5x Slower Context Switching Between Fiber-vs-Thread

[Alan Bateman]

On 05/02/2019 08:41, Volkan Yazıcı wrote:
>
> I have created a GiST: 
> https://gist.github.com/vy/c5031a54d42f9e5b855463c838fed6a9
> You can just run the file as follows: *java SlowFiberReport.java*
>
Thanks. For this test then I assume it is spending almost all of the 
time freezing and thawing, something that is work in progress and a bit 
early to benchmark at this time. In addition, from your numbers, I 
suspect this test may be yielding with interpreter frames on the 
continuation stack for most/all of the run. You may have heard Ron speak 
about lazy copy which involves thawing only a portion of the stack. It's 
not enabled by default yet but you can try it with 
-XX:+UnlockDiagnosticVMOptions -XX:+UseNewCode (not 
-XX:+UnlockExperimentalVMOptions as we have on the wiki).

-Alan