Saving Another 100TB of RAM with Math (and Rust)
Cloudflare, Friday, September 18th, 2026
Cloudflare engineers cut another 100TB of fleet memory usage through algorithmic changes implemented in Rust.
Cloudflare describes a second round of memory optimization that reclaimed roughly 100 terabytes of RAM across its global fleet. The post details the data structure and algorithmic changes involved, including probabilistic techniques that trade a bounded error rate for large space savings.
It covers the Rust implementation work and how the team validated correctness and performance before rolling the change out at scale. The piece follows earlier work on the 1.1.1.1 DNS cache and shows how memory efficiency compounds across a large edge network.