Speed up mbe matching in heavy recursive cases #7994
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Mar 13, 2021
7994: Speed up mbe matching in heavy recursive cases r=edwin0cheng a=edwin0cheng In some cases (e.g. #4186), mbe matching is very slow due to a lot of copy and allocation for bindings, this PR try to solve this problem by introduce a semi "link-list" approach for bindings building. I used this [test case](https://github.com/weiznich/minimal_example_for_rust_81262) (for `features(32-column-tables)`) to run following command to benchmark: ``` time rust-analyzer analysis-stats --load-output-dirs ./ ``` Before this PR : 2 mins After this PR: 3 seconds. However, for 64-column-tables cases, we still need 4 mins to complete. I will try to investigate in the following weeks. bors r+ Co-authored-by: Edwin Cheng <[email protected]>
This was referenced Mar 13, 2021
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Build failed: |
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I think 4 mins for 64-column-tables is okay because it is what it was before. |
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bors r+ |
IIUC, in this comment, rustc only used 26.75s in expanding. And right now we are using the same algorithm , so the performance should be similar. So there must be some bugs inside it :( |
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Agree, I was just talking about RA's performance I was observing before the regression. |
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In some cases (e.g. #4186), mbe matching is very slow due to a lot of copy and allocation for bindings, this PR try to solve this problem by introduce a semi "link-list" approach for bindings building.
I used this test case (for
features(32-column-tables)) to run following command to benchmark:Before this PR : 2 mins
After this PR: 3 seconds.
However, for 64-column-tables cases, we still need 4 mins to complete.
I will try to investigate in the following weeks.
bors r+