Better motivates `cuda::device::is_address_from` by fbusato · Pull Request #5341 · NVIDIA/cccl

fbusato · 2025-07-22T22:36:37Z

Description

The PR better motivates the benefits of cuda::device::is_address_from compared to CUDA C functions.
Minors: fixes UB in the example and potential warnings in the code

github-actions · 2025-07-22T23:45:27Z

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  🟩 rtx2080            Pass: 100%/26  | Total:  2h 19m | Avg:  5m 21s | Max: 12m 29s | Hits:  99%/14684 
🟩 jobs
  🟩 Build              Pass: 100%/25  | Total:  2h 03m | Avg:  4m 57s | Max: 12m 29s | Hits:  99%/14073 
  🟩 Test               Pass: 100%/3   | Total: 25m 58s | Avg:  8m 39s | Max: 10m 33s | Hits:  99%/1833  
🟩 sm
  🟩 90                 Pass: 100%/2   | Total: 10m 39s | Avg:  5m 19s | Max:  7m 21s | Hits:  99%/1222  
  🟩 90;90a             Pass: 100%/2   | Total: 14m 39s | Avg:  7m 19s | Max: 10m 56s | Hits:  98%/922   
  🟩 100;120            Pass: 100%/2   | Total: 13m 58s | Avg:  6m 59s | Max: 10m 27s | Hits:  98%/922   
🟩 std
  🟩 17                 Pass: 100%/3   | Total: 13m 22s | Avg:  4m 27s | Max:  7m 19s | Hits:  99%/1831  
  🟩 20                 Pass: 100%/25  | Total:  2h 16m | Avg:  5m 27s | Max: 12m 29s | Hits:  99%/14075

🟩 python: Pass: 100%/22 | Total: 3h 41m | Avg: 10m 03s | Max: 19m 04s

🟩 cpu
  🟩 amd64              Pass: 100%/22  | Total:  3h 41m | Avg: 10m 03s | Max: 19m 04s
🟩 ctk
  🟩 12.5               Pass: 100%/6   | Total: 42m 27s | Avg:  7m 04s | Max: 13m 25s
  🟩 12.8               Pass: 100%/2   | Total: 37m 05s | Avg: 18m 32s | Max: 18m 44s
  🟩 12.9               Pass: 100%/14  | Total:  2h 21m | Avg: 10m 07s | Max: 19m 04s
🟩 cudacxx
  🟩 nvcc12.5           Pass: 100%/6   | Total: 42m 27s | Avg:  7m 04s | Max: 13m 25s
  🟩 nvcc12.8           Pass: 100%/2   | Total: 37m 05s | Avg: 18m 32s | Max: 18m 44s
  🟩 nvcc12.9           Pass: 100%/14  | Total:  2h 21m | Avg: 10m 07s | Max: 19m 04s
🟩 cudacxx_family
  🟩 nvcc               Pass: 100%/22  | Total:  3h 41m | Avg: 10m 03s | Max: 19m 04s
🟩 cxx
  🟩 GCC13              Pass: 100%/22  | Total:  3h 41m | Avg: 10m 03s | Max: 19m 04s
🟩 cxx_family
  🟩 GCC                Pass: 100%/22  | Total:  3h 41m | Avg: 10m 03s | Max: 19m 04s
🟩 gpu
  🟩 h100               Pass: 100%/4   | Total: 41m 32s | Avg: 10m 23s | Max: 16m 09s
  🟩 l4                 Pass: 100%/18  | Total:  2h 59m | Avg:  9m 59s | Max: 19m 04s
🟩 jobs
  🟩 Build cuda.cccl    Pass: 100%/2   | Total: 19m 14s | Avg:  9m 37s | Max:  9m 47s
  🟩 Test cuda.cccl.cooperative Pass: 100%/5   | Total:  1h 08m | Avg: 13m 38s | Max: 14m 56s
  🟩 Test cuda.cccl.examples Pass: 100%/5   | Total: 22m 22s | Avg:  4m 28s | Max:  5m 22s
  🟩 Test cuda.cccl.headers Pass: 100%/5   | Total: 20m 38s | Avg:  4m 07s | Max:  5m 05s
  🟩 Test cuda.cccl.parallel Pass: 100%/5   | Total:  1h 30m | Avg: 18m 11s | Max: 19m 04s
🟩 py_version
  🟩 3.10               Pass: 100%/9   | Total:  1h 30m | Avg: 10m 00s | Max: 18m 44s
  🟩 3.13               Pass: 100%/13  | Total:  2h 11m | Avg: 10m 06s | Max: 19m 04s

