atomicl 0.1.1

简介

类，该类允许原子地更新长值。 深受java的AtomicLong类和atomic包的启发。 使用Cython和 纯python回退可用（您不想使用它）。

示例：

>> counter = atomicl.AtomicLong()
>> counter += 2
>> counter.value
2
>> counter.get_and_set(5)
2
>> counter.value
5

与atomic

atomic是一个更成熟的库，经过了测试。

尽管api差别很小，但是atomic 并且atomicl是比较操作支持。atomicl有 不支持比较，目前，我不认为有理由 它。我倾向于同意Java的观点 this topic。

atomic由CFFI支持，这使它成为^{tt6}的一个不错的选择$ 和PyPy。atomicl使用Cython扩展获得更好的收益 在CPython上的性能较差，在PyPy上的性能较差。见 Benchmarks了解更多详细信息。

基准

操作系统x上的benchmarks.py的结果10.13.5具有 Intel(R) Core(TM) i5-5257U CPU @ 2.70GHz和涡轮增压已禁用：

Python 3.7.0：

# atomic / atomicl (Cython)
ctor_default: Mean +- std dev: [atomic.py37] 1.50 us +- 0.04 us -> [atomicl_cy.py37] 92.3 ns +- 0.9 ns: 16.25x faster (-94%)
ctor: Mean +- std dev: [atomic.py37] 1.40 us +- 0.02 us -> [atomicl_cy.py37] 109 ns +- 1 ns: 12.90x faster (-92%)
increment: Mean +- std dev: [atomic.py37] 515 ns +- 7 ns -> [atomicl_cy.py37] 33.3 ns +- 0.3 ns: 15.43x faster (-94%)
decrement: Mean +- std dev: [atomic.py37] 516 ns +- 6 ns -> [atomicl_cy.py37] 33.3 ns +- 0.2 ns: 15.51x faster (-94%)
setter: Mean +- std dev: [atomic.py37] 1.56 us +- 0.02 us -> [atomicl_cy.py37] 42.0 ns +- 0.6 ns: 37.05x faster (-97%)
cas: Mean +- std dev: [atomic.py37] 1.68 us +- 0.02 us -> [atomicl_cy.py37] 137 ns +- 1 ns: 12.30x faster (-92%)

# atomic / atomicl (Python)
ctor_default: Mean +- std dev: [atomic.py37] 1.50 us +- 0.04 us -> [atomicl_py.py37] 957 ns +- 17 ns: 1.57x faster (-36%)
ctor: Mean +- std dev: [atomic.py37] 1.40 us +- 0.02 us -> [atomicl_py.py37] 902 ns +- 17 ns: 1.56x faster (-36%)
increment: Mean +- std dev: [atomic.py37] 515 ns +- 7 ns -> [atomicl_py.py37] 980 ns +- 60 ns: 1.90x slower (+90%)
decrement: Mean +- std dev: [atomic.py37] 516 ns +- 6 ns -> [atomicl_py.py37] 970 ns +- 26 ns: 1.88x slower (+88%)
setter: Mean +- std dev: [atomic.py37] 1.56 us +- 0.02 us -> [atomicl_py.py37] 413 ns +- 12 ns: 3.77x faster (-73%)
cas: Mean +- std dev: [atomic.py37] 1.68 us +- 0.02 us -> [atomicl_py.py37] 1.03 us +- 0.01 us: 1.64x faster (-39%)

Python 3.4.6：

# atomic / atomicl (Cython)
ctor_default: Mean +- std dev: [atomic.py34] 1.64 us +- 0.06 us -> [atomicl_cy.py34] 74.5 ns +- 0.8 ns: 22.03x faster (-95%)
ctor: Mean +- std dev: [atomic.py34] 1.52 us +- 0.03 us -> [atomicl_cy.py34] 90.9 ns +- 1.1 ns: 16.71x faster (-94%)
increment: Mean +- std dev: [atomic.py34] 523 ns +- 20 ns -> [atomicl_cy.py34] 33.3 ns +- 0.3 ns: 15.70x faster (-94%)
decrement: Mean +- std dev: [atomic.py34] 522 ns +- 7 ns -> [atomicl_cy.py34] 33.6 ns +- 0.3 ns: 15.55x faster (-94%)
setter: Mean +- std dev: [atomic.py34] 1.42 us +- 0.04 us -> [atomicl_cy.py34] 44.0 ns +- 1.1 ns: 32.37x faster (-97%)
cas: Mean +- std dev: [atomic.py34] 1.54 us +- 0.03 us -> [atomicl_cy.py34] 118 ns +- 1 ns: 13.05x faster (-92%)

