Fix thrust::uniform_int_distribution last 12-bits always being 0 #4393

gonidelis · 2025-04-09T22:50:09Z

fixes #758

Due to thrust::uniform_int_distribution relying on uniform_real_distribution the last 12-bits, as suggested in the tracking issue, are always 0. When I run the code from #758 (but with a full default_random_engine) I get output that looks like:

...
174c87445d321d00
37171a6adc5c6a00
bd4f637af53d9000
c674004319d0000
c0b13d9f02c4f800
cc428f1d310a4000
fa47ad89e91eb800
717b3fa7c5ed0000
e69896039a625800
dd6696cf759a5800
30ecb360c3b2ce0
9280a8c84a02a000
51d1ff8747480000
...

I am still not entirely sure why 3rd to last (even the 2nd in some rare cases) digit sometimes is not 0.

If a full engine is used the trailing zeros will (or at least should) be 3 and this PR fixes that by bit-manipulation. After calculating the base as before, we produce a new 12-bit uniformly random number that we add/append to the base. The result is a new uniformly random number.

Note

User needs to take care to use a proper engine. The code from the issue is using a 48-bit engine. That's why there are 4 trailing 0s, and not 3 as expected when I run the source from the issue with ranlux48. Detailed explanation in the comment under the issue.

...
4d283257ce8e0000
c9a90e6b5ff70000
44b01f0ccee50000
9723c9f4702a0000
603b1435411f0000
511e574a66b70000
ad200f0af9a10000
e2ea32f7f0010000
c04d33ea804e0000
9363937ffa6b0000
ec1867ba4e5c0000
86751aecd9780000
c37205ce33b70000
9ead0d2b22500000
...

djns99 · 2025-04-09T23:12:10Z

@gonidelis Thanks for this!

I am still not entirely sure why 3rd to last (even the 2nd in some rare cases) digit sometimes is not 0.

This will be the case where it produces a small value that can be represented accurately in the mantissa, notice there is an extra leading zero (omitted by the print) for that case

djns99 · 2025-04-09T23:14:11Z

thrust/thrust/random/detail/uniform_int_distribution.inl

+
+  // Add random lower bits to fix last 12-bits always being 0.
+  result_type lower_bits = static_cast<result_type>(urng()) & 0xFFF; // Get 12 **uniformly** random bits
+  return base | lower_bits; // Combine them


Is there a particular reason we use the real_dist, instead of using an algorithm that can directly generate integers.

Also won't this break for int distributions < 12 bits

Is there a particular reason we use the real_dist, instead of using an algorithm that can directly generate integers.

It's legacy, unfortunately I don't know.

Also won't this break for int distributions < 12 bits

yes, good catch. fixing it rn.

github-actions · 2025-04-10T03:48:26Z

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gonidelis · 2025-04-11T16:34:56Z

#4410 should fix the bugs mentioned above. The existing PR will alias the work in #4410 for thrust to expose a proper solution to the bug.

gonidelis added the bug Something isn't working right. label Apr 9, 2025

gonidelis requested a review from a team as a code owner April 9, 2025 22:50

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gonidelis requested review from alliepiper and miscco April 9, 2025 22:50

Fix thrust::uniform_int_distribution last 16bits always being 0 bug

9768035

gonidelis force-pushed the uniform_int_distr branch from 2a523e3 to 9768035 Compare April 9, 2025 22:53

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Fix thrust::uniform_int_distribution last 12-bits always being 0 #4393

Fix thrust::uniform_int_distribution last 12-bits always being 0 #4393

gonidelis commented Apr 9, 2025 •

edited

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djns99 commented Apr 9, 2025 •

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gonidelis Apr 9, 2025

github-actions bot commented Apr 10, 2025

🟨 thrust: Pass: 85%/47 | Total: 1d 02h | Avg: 33m 42s | Max: 1h 30m | Hits: 65%/71033

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gonidelis commented Apr 11, 2025

Fix thrust::uniform_int_distribution last 12-bits always being 0 #4393

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Fix thrust::uniform_int_distribution last 12-bits always being 0 #4393

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github-actions bot commented Apr 10, 2025

🟨 thrust: Pass: 85%/47 | Total: 1d 02h | Avg: 33m 42s | Max: 1h 30m | Hits: 65%/71033

🟨 cub: Pass: 89%/47 | Total: 20h 06m | Avg: 25m 40s | Max: 39m 05s | Hits: 96%/50400

🟩 stdpar: Pass: 100%/4 | Total: 22m 38s | Avg: 5m 39s | Max: 7m 36s

🟩 cccl_c_parallel: Pass: 100%/2 | Total: 27m 25s | Avg: 13m 42s | Max: 25m 10s | Hits: 98%/328

🟩 python: Pass: 100%/1 | Total: 1h 29m | Avg: 1h 29m | Max: 1h 29m

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🏃‍ Runner counts (total jobs: 101)

copy-pr-bot bot commented Apr 10, 2025

gonidelis commented Apr 11, 2025

gonidelis commented Apr 9, 2025 •

edited

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djns99 commented Apr 9, 2025 •

edited

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