alex-breslow-amd dc3a0c5242 Disable the __threadfence on the sender side of the simple protocol when possible. (#1830) ...

Leverages the traits of extended-scope fine-grain memory to get rid of a device-scope acquire-release fence.  This improves throughput for single node workloads on gfx942 and gfx950 for some input sizes (e.g., ~32 MiB to about 256 MiB) when using the simple protocol.  Multinode workloads on MI300X see a smaller but statistically significant uplift for some message sizes.  Runtime disablement is supported via setting the environment variable RCCL_GFX942_CHEAP_FENCE_ON to 0.

[ROCm/rccl commit: 1aa2570b48]

2025-08-15 07:54:54 -07:00

projects/rccl

Disable the __threadfence on the sender side of the simple protocol when possible. (#1830)

2025-08-15 07:54:54 -07:00

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