Thanks for the feedback! We started the project with WeigHTTP, then starting with Round 2 we switched to Wrk [1] at the advice of other readers. Wrk provides latency measurements consisting of average, standard deviation, and maximum.
See the earlier conversation about standard deviation here: https://news.ycombinator.com/item?id=5455972
If we had distribution data available, we would aim to provide that in some form. And perhaps the author of Wrk could add that in time.
However, for the time being, I consider the matter somewhat academic. Not to be dismissive--I value your opinion--but I don't believe that would measurably impact my assessment of each framework's performance. Though, it would be fascinating to be able to validate my suspicion that Onion, being written in C, does not suffer even the tiny garbage collection pauses of the Java frameworks.