Cloudflare Reduces DNS Cache Memory Usage by 100 Terabytes Across Global Network
Cloudflare has detailed five Rust-level memory layout optimizations applied to the DNS cache of its 1.1.1.1 public DNS resolver service, internally known as Big Pineapple. By redesigning how cache entries are stored in memory, engineers managed to cut per-entry memory consumption by 56 percent. This optimization successfully freed approximately 100 terabytes of RAM across Cloudflare's entire global server fleet.
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| Aspect | Before / Alternative | After / This |
|---|---|---|
| Per-entry memory footprint | Higher memory consumption due to unoptimized Rust layout | Reduced by 56% through field reordering and optimized types |
| Global fleet memory usage | 100 TB more RAM consumed by DNS cache entries | 100 TB of RAM reclaimed for other system processes |
| Cache layout design | Standard structures with padding overhead | Compact Rust-level memory alignments and optimized pointers |
Source: Cloudflare Blog
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