TST: Cache available interactive backends #27422
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There are currently 7 backends, and this function is called 8 times during test collection. This means that `XOpenDisplay` would be called 56 times (multiplied by process count if using xdist). Locally, I'm seeing a deadlock after too many calls to `XOpenDisplay` during collection. While this is not directly our bug, it seems prudent to cut this down to only the one check per collection process. I don't think we can cache this globally, as one might want to re-try a GUI figure after starting an X server (e.g., over SSH or similar), without restarting Python/Matplotlib.
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timhoffm
approved these changes
Dec 2, 2023
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This fixes the collection failure for me as well. |
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PR summary
There are currently 7 backends, and this function is called 8 times during test collection. This means that
XOpenDisplaywould be called 56 times (multiplied by process count if using xdist).Locally, I'm seeing a deadlock after too many calls to
XOpenDisplayduring collection. While this is not directly our bug, it seems prudent to cut this down to only the one check per collection process.I don't think we can cache this globally, as one might want to re-try a GUI figure after starting an X server (e.g., over SSH or similar), without restarting Python/Matplotlib.
PR checklist