INADA Naoki <[email protected]> added the comment:
$ ./python.patched -m perf timeit --compare-to ./python.master -s 'o="foo"'
'o.encode' --duplicate=10000
python.master: ..................... 23.1 ns +- 0.5 ns
python.patched: ..................... 24.6 ns +- 0.5 ns
Mean +- std dev: [python.master] 23.1 ns +- 0.5 ns -> [python.patched] 24.6 ns
+- 0.5 ns: 1.06x slower (+6%)
$ perf record ./python.patched -m perf timeit -s 'o="foo"' 'o.encode'
--duplicate=10000
Couldn't record kernel reference relocation symbol
Symbol resolution may be skewed if relocation was used (e.g. kexec).
Check /proc/kallsyms permission or run as root.
.....................
Mean +- std dev: 24.9 ns +- 0.7 ns
[ perf record: Woken up 9 times to write data ]
[kernel.kallsyms] with build id debb7f6ce8aad7263cc6564650a88db5c8003389 not
found, continuing without symbols
[ perf record: Captured and wrote 2.491 MB perf.data (61787 samples) ]
$ perf report | cat
(snip)
# Total Lost Samples: 0
#
# Samples: 61K of event 'cycles:ppp'
# Event count (approx.): 52880893198
#
# Overhead Command Shared Object
Symbol
# ........ .............. ................................................
..........................................
#
18.78% python.patched python.patched
[.] _PyEval_EvalFrameDefault
14.85% python.patched python.patched
[.] _PyObject_GenericGetAttrWithDict
9.93% python.patched python.patched
[.] PyCFunction_NewEx
8.56% python.patched python.patched
[.] _PyType_Lookup
6.61% python.patched python.patched
[.] meth_dealloc
4.12% python.patched python.patched
[.] PyParser_AddToken
3.36% python.patched python.patched
[.] PyObject_GetAttr
3.33% python.patched python.patched
[.] PyObject_GC_UnTrack
3.25% python.patched python.patched
[.] method_get
2.92% python.patched python.patched
[.] _Py_bytes_contains
2.13% python.patched python.patched
[.] freechildren
1.41% python.patched python.patched
[.] pymalloc_alloc.isra.6.part.7
----------
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<https://bugs.python.org/issue33930>
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