New submission from STINNER Victor:
Attached PR replaces PyArg_ParseTupleAndKeywords() with
_PyArg_ParseTupleAndKeywordsFast() to optimize the constructor of the
builtin types:
* bool: bool_new()
* bytes: bytes_new()
* complex: complex_new()
* float: float_new()
* int: long_new()
* list: list_init()
* str: unicode_new()
* tuple: tuple_new()
When using keywords, the speedup is between 1.55x faster and 1.92x faster.
When using only positional arguments, the speedup is between 1.07x faster and
1.14x faster.
Results of attached bench.py:
+-----------------------------------------------+--------+---------------------+
| Benchmark | ref | changed |
+===============================================+========+=====================+
| complex(real=0.0, imag=0.0) | 452 ns | 1.92x faster (-48%) |
+-----------------------------------------------+--------+---------------------+
| bytes("x", encoding="ascii", errors="strict") | 498 ns | 1.88x faster (-47%) |
+-----------------------------------------------+--------+---------------------+
| str(b"x", encoding="ascii") | 340 ns | 1.55x faster (-35%) |
+-----------------------------------------------+--------+---------------------+
| list([None]) | 208 ns | 1.14x faster (-12%) |
+-----------------------------------------------+--------+---------------------+
| int(0) | 113 ns | 1.11x faster (-10%) |
+-----------------------------------------------+--------+---------------------+
| float(1.0) | 110 ns | 1.10x faster (-9%) |
+-----------------------------------------------+--------+---------------------+
| str("x") | 115 ns | 1.10x faster (-9%) |
+-----------------------------------------------+--------+---------------------+
| tuple((None,)) | 111 ns | 1.10x faster (-9%) |
+-----------------------------------------------+--------+---------------------+
| bytes(b"x") | 126 ns | 1.10x faster (-9%) |
+-----------------------------------------------+--------+---------------------+
| bool(True) | 107 ns | 1.09x faster (-8%) |
+-----------------------------------------------+--------+---------------------+
| complex(0.0, 0.0) | 176 ns | 1.07x faster (-7%) |
+-----------------------------------------------+--------+---------------------+
----------
files: bench.py
messages: 289111
nosy: haypo
priority: normal
severity: normal
status: open
title: Optimize builtin types constructor
type: performance
versions: Python 3.7
Added file: http://bugs.python.org/file46705/bench.py
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue29736>
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