Rewriting a Ruby C Extension in Rust
summary
Rewriting a Ruby C extension in Rust demonstrates that a straightforward Rust implementation of Sam Saffron’s fast_blank outperforms the hand‑written C extension and that a one‑liner style Rust port can be faster than the C gem. It shows the Skylight agent prototype moving heavy instrumentation into Rust, measures a surprising real‑world hotspot (~4% of request time) improved, and explains why no heap allocations, static dispatch and inlining, and zero‑cost abstractions produce C‑level assembly while keeping high‑level code.
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chapters (10)
- 0:00Start
- 12:22Naive Rust Implementation
- 13:44Abstractions
- 16:31How Does a Method Work in Rust
- 21:36Allocation
- 23:47Heap Allocation
- 24:26Stack Allocation
- 38:52Zero Cost Abstractions
- 39:43The Closure Syntax in Rust
- 40:58Difference between Rust and Ruby
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