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Latency is the new downtime
In the early days of Google, a lot of users were asking for 30 results on the first page of search results. So after long deliberation, Marissa Mayer, then the Product Manager for google.com, decided to run the A/B test for ten vs 30 results. When the results came in, they were in for a surprise.
Latency Percentiles are Incorrect P99 of the Times
What are P90, P95, and P99 latency? Why are they incorrect P99 of the times? Latency is for a unit of time and the preferred aggregate is percentile.