Fix slow test_patterngen_seeds on Windows by sampling #1461
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Andy-Jost
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/ok to test c48274e |
Andy-Jost
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Jan 12, 2026
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| @pytest.mark.skipif( |
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I could leave this in if we want to continue skipping this test on Windows. It is not important to test this on every platform IMO.
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The test runs in 0.19s on Linux. |
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rwgk
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Jan 12, 2026
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| @pytest.mark.skipif( |
cuda_core/tests/test_helpers.py
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| # especially on Windows. See https://github.com/NVIDIA/cuda-python/issues/1455 | ||
| pgen = PatternGen(device, NBYTES) | ||
| for i in range(256): | ||
| for i in range(0, 256, 17): |
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This isn't covering the usual trouble-maker corner case 1 anymore.
This would sample around the usual suspects (0, 1 corner case, then a couple around powers of 2):
(0, 1, 2, 3, 4, 5, 31, 32, 33, 127, 128, 129)
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OK, I included values <5 since those are the most common. I don't think there's anything special about powers of two in this case.
Replace exhaustive O(n²) pairwise seed testing with prime-stride sampling, reducing iterations from ~32k to ~100 while maintaining meaningful coverage. Closes NVIDIA#1455
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/ok to test d39f754 |
rwgk
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That looks nice!
>>> n = 0
>>> for i in (ii for ii in range(0, 256) if ii < 5 or ii % 17 == 0):
... js = tuple(jj for jj in range(i + 1, 256) if jj < 5 or jj % 19 == 0)
... print(i, js)
... n += len(js)
...
0 (1, 2, 3, 4, 19, 38, 57, 76, 95, 114, 133, 152, 171, 190, 209, 228, 247)
1 (2, 3, 4, 19, 38, 57, 76, 95, 114, 133, 152, 171, 190, 209, 228, 247)
2 (3, 4, 19, 38, 57, 76, 95, 114, 133, 152, 171, 190, 209, 228, 247)
3 (4, 19, 38, 57, 76, 95, 114, 133, 152, 171, 190, 209, 228, 247)
4 (19, 38, 57, 76, 95, 114, 133, 152, 171, 190, 209, 228, 247)
17 (19, 38, 57, 76, 95, 114, 133, 152, 171, 190, 209, 228, 247)
34 (38, 57, 76, 95, 114, 133, 152, 171, 190, 209, 228, 247)
51 (57, 76, 95, 114, 133, 152, 171, 190, 209, 228, 247)
68 (76, 95, 114, 133, 152, 171, 190, 209, 228, 247)
85 (95, 114, 133, 152, 171, 190, 209, 228, 247)
102 (114, 133, 152, 171, 190, 209, 228, 247)
119 (133, 152, 171, 190, 209, 228, 247)
136 (152, 171, 190, 209, 228, 247)
153 (171, 190, 209, 228, 247)
170 (171, 190, 209, 228, 247)
187 (190, 209, 228, 247)
204 (209, 228, 247)
221 (228, 247)
238 (247,)
255 ()
>>> print(n)
171
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/ok to test a4dcee1 |
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/ok to test d0454f2 |
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/ok to test f428279 |
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Summary
skipifIS_WINDOWSfortest_patterngen_seeds#1456, re-enabling the test on WindowsCloses #1455