# atomic / atomicl (Python)
ctor_default: Mean +- std dev: [atomic.py34] 1.64 us +- 0.06 us -> [atomicl_py.py34] 982 ns +- 28 ns: 1.67x faster (-40%)
ctor: Mean +- std dev: [atomic.py34] 1.52 us +- 0.03 us -> [atomicl_py.py34] 912 ns +- 24 ns: 1.67x faster (-40%)
increment: Mean +- std dev: [atomic.py34] 523 ns +- 20 ns -> [atomicl_py.py34] 1.09 us +- 0.02 us: 2.09x slower (+109%)
decrement: Mean +- std dev: [atomic.py34] 522 ns +- 7 ns -> [atomicl_py.py34] 1.10 us +- 0.02 us: 2.11x slower (+111%)
setter: Mean +- std dev: [atomic.py34] 1.42 us +- 0.04 us -> [atomicl_py.py34] 456 ns +- 6 ns: 3.12x faster (-68%)
cas: Mean +- std dev: [atomic.py34] 1.54 us +- 0.03 us -> [atomicl_py.py34] 1.04 us +- 0.02 us: 1.48x faster (-33%)

PyPy 5.8.0-6.0.0：

# atomic / atomicl (Cython)
ctor_default: Mean +- std dev: [atomic.pypy3] 292 ns +- 7 ns -> [atomicl_cy.pypy3] 1.20 us +- 0.04 us: 4.10x slower (+310%)
ctor: Mean +- std dev: [atomic.pypy3] 270 ns +- 10 ns -> [atomicl_cy.pypy3] 1.13 us +- 0.03 us: 4.19x slower (+319%)
increment: Mean +- std dev: [atomic.pypy3] 27.9 ns +- 0.4 ns -> [atomicl_cy.pypy3] 68.4 ns +- 2.8 ns: 2.45x slower (+145%)
decrement: Mean +- std dev: [atomic.pypy3] 27.7 ns +- 0.1 ns -> [atomicl_cy.pypy3] 67.6 ns +- 1.0 ns: 2.44x slower (+144%)
setter: Mean +- std dev: [atomic.pypy3] 283 ns +- 5 ns -> [atomicl_cy.pypy3] 49.4 ns +- 1.3 ns: 5.73x faster (-83%)
cas: Mean +- std dev: [atomic.pypy3] 289 ns +- 6 ns -> [atomicl_cy.pypy3] 142 ns +- 7 ns: 2.03x faster (-51%)

# atomic / atomicl (Python)
ctor_default: Mean +- std dev: [atomic.pypy3] 292 ns +- 7 ns -> [atomicl_py.pypy3] 427 ns +- 12 ns: 1.46x slower (+46%)
ctor: Mean +- std dev: [atomic.pypy3] 270 ns +- 10 ns -> [atomicl_py.pypy3] 390 ns +- 10 ns: 1.44x slower (+44%)
increment: Mean +- std dev: [atomic.pypy3] 27.9 ns +- 0.4 ns -> [atomicl_py.pypy3] 274 ns +- 2 ns: 9.82x slower (+882%)
decrement: Mean +- std dev: [atomic.pypy3] 27.7 ns +- 0.1 ns -> [atomicl_py.pypy3] 283 ns +- 6 ns: 10.19x slower (+919%)
setter: Mean +- std dev: [atomic.pypy3] 283 ns +- 5 ns -> [atomicl_py.pypy3] 0.22 ns +- 0.00 ns: 1258.80x faster (-100%)
cas: Mean +- std dev: [atomic.pypy3] 289 ns +- 6 ns -> [atomicl_py.pypy3] 268 ns +- 3 ns: 1.08x faster (-7%)

许可证

麻省理工学院