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Optimize formatting a bit #1558

merged 6 commits into from
Apr 6, 2024


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This takes the commits from #1163 that simplify and optimize our formatting code a bit. #1335 took the initial refactor from that PR, so now we can take the more interesting part.

Two commits make better use of match to only accept a formatting item if we also have the date/time/offset fields it needs, instead of using map inside a match arm.

The last commit introduces a couple of optimized number formatting functions. They are the trick that makes our formatting implementations for RFC 2822 and 3339 faster, so lets use them for regular formatting too 馃槃.


     Running benches/ (target/release/deps/chrono-413c84d256ba35f5)
bench_format            time:   [533.37 ns 535.14 ns 537.22 ns]
                        change: [-22.588% -21.943% -21.284%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 6 outliers among 100 measurements (6.00%)
  3 (3.00%) high mild
  3 (3.00%) high severe

bench_format_with_items time:   [388.35 ns 389.61 ns 391.09 ns]
                        change: [-29.520% -28.855% -28.271%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 1 outliers among 100 measurements (1.00%)
  1 (1.00%) high mild

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codecov bot commented Apr 6, 2024

Codecov Report

Attention: Patch coverage is 94.32624% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 91.80%. Comparing base (7f57dde) to head (e3feef3).

Files Patch % Lines
src/format/ 94.32% 8 Missing 鈿狅笍
Additional details and impacted files
@@            Coverage Diff             @@
##             main    #1558      +/-   ##
+ Coverage   91.78%   91.80%   +0.02%     
  Files          37       37              
  Lines       18167    18148      -19     
- Hits        16674    16661      -13     
+ Misses       1493     1487       -6     

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@djc djc left a comment

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Faster in less code, great work!

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Collaborator Author

Thank you 馃槃.

@pitdicker pitdicker merged commit 0cfc405 into chronotope:main Apr 6, 2024
35 checks passed
@pitdicker pitdicker deleted the formatting_optim branch April 6, 2024 12:44
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2 participants