Big Pineapple, the platform behind 1.1.1.1, Gateway DNS, DNS Firewall, AS112, and several other Cloudflare DNS services, stores over 250 billion DNS cache entries at any given time. At that scale, wasting a single byte per entry costs more than 250 gigabytes of memory across our fleet.

Five successive changes to how cache entries are stored in memory cut the per-entry footprint by over 50%. Across our fleet, these changes freed up roughly 100 terabytes of memory, equivalent to the amount of RAM in 130 of our Gen 13 servers. The cache also got faster. Insert throughput rose 43% and lookup latency dropped 19%, as fewer allocations and better memory locality meant we did not trade speed for space.

More than any technical detail, the learnings I most want you to take away are to trust your instincts and to question assumptions. Just because a piece of code (or anything, not just code!) has been a certain way for a long time doesn’t mean that it’s optimal or even correct.

"Мы всячески пытаемся отучить, особенно молодежь, находиться в интернете с постоянно включенным VPN, потому что это небезопасно", - подчеркнул Боярский. По его словам, "злоупотреблять этими сервисами точно не стоит", поскольку это может завести пользователей "в те уголки интернета", от опасности которых "всеми своими ресурсами государство пытается их оградить".

"Вот в этом наша сейчас основная задача", - отметил глава комитета, подчеркнув, что сам не использует VPN-сервисы.

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If your disk isn’t critically struggling with available space, are you even #Rusting?

I’m the main author of iddqd, a Rust library for maps (named after the Doom cheat code) where keys are borrowed from values. <...>

iddqd consists of a fair amount of unsafe code underneath. There’s been some recent concern over the amount of unsafe code in Rust rewrites, so I thought I’d write about some of the unsafe code in iddqd and how we try to tame it.