How to add P75 and P85 along with the P90 measurements ?

[vinayaga-raman]

Feature/improvement

Been trying out siteSpeed and I must say Im amazed at the product flexibility and ease of use. It makes life so much easy for the web developers. Thanks in advance.

Question is how to add P75 and P85 along with the P90 measurements ? Is this a code change or just a configuration change ?

[soulgalore]

I think it's configurable in browerstime and then you need to change some configurations to send it to your datasource. How many runs do you do in our testing os 75/85 will make a difference?

[vinayaga-raman]

To answer your question, there is a perceptible difference between Mean and P90 even with 5 tests on a URL as the web application randomly takes time. We want to see P80 even within the hour rather than mean, Im not sure where to start in Browsertime. Will start fiddling around in the configuration.

Actually, what we need to do eventually is take 24 measurements in a day (one run a hour), but show a graph with one measurement for the whole 2 hours using the P80 percentile of all measurements taken in 24 hours. No idea how to proceed for this ask, guess I need to fiddle in Grafana to understand this better !

[soulgalore]

The p80 in sitespeed.io is the 80 percentile of the run/iteration you use. Then the next time you run your test, it will be the p80 of those runs, not combined. If you want the p80 over time, over multiple test runs you need to collect it yourself and then calculate it. For example:
sitespeed.io -n 11 ... will report p80 of those 11 runs. If you need p80 of a metric over time, you need to store it between runs so you can calculate it.

perceptible difference between Mean and P90

Yeah, that's why median and p80 is also included :D Mean is not good if you have fluctuation in your metrics.