🟩 packaging: Pass: 100%/4 | Total: 11m 07s | Avg: 2m 46s | Max: 2m 56s

🟩 cpu
  🟩 amd64              Pass: 100%/4   | Total: 11m 07s | Avg:  2m 46s | Max:  2m 56s
🟩 ctk
  🟩 12.0               Pass: 100%/2   | Total:  5m 20s | Avg:  2m 40s | Max:  2m 56s
  🟩 12.9               Pass: 100%/2   | Total:  5m 47s | Avg:  2m 53s | Max:  2m 56s
🟩 cudacxx
  🟩 nvcc12.0           Pass: 100%/2   | Total:  5m 20s | Avg:  2m 40s | Max:  2m 56s
  🟩 nvcc12.9           Pass: 100%/2   | Total:  5m 47s | Avg:  2m 53s | Max:  2m 56s
🟩 cudacxx_family
  🟩 nvcc               Pass: 100%/4   | Total: 11m 07s | Avg:  2m 46s | Max:  2m 56s
🟩 cxx
  🟩 Clang14            Pass: 100%/1   | Total:  2m 56s | Avg:  2m 56s | Max:  2m 56s
  🟩 Clang19            Pass: 100%/1   | Total:  2m 56s | Avg:  2m 56s | Max:  2m 56s
  🟩 GCC12              Pass: 100%/1   | Total:  2m 24s | Avg:  2m 24s | Max:  2m 24s
  🟩 GCC13              Pass: 100%/1   | Total:  2m 51s | Avg:  2m 51s | Max:  2m 51s
🟩 cxx_family
  🟩 Clang              Pass: 100%/2   | Total:  5m 52s | Avg:  2m 56s | Max:  2m 56s
  🟩 GCC                Pass: 100%/2   | Total:  5m 15s | Avg:  2m 37s | Max:  2m 51s
🟩 gpu
  🟩 rtx2080            Pass: 100%/4   | Total: 11m 07s | Avg:  2m 46s | Max:  2m 56s
🟩 jobs
  🟩 Test               Pass: 100%/4   | Total: 11m 07s | Avg:  2m 46s | Max:  2m 56s

🟩 stdpar: Pass: 100%/4 | Total: 15m 32s | Avg: 3m 53s | Max: 3m 57s

🟩 cpu
  🟩 amd64              Pass: 100%/2   | Total:  7m 42s | Avg:  3m 51s | Max:  3m 55s
  🟩 arm64              Pass: 100%/2   | Total:  7m 50s | Avg:  3m 55s | Max:  3m 57s
🟩 ctk
  🟩 12.9               Pass: 100%/4   | Total: 15m 32s | Avg:  3m 53s | Max:  3m 57s
🟩 cudacxx
  🟩 nvcc12.9           Pass: 100%/4   | Total: 15m 32s | Avg:  3m 53s | Max:  3m 57s
🟩 cudacxx_family
  🟩 nvcc               Pass: 100%/4   | Total: 15m 32s | Avg:  3m 53s | Max:  3m 57s
🟩 cxx
  🟩 NVHPC25.5          Pass: 100%/4   | Total: 15m 32s | Avg:  3m 53s | Max:  3m 57s
🟩 cxx_family
  🟩 NVHPC              Pass: 100%/4   | Total: 15m 32s | Avg:  3m 53s | Max:  3m 57s
🟩 gpu
  🟩 rtx2080            Pass: 100%/4   | Total: 15m 32s | Avg:  3m 53s | Max:  3m 57s
🟩 jobs
  🟩 Build              Pass: 100%/4   | Total: 15m 32s | Avg:  3m 53s | Max:  3m 57s
🟩 std
  🟩 17                 Pass: 100%/2   | Total:  7m 48s | Avg:  3m 54s | Max:  3m 55s
  🟩 20                 Pass: 100%/2   | Total:  7m 44s | Avg:  3m 52s | Max:  3m 57s

