Project Loom presentation at BangaloreJUG

[Volkan Yazıcı]

[To the best of my knowledge,] pinning a carrier thread means that the
fiber will block the thread. In the current prototype, holding a
monitor is still a blocking operation.

On Mon, Dec 16, 2019 at 9:21 AM Nawazish Khan
<md.nawazish.khan at gmail.com> wrote:
>
> Thanks Alan, I am curious and want to understand what you mean by pinning
> of carrier thread. Seems like an important concept because we even have a
> JVM switch for it.
>
> Sincerely,
> MNK
>
> On Mon, Dec 16, 2019, 2:05 AM Alan Bateman <Alan.Bateman at oracle.com> wrote:
>
> > On 14/12/2019 11:34, Nawazish Khan wrote:
> > > Hi All,
> > >
> > > I would be speaking on Project Loom at BangaloreJUG which would be hosted
> > > at Oracle office on 21st December, 2019.
> > >
> > > Let me know if I could help by taking any survey or any other information
> > > which might be helpful to all of us as an input to the project Loom.
> > >
> > We don't have any prepared surveys but there are several areas where it
> > would be useful to collect data.
> >
> > In the current prototype, if a virtual thread parks (network I/O or
> > locking operation) while holding a monitor then it pins the carrier
> > thread. This is a quality-of-service rather than a correctness issue but
> > it would be useful to get reaction to needing to change some (not all)
> > code to use java.util.concurrent locks to workaround this limitation for
> > the short term. If there are developers trying out the current repo in
> > the meet-up then get them to run with -Djdk.tracePinnedThreads=full and
> > see if the monitors usages would be easy or hard to change.
> >
> > Thread locals. It would be useful to get data on whether developers are
> > using TLs directly or not. We've looked at a lot of TL usages in
> > libraries and frameworks but not applications as they aren't easy to get
> > at. One of the topics being explored in this project is scope locals and
> > it would be useful to get an idea how many of the TL usages could be
> > replaced with scope locals.
> >
> > -Alan.
> >
> >
> >
> >