EA builds with changes to object monitor implementation to avoid pinning with virtual threads

[Alan Bateman]

On 10/02/2024 12:24, Andrii Lomakin wrote:
>
> Hi Alan.
> That is cool!
>
> Does this build support file async io aka io_uring features?
>

The purpose of these EA builds to have builds available with the changes 
to the object monitor implementation so we might get some feedback and 
help testing the changes.

On file I/O, I'm not sure if you are asking about 
AsynchronousFileChannel implemented on io_uring or if you are asking 
about virtual threads doing file I/O using io_uring. There is a branch 
in the sandbox with prototype infrastructure but it will be some time 
before all the pieces can come together and properly evaluate for both 
of these cases. Right now, in these EA builds, doing file I/O in virtual 
thread when the file is opened with the options for synchronized I/O 
file/data integrity will increase the target parallelism for the 
duration of write operations. The latency of writes for these cases is 
significant. For direct I/O it is both read + write operations as these 
bypass the file caches.

-Alan