Tests fail on 1-core machine

[bmwiedemann]

While working on reproducible builds for openSUSE, I found that our python-sidpy package fails tests on a 1-core VM

 tests/proc/test_comp_utils.py::TestParallelCompute::test_invalid_func_type PASSED [ 78%]
 tests/proc/test_comp_utils.py::TestParallelCompute::test_respect_requested_cores Number of CPU free cores set to: 1 given that the CPU has 1 logical cores.
 2 cores requested.
 Clipped explicit request for CPU cores to: 1
 computational jobs per core = 30. For short computations, each core must have at least 20 jobs to warrant parallel computation.
 Computations are not lengthy.
 Rank 0 starting computing on 1 cores (requested 2 cores)
 Rank 0 computing serially ...

jmcarpenter2/swifter#102 solved a similar issue by skipping such tests when not enough cores were available.

to reproduce on openSUSE or Debian:

osc co openSUSE:Factory/python-sidpy && cd $_
osc build --vm-type=kvm -j1 --noservice standard

Maybe the issue can also be triggered via taskset 1 pytest-3.8

[ssomnath]

@bmwiedemann - thank you for raising this issue. I have added appropriate safeguards for single core computations. We will be pushing out a new version with these fixes very soon.

May I ask why sidpy is being included in OpenSUSE?

[bmwiedemann]

May I ask why sidpy is being included in openSUSE?

I am not the maintainer, but think it is probably because of pyUSID

[ssomnath]

I see. Ok