[issue28716] Fractions instantiation revisited

[Wolfgang Maier]

Wolfgang Maier added the comment:

sure, I just happened to have the profiling available since I used it to optimize things. Here's similar microbenchmarks using perf:

STRINGS
=======

$ python -m perf timeit -s "from fractions import Fraction" "Fraction('1.23456e-7')"
.....................
Median +- std dev: 17.0 us +- 0.3 us

$ python -m perf timeit -s "from frc import Fraction" "Fraction('1.23456e-7')"
.....................
Median +- std dev: 8.95 us +- 0.16 us


$ python -m perf timeit -s "from fractions import Fraction" "Fraction('234/567')"
.....................
Median +- std dev: 12.6 us +- 0.1 us

$ python -m perf timeit -s "from frc import Fraction" "Fraction('234/567')"
.....................
Median +- std dev: 5.45 us +- 0.16 us


$ python -m perf timeit -s "from fractions import Fraction" "Fraction('123456')"
.....................
Median +- std dev: 12.4 us +- 0.6 us

$ python -m perf timeit -s "from frc import Fraction" "Fraction('123456')"
.....................
Median +- std dev: 5.77 us +- 0.12 us


$ python -m perf timeit -s "from fractions import Fraction; f=Fraction(3/4)" "Fraction(f)"
.....................
Median +- std dev: 4.36 us +- 0.06 us

$ python -m perf timeit -s "from frc import Fraction; f=Fraction(3/4)" "Fraction(f)"
.....................
Median +- std dev: 4.59 us +- 0.07 us


$ python -m perf timeit -s "from fractions import Fraction" -s "class myInt(int): pass" -s "i=myInt(123456)" "Fraction(i)"
.....................
Median +- std dev: 4.04 us +- 0.07 us

$ python -m perf timeit -s "from frc import Fraction" -s "class myInt(int): pass" -s "i=myInt(123456)" "Fraction(i)"
.....................
Median +- std dev: 4.27 us +- 0.06 us


FLOATS
======

$ python -m perf timeit -s "from fractions import Fraction" "Fraction(1.23456e-7)"
.....................
Median +- std dev: 6.30 us +- 0.28 us

$ python -m perf timeit -s "from frc import Fraction" "Fraction(1.23456e-7)"
.....................
Median +- std dev: 8.64 us +- 0.13 us


$ python -m perf timeit -s "from fractions import Fraction" "Fraction.from_float(1.23456e-7)"
.....................
Median +- std dev: 8.68 us +- 0.14 us

$ python -m perf timeit -s "from frc import Fraction" "Fraction.from_float(1.23456e-7)"
.....................
Median +- std dev: 3.37 us +- 0.17 us


DECIMALS (using C implementation this time)
===========================================

$ python -m perf timeit -s "from fractions import Fraction; from decimal import Decimal; d=Decimal('123456')" "Fraction(d)".....................
Median +- std dev: 6.95 us +- 0.21 us

$ python -m perf timeit -s "from frc import Fraction; from decimal import Decimal; d=Decimal('123456')" "Fraction(d)"
.....................
Median +- std dev: 8.43 us +- 0.17 us


$ python -m perf timeit -s "from fractions import Fraction; from decimal import Decimal; d=Decimal('123456')" "Fraction.from_decimal(d)"
.....................
Median +- std dev: 11.6 us +- 0.2 us

$ python -m perf timeit -s "from frc import Fraction; from decimal import Decimal; d=Decimal('123456')" "Fraction.from_decimal(d)"
.....................
Median +- std dev: 4.14 us +- 0.28 us

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28716>
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