how we will calculate time difference between 90%and 95% (Aggregate Report)

Question

we have run 3000 samples total duration time is 4 min 45 sec how is it possible 99% of requests are taking time only 1 min 20 sec and only 1 % of requests take the rest of the time

we have run 3000 samples total duration time is 4 min 45 sec how is it possible 99% of requests are taking time only 1 min 20 sec and only 1 % of requests take the rest of the time

Answer 1

As per JMeter Glossary:

90% Line (90th Percentile) is the value below which 90% of the samples fall. The remaining samples too at least as long as the value. This is a standard statistical measure. See, for example: Percentile entry at Wikipedia.

As per Request Stats Report

90% line (ms) 90th Percentile. 90% of the samples were smaller than or equal to this time.

95% line (ms) 95th Percentile. 95% of the samples were smaller than or equal to this time.

99% line (ms) 99th Percentile. 99% of the samples were smaller than or equal to this time.

So if you see i.e. 1500 ms as 90% percentile it means that 90% of Samplers response time was 1500 ms or less, the remaining ones are higher.