🟩 cccl_c_parallel: Pass: 100%/3 | Total: 25m 57s | Avg: 8m 39s | Max: 14m 06s | Hits: 98%/495

🟩 cpu
  🟩 amd64              Pass: 100%/3   | Total: 25m 57s | Avg:  8m 39s | Max: 14m 06s | Hits:  98%/495   
🟩 ctk
  🟩 12.9               Pass: 100%/3   | Total: 25m 57s | Avg:  8m 39s | Max: 14m 06s | Hits:  98%/495   
🟩 cudacxx
  🟩 nvcc12.9           Pass: 100%/3   | Total: 25m 57s | Avg:  8m 39s | Max: 14m 06s | Hits:  98%/495   
🟩 cudacxx_family
  🟩 nvcc               Pass: 100%/3   | Total: 25m 57s | Avg:  8m 39s | Max: 14m 06s | Hits:  98%/495   
🟩 cxx
  🟩 GCC13              Pass: 100%/3   | Total: 25m 57s | Avg:  8m 39s | Max: 14m 06s | Hits:  98%/495   
🟩 cxx_family
  🟩 GCC                Pass: 100%/3   | Total: 25m 57s | Avg:  8m 39s | Max: 14m 06s | Hits:  98%/495   
🟩 gpu
  🟩 h100               Pass: 100%/1   | Total: 14m 06s | Avg: 14m 06s | Max: 14m 06s | Hits:  98%/165   
  🟩 rtx2080            Pass: 100%/2   | Total: 11m 51s | Avg:  5m 55s | Max:  9m 46s | Hits:  98%/330   
🟩 jobs
  🟩 Build              Pass: 100%/1   | Total:  2m 05s | Avg:  2m 05s | Max:  2m 05s | Hits:  98%/165   
  🟩 Test               Pass: 100%/2   | Total: 23m 52s | Avg: 11m 56s | Max: 14m 06s | Hits:  98%/330

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128	`linux-amd64-cpu16`
23	`windows-amd64-cpu16`
16	`linux-amd64-gpu-l4-latest-1`
12	`linux-arm64-cpu16`
11	`linux-amd64-gpu-rtx2080-latest-1`
10	`linux-amd64-gpu-h100-latest-1`
6	`linux-amd64-gpu-rtxa6000-latest-1`
3	`linux-amd64-gpu-rtx4090-latest-1`

davebayer

Thanks for clearing that up :)

davebayer · 2025-07-23T05:41:55Z

libcudacxx/include/cuda/__memory/address_space.h


-[[nodiscard]] _CCCL_FORCEINLINE _CCCL_VISIBILITY_HIDDEN _CCCL_DEVICE bool
-is_address_from(address_space __space, const void* __ptr)
+[[nodiscard]] _CCCL_DEVICE_API bool is_address_from(address_space __space, const void* __ptr)


Suggested change

[[nodiscard]] _CCCL_DEVICE_API bool is_address_from(address_space __space, const void* __ptr)

