[External] : Re: jstack, profilers and other tools

[Alex Otenko]

To me that statement implies a few things:

- that Little's law talks of thread count

- that if thread count is low, can't have throughput advantage


Well, I don't feel like discussing my imperfect grasp of English.

On Tue, 19 Jul 2022, 23:52 Ron Pressler, <ron.pressler at oracle.com> wrote:

>
>
> On 19 Jul 2022, at 18:38, Alex Otenko <oleksandr.otenko at gmail.com> wrote:
>
> Agreed about the architectural advantages.
>
> The email that triggered my rant did contain the claim that using Virtual
> threads has the advantage of higher concurrency.
>
> > The throughput advantage to virtual threads comes from one aspect —
> their *number* — as explained by Little’s law.
>
>
>
>
> Yes, and that is correct. As I explained, a higher maximum number of
> threads does indeed mean it is possible to reach the higher concurrency
> needed for higher throughput, so virtual threads, by virtue of their
> number, do allow for higher throughput. That statement is completely
> accurate, and yet it means something very different from (the incorrect)
> “increasing the number of threads increases throughput”, which is how you
> misinterpreted the statement.
>
> This is similar to saying that AC allows people to live in areas with
> higher temperature, and that is a very different statement from saying that
> AC increases the temperature (althoughI guess it happens to also do that).
>
> — Ron
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mail.openjdk.org/pipermail/loom-dev/attachments/20220720/9fb7bea8/attachment-0001.htm>