GitHub moved the Copilot runtime to Rust 🚀

GitHub migrated the runtime behind Copilot to Rust, and used Copilot during the migration itself.

✅ Why this is worth reading:

• Runtime work is systems work: a language migration means tracing real production behavior, not just translating syntax.

• Copilot was part of the workflow: useful for exploring an unfamiliar codebase, drafting changes, and keeping momentum through repetitive conversion work.

• The output still needs engineering judgment: boundaries, performance, correctness, and rollout safety are not autocomplete problems.


This is a practical case study for teams asking where coding agents help on a large refactor. Use them to accelerate investigation and implementation. Keep humans on architecture, tests, and production checks.


[ Blog ] :
https://github.blog/ai-and-ml/generative-ai/migrating-the-github-copilot-runtime-to-rust-using-copilot

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#AI #GitHub #Rust #Copilot
@ProgrammingTip

Cloudflare saved 100 TB of RAM with math and Rust 🔥

Cloudflare reclaimed more than 100 TB of RAM globally in a Pingora-based consistent-hashing service. No new hardware. The win came from changing data representation and the algorithms around it.


✅ Lessons:

• Measure retained memory, not only allocation rate.
• Check collection shape: duplicated keys, oversized buckets, and pointer-heavy graphs add up fast.
• Fix the model first: a smaller or more compact structure usually beats micro-optimizing a hot loop.

For high-cardinality caches, routing tables, or tenant maps, take a heap dump before reaching for another cache node. A few bytes per entry becomes expensive at fleet scale.

[ Blog ] :
https://blog.cloudflare.com/saving-100-tb-of-ram-with-math

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#Performance #Memory #Rust
@ProgrammingTip