How we saved 100 terabytes of memory by optimizing 1.1.1.1’s DNS cache
Why it matters — For systems operating at massive scale, minor per-entry memory overhead translates to massive fleet-wide waste. These optimizations not only reclaimed 100 TB of RAM but also improved cache insert throughput by 43% and reduced lookup latency by 19%. The approach demonstrates that immutable data structures can leverage more compact memory representations without sacrificing performance.
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