jm + pmet   1

A Twitter thread about where P99s came from
"If you're wondering what "P-four-nines" means, it's the latency at the 99.99th percentile, meaning only one in 10,000 requests has a worse latency. Why do we measure latency in percentiles? A thread about how how it came to be at Amazon..."

This is a great thread from Andrew Certain, who managed the Performance Engineering team at Amazon in 2001. Percentiles, particularly for latency and performance measurement, were one of the big ideas which hit me like a ton of bricks when I joined Amazon, as they had been adopted whole-heartedly across the company by that stage.
p99  percentiles  quantiles  history  performance  analysis  measurement  metrics  amazon  aws  pmet 
24 days ago by jm

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