[[nodiscard]] _CCCL_DEVICE_API inline bool is_address_from(address_space __space, const void* __ptr)

fbusato · 2025-07-23T16:17:51Z

@davebayer Thanks again for the contribution! I needed to improve the documentation for this function. Its purpose will be clearer in a couple of months, but I can't talk about it publicly yet. :)

fbusato added 2 commits July 22, 2025 15:19

small fixes

25f05eb

improve documentation

2f3f72c

fbusato self-assigned this Jul 22, 2025

fbusato requested review from a team as code owners July 22, 2025 22:36

fbusato added this to CCCL Jul 22, 2025

fbusato added the 3.2.0 label Jul 22, 2025

fbusato requested review from gonidelis and griwes July 22, 2025 22:36

github-project-automation bot moved this to Todo in CCCL Jul 22, 2025

fbusato moved this from Todo to In Review in CCCL Jul 22, 2025

fbusato enabled auto-merge (squash) July 22, 2025 22:36

davebayer approved these changes Jul 23, 2025

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bernhardmgruber approved these changes Jul 23, 2025

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fbusato merged commit 7b59ead into NVIDIA:main Jul 23, 2025
221 checks passed

github-project-automation bot moved this from In Review to Done in CCCL Jul 23, 2025

davebayer pushed a commit to davebayer/cccl that referenced this pull request Sep 23, 2025

Better motivates cuda::device::is_address_from (NVIDIA#5341)

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Better motivates `cuda::device::is_address_from`#5341

Better motivates `cuda::device::is_address_from`#5341
fbusato merged 2 commits intoNVIDIA:mainfrom
fbusato:slightly-improve-is_address_from

fbusato commented Jul 22, 2025

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🟩 cub: Pass: 100%/50 | Total: 11h 40m | Avg: 14m 00s | Max: 1h 02m | Hits: 98%/51848

🟩 thrust: Pass: 100%/50 | Total: 8h 51m | Avg: 10m 37s | Max: 38m 12s | Hits: 99%/84139

🟩 libcudacxx: Pass: 100%/48 | Total: 9h 41m | Avg: 12m 07s | Max: 32m 08s | Hits: 93%/166873

🟩 cudax: Pass: 100%/28 | Total: 2h 29m | Avg: 5m 21s | Max: 12m 29s | Hits: 99%/15906

🟩 python: Pass: 100%/22 | Total: 3h 41m | Avg: 10m 03s | Max: 19m 04s

🟩 packaging: Pass: 100%/4 | Total: 11m 07s | Avg: 2m 46s | Max: 2m 56s

🟩 stdpar: Pass: 100%/4 | Total: 15m 32s | Avg: 3m 53s | Max: 3m 57s

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	[[nodiscard]] _CCCL_DEVICE_API bool is_address_from(address_space __space, const void* __ptr)
	[[nodiscard]] _CCCL_DEVICE_API inline bool is_address_from(address_space __space, const void* __ptr)

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fbusato commented Jul 22, 2025

Description

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🟩 cub: Pass: 100%/50 | Total: 11h 40m | Avg: 14m 00s | Max: 1h 02m | Hits: 98%/51848

🟩 thrust: Pass: 100%/50 | Total: 8h 51m | Avg: 10m 37s | Max: 38m 12s | Hits: 99%/84139

🟩 libcudacxx: Pass: 100%/48 | Total: 9h 41m | Avg: 12m 07s | Max: 32m 08s | Hits: 93%/166873

🟩 cudax: Pass: 100%/28 | Total: 2h 29m | Avg: 5m 21s | Max: 12m 29s | Hits: 99%/15906

🟩 python: Pass: 100%/22 | Total: 3h 41m | Avg: 10m 03s | Max: 19m 04s

🟩 packaging: Pass: 100%/4 | Total: 11m 07s | Avg: 2m 46s | Max: 2m 56s

🟩 stdpar: Pass: 100%/4 | Total: 15m 32s | Avg: 3m 53s | Max: 3m 57s

🟩 cccl_c_parallel: Pass: 100%/3 | Total: 25m 57s | Avg: 8m 39s | Max: 14m 06s | Hits: 98%/495

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