A Technical Deep Dive into Extreme Performance Optimization

P99 0 ms* Autocomplete for 240M Domain Names

Based on Hacker News Discussion

99 Points | Featured Story

240M+

Domain names requiring autocomplete

Source: ruurtjan.com

03

The Challenge

Delivering instant search across hundreds of millions of records

01

Massive Dataset Size 240+ million domain names must be searchable in real-time
02

Sub-millisecond Response Users expect instant feedback as they type
03

P99 Latency Target Even the slowest 1% of queries must respond in ~0ms
04

Memory Constraints Efficient data structures required for in-memory operations

05

Innovative engineering approaches to achieve near-zero latency

1

Compact representation of domain names to fit in memory

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2

Trie-based indexing for fast prefix matching

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3

Cache-friendly, contiguous memory organization

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4

Minimize pointer chasing and memory access

0.1ms

P50 Latency

0.2ms

P90 Latency

0.5ms

P99 Latency

4.2ms

Memory Usage

* P99 ~0ms means virtually instant response even at the tail

Proving that extreme performance is achievable with the right approach

Source: ruurtjan.com/articles/p99-0ms-autocomplete-for-240-million-domain-names