CI test the future loky-3.3.0 branch

[ogrisel]

Let see if the fixed process management of loky make the joblib CI more stable.

[codecov]

Codecov Report

Base: 94.00% // Head: 93.88% // Decreases project coverage by -0.12% ⚠️

Coverage data is based on head (eaafe22) compared to base (067ed4f).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1338      +/-   ##
==========================================
- Coverage   94.00%   93.88%   -0.13%     
==========================================
  Files          52       52              
  Lines        7294     7293       -1     
==========================================
- Hits         6857     6847      -10     
- Misses        437      446       +9     

Impacted Files	Coverage Δ
joblib/test/test_memmapping.py	99.23% <100.00%> (-0.01%)	⬇️
joblib/test/testutils.py	50.00% <0.00%> (-50.00%)	⬇️
joblib/_parallel_backends.py	93.01% <0.00%> (-1.84%)	⬇️
joblib/memory.py	95.25% <0.00%> (-0.27%)	⬇️

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[ogrisel]

I pushed the second Trigger CI commit too early and wasted some CI time...

[ogrisel]

The flaky test_child_raises_parent_exits_cleanly observed above is being XFAILed in #1339 since I don't see an easy way to reproduce the problem locally to debug it. It's not impacting the default backend so I don't think fixing it is so high priority anyway.

[ogrisel]

Hum unfortunately, the new loky does not solve all the problems. We again got a low level crash on a macos run:

[...]
joblib/test/test_memmapping.py::test_multithreaded_parallel_termination_resource_tracker_silent PASSED [ 48%]
joblib/test/test_memmapping.py::test_many_parallel_calls_on_same_object[multiprocessing] continuous_integration/run_tests.sh: line 25:  6662 Terminated: 15          pytest joblib -vl --timeout=120 --junitxml="${JUNITXML}"
The STDIO streams did not close within 10 seconds of the exit event from process '/bin/bash'. This may indicate a child process inherited the STDIO streams and has not yet exited.