The Read-Heavy Assumption
"It's read-heavy, so we'll add a cache" is the least examined sentence in system design. Four things that break it, and how to check it in an afternoon.
6 min read
Posts tagged Performance
3 posts, newest first.
Your p99 Is Lying to You: Percentiles Don't Compose
Ten services at p99 don't make a p99 page load: why per-service percentiles mislead, why averaging them is meaningless, and what the client sees that you don't.
5 min read
Five Load Balancing Algorithms, and When Each One Betrays You
Round-robin, least-connections, IP hash, weighted and random: what each does to your tail latency, and when the popular default is the wrong choice.
5 min read
