Because we have encountered some perf regression due to using a one-shot kernel instead of NCCL on A100/H100, it will be beneficial if we can have a solid benchmarking of allreduce Op and analyze the data collected from it.
Implemented new AllreduceOp heuristic:
- Added Linear programming-based heuristic implementation.
- Added LUT-based heuristic implementation and corresponding code generation script.
AllreduceOp minor fixing:
- Fixed a minor issue in AllreduceOp, that the strategy can not be overridden when ONESHOT or TWOSHOT is set.
- Fixed a minor TWOSHOT kernel perf issue.
- Cleaned up Dispatching code in AllReduceOp.
This PR will fix the perf gaps reported in:
https://nvbugspro.nvidia.com/bug/5517023
For Deepseek-R1, it shows a performance gain of about 3-4% in concurrency levels of 256 and 512.
Signed-off-by: Yukun He <23156053+hyukn@users.noreply.github.com>
