cython/cython

Python wrappers are not profiled separately when binding=True

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#2,137 建立於 2018年3月10日

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Code Generationdefectgood first issuehelp wanted

描述

Cython 0.27.3, Python 3.6.3.

#cython: binding=True, profile=True

cpdef f(x):
    if x > 0:
        f(x - 1)

>>> cProfile.run("for i in range(5): proftest.f(2)")
         23 function calls (8 primitive calls) in 0.000 seconds

   Ordered by: standard name

       ncalls  tottime  percall  cumtime  percall filename:lineno(function)
            1    0.000    0.000    0.000    0.000 <string>:1(<module>)
         20/5    0.000    0.000    0.000    0.000 proftest.pyx:3(f)
            1    0.000    0.000    0.000    0.000 {built-in method builtins.exec}
            1    0.000    0.000    0.000    0.000 {method 'disable' of '_lsprof.Profiler' objects}

By comparison, with binding=False (the default):

>>> cProfile.run("for i in range(5): proftest.f(2)")
         28 function calls (18 primitive calls) in 0.000 seconds

   Ordered by: standard name

       ncalls  tottime  percall  cumtime  percall filename:lineno(function)
            1    0.000    0.000    0.000    0.000 <string>:1(<module>)
            5    0.000    0.000    0.000    0.000 proftest.pyx:3(f (wrapper))
         15/5    0.000    0.000    0.000    0.000 proftest.pyx:3(f)
            1    0.000    0.000    0.000    0.000 {built-in method builtins.exec}
            5    0.000    0.000    0.000    0.000 {built-in method proftest.f}
            1    0.000    0.000    0.000    0.000 {method 'disable' of '_lsprof.Profiler' objects}

貢獻者指南

技術棧
python
領域
performance
議題類型
bug
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
3
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
1-3 hours
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
stale
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
Understanding of Cython's binding optionFamiliarity with Python cProfile
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
30
研究方向
Investigate the Cython compiler's code generation for cpdef functions when binding=True. Focus on how the profiling hooks are emitted for wrapper functions. Compare with the binding=False case where wrappers are profiled separately. Look at the Cython source files related to code generation, likely in the 'Cython/Compiler' directory. Consider examining the generated C code and the logic that adds profiling entries. The goal is to ensure that when binding=True, the wrapper function appears as a separate entry in the profile output.