fix: Missing thread sync in CUDA connected components #4080
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WalkthroughHmmm. Introduced a synchronization barrier in the Changes
Sequence Diagram(s)sequenceDiagram
participant T as Thread
participant K as Kernel (labelConnectedComponents)
participant A as Array Initialization
participant S as Sync Barrier (__syncthreads)
participant M as Main Loop
Note over K: Kernel execution begins
T->>A: Initialize shared arrays
T->>S: Execute __syncthreads()
S-->>T: Synchronization complete
T->>M: Enter main loop computations
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Actionable comments posted: 0
🧹 Nitpick comments (2)
Plugins/ExaTrkX/include/Acts/Plugins/ExaTrkX/detail/ConnectedComponents.cuh (2)
33-34: Document the reasoning behind single block constraint, we must.Clear to future maintainers, the limitation of single block execution should be. Add a comment explaining why this constraint exists and its impact on scalability, we should.
- // Currently this kernel works only with 1 block + // This kernel is restricted to single block execution to ensure + // correct synchronization of the connected components algorithm. + // Note: This may limit scalability for large graphs.
25-27: Document performance characteristics, we should.Help future developers understand the performance implications of synchronization barriers, we must. Add performance notes to the algorithm documentation, I suggest.
/// Implementation of the FastSV algorithm as shown in /// https://arxiv.org/abs/1910.05971 +/// Note: This implementation uses multiple thread synchronization barriers +/// which may impact performance. The single-block constraint also limits +/// scalability to the maximum number of threads per block.
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Plugins/ExaTrkX/include/Acts/Plugins/ExaTrkX/detail/ConnectedComponents.cuh(1 hunks)
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🔇 Additional comments (2)
Plugins/ExaTrkX/include/Acts/Plugins/ExaTrkX/detail/ConnectedComponents.cuh (2)
36-41: Wise addition of thread synchronization barrier, this is!Prevent race conditions between initialization and main loop processing, this synchronization does. Ensures all threads complete their initialization before proceeding, it does. A critical fix for thread safety, this is.
44-97: Well-synchronized, the FastSV algorithm implementation is!Proper thread synchronization at critical points, it maintains. Follows the FastSV paper's algorithm faithfully, it does. No concerns with the implementation, have I.
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