Blackwell cluster-level work-stealing by gonzalobg · Pull Request #3908 · NVIDIA/cccl

gonzalobg · 2025-02-22T13:14:06Z

Description

This PR extends the work-stealing APIs with for_each_canceled_cluster to enable cluster-level work stealing (see work-stealing tracking issue: #3870).

It improves the example to show prologue and epilogue reuse, and moves the example to the examples directory so that it can be tested.

We should probably explore whether we actually need two APIs, or whether for_each_canceled_block could internally detect a cluster and just internally switch to do cluster-level work stealing. Exploring this is tracked in #3870.

Checklist

I am familiar with the Contributing Guidelines. -->
New or existing tests cover these changes.
The documentation is up to date with these changes.

copy-pr-bot · 2025-02-22T13:14:10Z

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gonzalobg · 2025-02-22T13:14:24Z

pre-commit.ci autofix

bernhardmgruber · 2025-02-23T22:01:29Z

pre-commit.ci autofix

bernhardmgruber · 2025-02-23T22:02:52Z

/ok to test

github-actions · 2025-02-23T23:13:00Z

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  🟩 Clang              Pass: 100%/8   | Total: 34m 54s | Avg:  4m 21s | Max: 11m 49s | Hits:  99%/4458  
  🟩 GCC                Pass: 100%/10  | Total: 53m 35s | Avg:  5m 21s | Max: 14m 07s | Hits:  99%/5572  
  🟩 MSVC               Pass: 100%/2   | Total: 18m 41s | Avg:  9m 20s | Max:  9m 42s | Hits:  61%/524   
  🟩 NVHPC              Pass: 100%/2   | Total: 10m 15s | Avg:  5m 07s | Max:  5m 12s | Hits:  96%/710   
🟩 gpu
  🟩 h100               Pass: 100%/2   | Total: 17m 18s | Avg:  8m 39s | Max: 13m 48s | Hits:  98%/1114  
  🟩 rtx2080            Pass: 100%/20  | Total:  1h 40m | Avg:  5m 00s | Max: 14m 07s | Hits:  97%/10150 
🟩 jobs
  🟩 Build              Pass: 100%/19  | Total:  1h 17m | Avg:  4m 05s | Max:  9m 42s | Hits:  97%/9593  
  🟩 Test               Pass: 100%/3   | Total: 39m 44s | Avg: 13m 14s | Max: 14m 07s | Hits:  99%/1671  
🟩 sm
  🟩 90                 Pass: 100%/3   | Total: 20m 52s | Avg:  6m 57s | Max: 13m 48s | Hits:  98%/1671  
  🟩 90a                Pass: 100%/1   | Total:  2m 58s | Avg:  2m 58s | Max:  2m 58s | Hits:  99%/557   
🟩 std
  🟩 17                 Pass: 100%/4   | Total: 14m 43s | Avg:  3m 40s | Max:  5m 03s | Hits:  98%/2026  
  🟩 20                 Pass: 100%/18  | Total:  1h 42m | Avg:  5m 42s | Max: 14m 07s | Hits:  97%/9238

🟩 cccl_c_parallel: Pass: 100%/2 | Total: 15m 09s | Avg: 7m 34s | Max: 12m 46s | Hits: 98%/308

🟩 cpu
  🟩 amd64              Pass: 100%/2   | Total: 15m 09s | Avg:  7m 34s | Max: 12m 46s | Hits:  98%/308   
🟩 ctk
  🟩 12.8               Pass: 100%/2   | Total: 15m 09s | Avg:  7m 34s | Max: 12m 46s | Hits:  98%/308   
🟩 cudacxx
  🟩 nvcc12.8           Pass: 100%/2   | Total: 15m 09s | Avg:  7m 34s | Max: 12m 46s | Hits:  98%/308   
🟩 cudacxx_family
  🟩 nvcc               Pass: 100%/2   | Total: 15m 09s | Avg:  7m 34s | Max: 12m 46s | Hits:  98%/308   
🟩 cxx
  🟩 GCC13              Pass: 100%/2   | Total: 15m 09s | Avg:  7m 34s | Max: 12m 46s | Hits:  98%/308   
🟩 cxx_family
  🟩 GCC                Pass: 100%/2   | Total: 15m 09s | Avg:  7m 34s | Max: 12m 46s | Hits:  98%/308   
🟩 gpu
  🟩 rtx2080            Pass: 100%/2   | Total: 15m 09s | Avg:  7m 34s | Max: 12m 46s | Hits:  98%/308   
🟩 jobs
  🟩 Build              Pass: 100%/1   | Total:  2m 23s | Avg:  2m 23s | Max:  2m 23s | Hits:  98%/154   
  🟩 Test               Pass: 100%/1   | Total: 12m 46s | Avg: 12m 46s | Max: 12m 46s | Hits:  98%/154

