Cloudflare Just Found 100TB of Hidden Memory by Cleaning Their Messy Closet
Engineering brilliance or just admitting they were being incredibly wasteful? Cloudflare spent a few months tightening the screws on their Big Pineapple DNS resolver, and the result is a massive pile of freed-up RAM that makes everyone look lazy.
The engineers at Cloudflare decided their DNS resolver, 1.1.1.1, was carrying way too much digital baggage. By applying five surgical code patches to their Rust-based Big Pineapple platform, they managed to shave 56% off the memory footprint per cache entry. They basically went on a hardcore data diet, swapping bulky dynamic vectors for lean fixed-size boxes and stop storing redundant domain names that were already hiding in the keys.
The team also got clever with how they handle enum data types. Since most DNS records are just simple A or AAAA types, they stopped letting the memory-hungry NAPTR records bloat everything else. They moved those heavy records out of the hot path, letting the system stop wasting space on empty padding bytes that were doing nothing but taking up room.
By the time they finished, the average memory per entry dropped from 953 bytes down to 420. The performance stats are actually kind of embarrassing for their old selves—the system is now 43% faster at adding records and 19% quicker at looking them up. They didn't just save space; they made the whole thing run smoother by keeping data closer to the CPU cache.
It is genuinely amusing to see a giant like Cloudflare brag about cleaning up their own bloated code to find the equivalent of 130 entire servers worth of RAM. Instead of actually turning those servers off and saving on electricity, they are just going to hoard more data in an even bigger cache. It really highlights how modern software is built on a foundation of infinite waste just waiting for someone to finally care enough to optimize it.
Source: Cloudflare
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