What is P99 latency?

web-services networking web-applications p99
maverik picture maverik · Oct 9, 2012 · Viewed 70.7k times · Source

What does P99 latency represent? I keep hearing about this in discussions about an applications performance but couldn't find a resource online that would talk about this.

Answer

Tomasz Nurkiewicz picture Tomasz Nurkiewicz · Oct 9, 2012

It's 99th percentile. It means that 99% of the requests should be faster than given latency. In other words only 1% of the requests are allowed to be slower.

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