🟩 python: Pass: 100%/1 | Total: 40m 15s | Avg: 40m 15s | Max: 40m 15s

🟩 cpu
  🟩 amd64              Pass: 100%/1   | Total: 40m 15s | Avg: 40m 15s | Max: 40m 15s
🟩 ctk
  🟩 12.8               Pass: 100%/1   | Total: 40m 15s | Avg: 40m 15s | Max: 40m 15s
🟩 cudacxx
  🟩 nvcc12.8           Pass: 100%/1   | Total: 40m 15s | Avg: 40m 15s | Max: 40m 15s
🟩 cudacxx_family
  🟩 nvcc               Pass: 100%/1   | Total: 40m 15s | Avg: 40m 15s | Max: 40m 15s
🟩 cxx
  🟩 GCC13              Pass: 100%/1   | Total: 40m 15s | Avg: 40m 15s | Max: 40m 15s
🟩 cxx_family
  🟩 GCC                Pass: 100%/1   | Total: 40m 15s | Avg: 40m 15s | Max: 40m 15s
🟩 gpu
  🟩 rtx2080            Pass: 100%/1   | Total: 40m 15s | Avg: 40m 15s | Max: 40m 15s
🟩 jobs
  🟩 Test               Pass: 100%/1   | Total: 40m 15s | Avg: 40m 15s | Max: 40m 15s

👃 Inspect Changes

Modifications in project?

	Project
	CCCL Infrastructure
+/-	libcu++
	CUB
	Thrust
	CUDA Experimental
	python
	CCCL C Parallel Library
	Catch2Helper

Modifications in project or dependencies?

	Project
	CCCL Infrastructure
+/-	libcu++
+/-	CUB
+/-	Thrust
+/-	CUDA Experimental
+/-	python
+/-	CCCL C Parallel Library
+/-	Catch2Helper

🏃‍ Runner counts (total jobs: 158)

#	Runner
111	`linux-amd64-cpu16`
15	`windows-amd64-cpu16`
10	`linux-arm64-cpu16`
8	`linux-amd64-gpu-rtx2080-latest-1`
6	`linux-amd64-gpu-rtxa6000-latest-1`
5	`linux-amd64-gpu-h100-latest-1`
3	`linux-amd64-gpu-rtx4090-latest-1`

miscco · 2025-02-24T09:54:27Z

libcudacxx/include/cuda/__functional/for_each_canceled.h

 #include <cuda/std/__utility/unreachable.h>
 #include <cuda/std/cstdint>

+#include <cooperative_groups.h>


cooperative groups does not work with nvc++ currently so this needs to be guarded and we need to ensure that we might build without it

libcudacxx/include/cuda/__functional/for_each_canceled.h

jrhemstad · 2026-02-04T03:22:47Z

@gonzalobg are we still interested in carrying this forward?

gonzalobg · 2026-02-04T11:08:08Z

Yes, but i don't know when I can get to it.
Let me close this for now.

gonzalobg added 6 commits February 21, 2025 07:45

Tidy test

4b9ccc8

Extend test with prologue and epilogue

476e33f

Add cluster tests

761d088

Implement for_each_canceled_cluster

a50acc5

Update docs and move example to examples dir

4fb367e

typos docs

f7cdc27

gonzalobg requested review from a team as code owners February 22, 2025 13:14

gonzalobg requested review from ericniebler and gonidelis February 22, 2025 13:14

Merge branch 'main' into try_cancel_cluster

1afb02b

gonzalobg assigned bernhardmgruber, miscco and ahendriksen Feb 22, 2025

gonzalobg added 2 commits February 22, 2025 06:56

bugfix and more testing

c34582a

Improve codegen

76d8c7c

[pre-commit.ci] auto code formatting

a97c4fc

miscco requested changes Feb 24, 2025

View reviewed changes

jrhemstad added the needs info Cannot make progress without more information. label Feb 4, 2026

gonzalobg closed this Feb 4, 2026

github-project-automation bot moved this from In Progress to Done in CCCL Feb 4, 2026

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🟨 libcudacxx: Pass: 11%/43 | Total: 4h 58m | Avg: 6m 56s | Max: 25m 21s | Hits: 97%/5880

🟩 cub: Pass: 100%/45 | Total: 8h 19m | Avg: 11m 06s | Max: 30m 42s | Hits: 93%/53485

🟩 thrust: Pass: 100%/45 | Total: 6h 31m | Avg: 8m 42s | Max: 33m 31s | Hits: 96%/80136

🟩 cudax: Pass: 100%/22 | Total: 1h 57m | Avg: 5m 20s | Max: 14m 07s | Hits: 97%/11264

🟩 cccl_c_parallel: Pass: 100%/2 | Total: 15m 09s | Avg: 7m 34s | Max: 12m 46s | Hits: 98%/308

🟩 python: Pass: 100%/1 | Total: 40m 15s | Avg: 40m 15s | Max: 40m 15s

👃 Inspect Changes

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Modifications in project or dependencies?

🏃‍ Runner counts (total jobs: 158)

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gonzalobg commented Feb 22, 2025 •

edited

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