Make slowness warning for legend(loc="best") more accurate. #14894
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tacaswell
reviewed
Jul 26, 2019
... by actually timing the call duration. Locally I can best-locate legends even with plots with hundreds of thousands of points basically instantly, so the old warning was spurious. The new test is obviously a bit brittle because it depends on how fast the machine running it is. It's also slower than the test before (intentionally, because now you *actually* need a slow-to-place legend to trigger the warning). The warning is only emitted after the legend has been placed, but that seems fine -- if the best-placement is so slow that you ctrl-c the process, you'll have a traceback anyways. Also, spawning a separate thread to always emit the warning after exactly 5s will likely just make things worse performance-wise on average.
tacaswell
reviewed
Jul 26, 2019
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| if self._loc_used_default and time.perf_counter() - start_time > 1: | ||
| cbook._warn_external( | ||
| 'Creating legend with loc="best" can be slow with large ' |
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include the actual run time? Wish we could use the walrus here ;)
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would rather not, as if we do I'm fairly worried the next thing is that someone will ask for the warning threshold to be configurable and whatnot.
tacaswell
approved these changes
Jul 26, 2019
jklymak
approved these changes
Jul 26, 2019
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seems like a good idea |
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... by actually timing the call duration. Locally I can best-locate
legends even with plots with hundreds of thousands of points basically
instantly, so the old warning was spurious.
The new test is obviously a bit brittle because it depends on how fast
the machine running it is. It's also slower than the test before
(intentionally, because now you actually need a slow-to-place legend
to trigger the warning).
The warning is only emitted after the legend has been placed, but that
seems fine -- if the best-placement is so slow that you ctrl-c the
process, you'll have a traceback anyways. Also, spawning a separate
thread to always emit the warning after exactly 5s will likely just make
things worse performance-wise on average.
The 5s delay is the same as used in font_manager.py.
The original warning went in as #12455.
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