Test suite can fail if run in parallel about firedrake

[kynan]

Is this when running with py.test -n ${THREADS}? I believe your original suggestion of using py.test py.test -d --tx ${THREADS}*popen would fix that issue.

[wence-]

Those two forms are entirely equivalent.

[kynan]

Then I'm not sure under which circumstances this issue might occur.

[wence-]

The tests get farmed out to the subprocesses. Afaict, I was occasionally seeing failures because the check for uninitialised was being load-balanced to a subprocess which had already run another test. But I haven't been able to reproduce.

[kynan]

I think the pytest test collection is deterministic, so that shouldn't happen. Let's leave this open until we're more confident it doesn't happen.

[wence-]

I haven't seen this again, so closing.