在 Python 中进行分析:谁调用了该函数?

问题描述

我正在使用 cProfile 在 Python 中进行分析.我发现了一个需要大量 CPU 时间的函数.我如何找出哪个函数最常调用这个重函数?

I'm profiling in Python using cProfile. I found a function that takes a lot of CPU time. How do I find out which function is calling this heavy function the most?

我会解决一个变通方法:我可以在那个沉重的函数中编写一行 Python 代码来打印调用它的函数的名称吗?

I'll settle for a workaround: Can I write a Python line inside that heavy function that will print the name of the function that called it?

推荐答案

这可能不会直接回答您的问题，但肯定会有所帮助.如果使用带有选项 --sort 累积的探查器，它将按累积时间对函数进行排序.这不仅有助于检测重函数，还有助于检测调用它们的函数.

That may not answer your question directly, but will definitely help. If use the profiler with option --sort cumulative it will sort the functions by cumulative time. Which is helpful to detect not only heavy functions but the functions that call them.

python -m cProfile --sort cumulative myScript.py

有一个获取调用者函数的解决方法:

There is a workaround to get the caller function:

import inspect
print inspect.getframeinfo(inspect.currentframe().f_back)[2]

您可以添加任意数量的 f_back，以防您想要来电者等如果你想计算频繁调用，你可以这样做:

You can add as many f_back as you want in case you want the caller caller etcIf you want to calculate frequent calls you can do this:

record = {}

caller = inspect.getframeinfo(inspect.currentframe().f_back)[2]
record[caller] = record.get(caller, 0) + 1

然后按频率顺序打印它们:

Then print them by order of frequency:

print sorted(record.items(), key=lambda a: a[1])

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