Very slow test setup in pytest 4.2.0+ #4824
Description
Chainer and CuPy project use pytest.
I found a performance degradation in a particular version.
I run pytest --setuponly tests/chainer_tests > /dev/null command.
| pytest version | user time[sec] |
|---|---|
| 4.1.1 | 120.88 |
| 4.2.0 | 1872.78 |
I think that it is probably the influence of #4091 .
My environment
Python 2.7.13