Percentile Measurement for web requests within a purepath
We have multiple web requests made within a single purepath. I want to be able to measure the time for each web request and get percentile data.
I have created measures for the web request time for the endpoints of interest. When I chart these, the average and maximum values look accurate, but the percentile calculations do not. It appears that the percentile uses the total response time of purepath instead of the individual web request within in the purepath. Can you confirm this? Is there a way to get the percentiles that I'm looking for?
Michael,
Percentile data is calculated every hour, so the chart needs to be at least that much, preferably longer.
Here's what I suggest for debugging.
Create a new dashboard with a time period of (say) 6 hours and add the percentile chart for one of your web request measures to it. Export the dashlet into Excel (i.e., by right-clicking on the dashlet name and selecting Report ...). In Excel, you'll see numeric values for all the percentiles.
Add another chart dashlet with resolution of (say) 1 hour and add a line graph of the same measure repeated four times, with a different series aggregation, namely average, maximum, 95th percentile and 99th percentile. Show the table below the chart and add average, maximum and sum columns to the table. The values you see here should be roughly consistent with the values you see in the Excel spreadsheet, specifically for the 95th and 99th percentile.
You might post a screenshot of the chart together with the Excel spreadsheet, if the data still looks wonky.
-- Graeme
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