[ET-VK][ez] Fix 8 bit linear compute shader dispatch #9664
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Pull Request resolved: #9531 ## Context Currently, for the `q_8w_linear` shader, both the texture and the buffer variants use the same global work group and local work group setting. Specially, the global work group is set to `{out.numel(), 1, 1}` and the local work group is set to `{64, 1, 1}`. However, I believe this results in a very poor memory re-use for the texture shader. In this configuration: * Within a work group each invocation will be requesting a different row of A - 64 rows of A requested in total * All work groups will be requesting the same row of B * One work group will load 65 unique rows from A and B Compare this to a local work group size of `{8, 8, 1}` * Across the work group, 8 rows will be loaded from A and 8 rows will be loaded from B * One work group will load 16 unique rows total from A and B Evidently, there is better memory re-use in the latter work group as fewer unique rows are loaded. ## Changes Modify the `q_8w_linear` shader to use `{8, 8, 1}` local wg if possible. If `M` is small, then instead use `{4, 16, 1}` or `{2, 32, 1}` to reduce the number of inactive invocations. ghstack-source-id: 274260277 @exported-using-ghexport Differential Revision: [D71706489](https://our.internmc.facebook.com/intern/diff/D71706489/)
🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/9664
Note: Links to docs will display an error until the docs builds have been completed. ❌ 1 New Failure, 2 PendingAs of commit 58036f8 with merge base 7159650 ( This comment was automatically generated by Dr. CI and updates every 15 minutes. |
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Mar 26, 2025
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This PR was created by the merge bot to help merge the original PR into the main branch.
ghstack PR number: #9531 by @SS-JIA
^ Please use this as the source of truth for the PR details, comments, and reviews
ghstack PR base: https://github.com/pytorch/executorch/tree/gh/SS-JIA/200/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/SS-JIA/200/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/main
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/SS-JIA/200/orig
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