0.179 0.000 c_lexer.py:76(token)
15098 0.073 0.000 0.167 0.000 lex.py:311(token)
1603 0.005 0.000 0.069 0.000 cparser.py:238(_parse_decl)
54251 0.065 0.000 0.065 0.000 {method 'match' of
'_sre.SRE_Pattern' objects}
2074 0.046 0.000 0.058 0.000 c_parser.py:1035(p_pointer)
72896 0.038 0.000 0.058 0.000 yacc.py:197(__getitem__)
So the time is spent by the _ensure_ffi_initialized class method (of the
Binding class) which
ends up by calling parseopt_notrack which is the slow stuff.
It seems that the time is spent parsing C code when executing
ffi.cdef("\n".join(cdef_sources)) (in cryptography/hazmat/bindings/utils.py
+57)
--
David DOUARD LOGILAB
Directeur du département Outils & Systèmes
+33 1 45 32 03 12 [email protected]
+33 1 83 64 25 26 http://www.logilab.fr/id/david.douard
Formations - http://www.logilab.fr/formations
Développements - http://www.logilab.fr/services
Gestion de connaissances - http://www.cubicweb.org/
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