perf: Avoid re-canonicalizing the entire IntervalSet on push #1308
+37
−9
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Canonicalize is taking up a significant amount due to a regex with a huge amount of character ranges (generated by [lalrpop](https://github.com/lalrpop/lalrpop)'s lexer expanding multiple `\w` in a token). While this could perhaps be fixed in lalrpop I did notice the TODO in the code and after addressing this so we automatically union and compress on each push instead of re-canonicalizing on every push and that fixed the performance problem. I did see the earlier attempt at this rust-lang#1051 and it seems like that was reverted and regression tests were added so I hope that and the existing tests are enough (I don't have a clear idea on what tests might be missing).
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Canonicalize is taking up a significant amount due to a regex with a huge amount of character ranges (generated by lalrpop's lexer expanding multiple
\win a token). While this could perhaps be fixed in lalrpop I did notice the TODO in the code and after addressing this so we automatically union and compress on each push instead of re-canonicalizing on every push and that fixed the performance problem.I did see the earlier attempt at this #1051 and it seems like that was reverted and regression tests were added so I hope that and the existing tests are enough (I don't have a clear idea on what tests might be missing).