Author here. After my last post about kernel bugs, I spent some time looking at how the JVM reports its own thread activity. It turns out that "What is the CPU time of this thread?" is/was a much more expensive question than it should be.

I don't think it is possible to talk about fractions of nanoseconds without having an extremely good idea of the stability and accuracy of your clock. At best I think you could claim there is some kind of reduction but it is super hard to make such claims in the absolute without doing a massive amount of prep work to ensure that the measured times themselves are indeed accurate. You could be off by a large fraction and never know the difference. So unless there is a hidden atomic clock involved somewhere in these measurements I think they should be qualified somehow.

Did you look into the large spread on your distributions? Some of these span multiple orders of magnitude which is interesting

Very thankful for the 1liner tldr

edit : I had an afterthought about this because it ended up being a low quality comment ;

Bringing up such TLDR give a lot of value to reading content, especially on HN, as it provides way more inertia and let focus on -

reading this short form felt like that cool friend who gave you a heads up.