我可以在 pytest 测试上运行 line_profiler 吗? [英] Can I run line_profiler over a pytest test?

问题描述

我用

py.test --durations=10

我现在想用 line_profiler 或 cprofile 之类的东西来检测其中一个测试.我真的很想从测试本身获取配置文件数据，因为 pytest 设置或拆除很可能是缓慢的一部分.

I would like to instrument one of those tests now with something like line_profiler or cprofile. I really want to get the profile data from the test itself as the pytest setup or tear down could well be part of what is slow.

然而，考虑到 line_profiler 或 cprofile 通常如何参与，我不清楚如何让它们与 pytest 一起工作.

However given how line_profiler or cprofile is typically involved it isn't clear to me how to make them work with pytest.

推荐答案

像这样运行 pytest:

Run pytest like this:

python3 -m cProfile -o profile -m pytest

您甚至可以传入可选参数:

You can even pass in optional arguments:

python3 -m cProfile -o profile -m pytest tests/worker/test_tasks.py -s campaigns

这将在您的当前目录中创建一个名为 profile 的二进制文件.这可以通过 pstats 进行分析:

This will create a binary file called profile in your current directory. This can be analyzed with pstats:

import pstats
p = pstats.Stats('profile')
p.strip_dirs()
p.sort_stats('cumtime')
p.print_stats(50)

这将打印累积持续时间最长的 50 行.

This will print the 50 lines with the longest cumulative duration.

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