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Performance Comparison of SQLite parse_number() Implementations in C and Rust

Performance Comparison of SQLite parse_number() Implementations in C and Rust

First seen 9 Nov 2026, 07:41 UTC • •
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ThreatCluster AI
ThreatCluster •November 9, 2026 at 07:42 UTC
  • •C implementation of parse_number() is 2x faster than Rust versions.
  • •C version is significantly smaller in size compared to Rust.
  • •All implementations passed extensive fuzz testing for reliability.

A research report published on November 9, 2026, details a performance comparison between SQLite's parse_number() function implementations in C and Rust. The study, generated by an LLM, shows that the optimized C version outperforms Rust, achieving speeds of 16-19 ns per row compared to Rust's 41-46 ns. The C implementation is also significantly smaller, at 14 KB versus Rust's 284-306 KB. The report notes that while C was faster on integers, it lagged behind Rust for decimal parsing until a fast path was introduced, which resolved the issue. All versions of the function passed 8 million fuzz checks, ensuring consistent behavior across implementations. The findings highlight the trade-offs between speed and safety in programming languages, particularly in database function implementations.

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Updated 8h ago How this analysis works

Timeline

2026-10-26
Webframe evaluation completed
An evaluation of webframe as a scraper and sandbox was conducted, revealing performance issues and limitations.
github.com
2026-11-08
Research report published
A comparative analysis of SQLite parse_number() implementations in C and Rust was published, showcasing performance metrics.
github.com

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Common questions

What are the performance differences between C and Rust implementations?
The C implementation runs at 16-19 ns per row, while Rust versions take 41-46 ns, with C being faster on integers but slower on decimals until optimized.
How reliable are the implementations?
All versions of the parse_number() function passed 8 million fuzz checks, indicating consistent and reliable behavior.
What are the size differences between the implementations?
The C implementation is 14 KB, while the Rust versions range from 284-306 KB due to the inclusion of the standard library.