Cloudflare saves 100TB RAM with Rust DNS optimizations
DanielLockyer · x · 2026-08-28
Cloudflare shared results on optimizing their DNS cache using Rust. At 250 billion cache entries, a single wasted byte costs 250GB of RAM. Through five Rust optimizations, they freed 100TB of RAM, increased insertion speed by 43%, and improved lookup speed by 19%, without trading performance for space.
Related event: Cloudflare Cuts 100TB of Memory with Rust DNS Cache Optimizations(3 posts)→
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