problem with coverage stats when using multiprocessing

[franklingu]

I am using multiprocessing.Process in some file. When I run test just for that file, seems the coverage data is OK.

py.test --cov=data_utils --cov-report=html -vv -s  tests/test_utils_multiprocessing.py

And data:

Coverage for data_utils/utils/_multiprocessing.py : 95% Show keyboard shortcuts
85 statements 81 run 4 missing 0 excluded

But when I run test for whole tests directory the coverage for _multiprocessing.py and tests run after that dropped a lot -- compared to when being run in single file.

py.test --cov=data_utils --cov-report=html -vv -s

Coverage for data_utils/utils/_multiprocessing.py : 47% Show keyboard shortcuts
85 statements 40 run 45 missing 0 excluded

I am using Python 3.6.1 and pytest==3.4.2, pytest-cov==2.5.1,pytest-forked==0.2,pytest-mock==1.7.1 on ubuntu 16.04. I looked at #139 and I think this is not the same issue. The coverage is OK if run single test file but is too low if run the whole directory

[haroune-mohammedi]

I'm having a similar issue with multiprocessing support, have you fixed yours @franklingu ?

[ionelmc]

Multiprocessing support was completely removed. See https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst#400-2022-09-28 for migration path to coveragepy's builtin mp support.

[thomascousindech]

Sorry to reopen an old topic, but rather than being explained in the CHANGELOG, shouldn't the documentation be updated with the proposed fix? At the moment, the documentation is confusing as it still looks like multiprocessing is handled, even though it's not.