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Remove unnecessary string cloning from the parser #9884

Merged
merged 5 commits into from
Feb 9, 2024
Merged

Remove unnecessary string cloning from the parser #9884

merged 5 commits into from
Feb 9, 2024

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charliermarsh
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Closes #9869.

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github-actions bot commented Feb 7, 2024 •
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ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

✅ ecosystem check detected no linter changes.

Formatter (stable)

✅ ecosystem check detected no format changes.

Formatter (preview)

✅ ecosystem check detected no format changes.

@charliermarsh charliermarsh force-pushed the charlie/string-parser branch 3 times, most recently from c9054e1 to efc7d6e Compare February 8, 2024 00:47
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Hate this change, didn't even improve benchmarks!!!

@MichaReiser
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MichaReiser commented Feb 8, 2024 •
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Hate this change, didn't even improve benchmarks!!!

That's because codspeed uses the fixed cost 0 for allocations....

@charliermarsh charliermarsh marked this pull request as ready for review February 8, 2024 18:07
charliermarsh
charliermarsh commented Feb 8, 2024
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crates/ruff_python_parser/src/string.rs Outdated
}
content.push(ch);
fn parse_bytes(mut self) -> Result<StringType, LexicalError> {
let index = first_non_ascii_byte(self.source.as_bytes());
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@BurntSushi - Is this exposed in any crates that we already use? I had to vendor it from bstr.

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Yes. :P https://docs.rs/bstr/latest/bstr/trait.ByteSlice.html#method.find_non_ascii_byte

dhruvmanila
dhruvmanila approved these changes Feb 8, 2024
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Nice!

crates/ruff_python_parser/src/string.rs Outdated
Comment on lines 219 to 220
// Add the characters before the escape sequence to the string.
let before_with_slash = self.skip_bytes(index + 1);
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nit: the index could also include { or } as well, right? The variable name before_with_slash suggests otherwise unless I'm wrong.

@dhruvmanila dhruvmanila added the parser Related to the parser label Feb 8, 2024
MichaReiser
MichaReiser approved these changes Feb 8, 2024
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🎸

@codspeed-hq CodSpeed HQ
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codspeed-hq bot commented Feb 8, 2024 •
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CodSpeed Performance Report

Merging #9884 will improve performances by 6.53%

Comparing charlie/string-parser (58178b3) with main (7ca515c)

Summary

⚡ 1 improvements
✅ 29 untouched benchmarks

Benchmarks breakdown

Benchmark main charlie/string-parser Change
⚡ linter/default-rules[pydantic/types.py] 8.6 ms 8 ms +6.53%

@charliermarsh
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I'm gonna get to the bottom of this if it's the last thing I do.

@charliermarsh charliermarsh marked this pull request as draft February 9, 2024 04:01
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I see basically no improvement on local benchmarks either via criterion or hyperfine. I'm not sure why, to be honest. I guess I'll proceed with the change since it's both (1) a better API, and (2) intuitively better to avoid re-allocating here when we don't need to. But I'm a bit confused.

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(Ignore current state of the PR, I duplicated the existing and updated code to do some benchmarking. I'll clean up later.)

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By removing lexing from the parser benchmark, I'm now able to see a more consistent 1-2% improvement in parse time, so I'll move forward with this. (Benchmarking the individual string-parsing functions (rather than the parser as a whole) shows an enormous speed-up, like 2x.)

@charliermarsh charliermarsh marked this pull request as ready for review February 9, 2024 20:46
@charliermarsh charliermarsh merged commit 6f0e4ad into main Feb 9, 2024
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@charliermarsh charliermarsh deleted the charlie/string-parser branch February 9, 2024 21:03
nkxxll pushed a commit to nkxxll/ruff that referenced this pull request Mar 10, 2024
@charliermarsh @nkxxll
Remove unnecessary string cloning from the parser (astral-sh#9884)
40b2772 
Closes astral-sh#9869.
@bswck bswck mentioned this pull request Mar 15, 2024
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@BurntSushi BurntSushi BurntSushi left review comments

@dhruvmanila dhruvmanila dhruvmanila approved these changes

@MichaReiser MichaReiser MichaReiser approved these changes

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Remove unnecessary string allocation from the parser
4 participants
@charliermarsh @MichaReiser @BurntSushi @dhruvmanila