[gpuCI] Forward-merge branch-22.04 to branch-22.06 [skip gpuci] #10546
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…seen in NDS q72 in Spark (#10534) The following change addresses a performance degradation we noticed in the `mixed_join` and `compute_mixed_join_output_size` that looks to be tied to the theoretical occupancy of these kernels, as limited by the number of registers used. The regression is triggered by this patch: #9727, which improves handling of unreachable code paths. That said, somehow, this change is altering the number of registers these kernels need. Both `mixed_join` and `compute_mixed_join_output_size` are very sensitive to the register count, per NSight compute. With the patch, the register required changed from 92 to 102, and 118 to 141 respectively. The fix here hints the compiler what our block size is (128 threads). This, from our testing, allows the compiler to reduce the number of registers required to 128 for `compute_mixed_join_output_size` and 96 for `mixed_join`. This lead to better occupancy (I think @nvdbaranec measured it going from 30% to 50%) and I saw the wall clock time of q72 (which started all this) to go from 133s to 121s, which is within the ballpark I'd expect. Authors: - Alessandro Bellina (https://github.com/abellina) Approvers: - Mike Wilson (https://github.com/hyperbolic2346)
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SUCCESS - forward-merge complete. |
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Forward-merge triggered by push to
branch-22.04that creates a PR to keepbranch-22.06up-to-date. If this PR is unable to be immediately merged due to conflicts, it will remain open for the team to manually merge.