[9.0] test: Pin histogram bins so plot references don't depend on numpy - #8754
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fstagni merged 1 commit intoAug 28, 2026
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The number of bins chosen by the default "bins=auto" comes from numpy, and numpy 2.1 changed the heuristic: [2, 2, 3, 4, 5, 5] is split into 4 bins by numpy 1.x but 3 bins by numpy >= 2.1. The matplotlib 3.11 reference images for histogram1 and histogram2 were generated with numpy 2, so they could never match DIRACOS, which pins numpy < 2 for elasticsearch < 7.14. Ask for an explicit number of bins for those two plots instead. The values are the ones "auto" picks with numpy 1.x, so the plots are unchanged and the existing pre-3.11 references stay valid; only the two matplotlib 3.11 references needed regenerating. histogram3 keeps "auto": it is the only shape used in production (see JobPlotter._plotHistogramCPUUsed) and it bins identically under both numpy versions. Test_Plots.py passes 8/8 on numpy 1.26.4 + matplotlib 3.11.1 (the DIRACOS stack), numpy 2.4.6 + matplotlib 3.11.1, and numpy 1.26.4 + matplotlib 3.10.9.
chrisburr
marked this pull request as ready for review
August 27, 2026 13:41
fstagni
approved these changes
Aug 28, 2026
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Forward port of #8753