New Early Access builds
Alan.Bateman at oracle.com
Tue Dec 1 09:15:58 UTC 2020
The builds at the Project Loom Early Access page  have been
refreshed. The latest builds are based on jdk-16+25 (JDK 16 build 25).
There are important stability fixes in this build. We think this build
should resolve most of the crashes that people have reported over the
last few months when running with concurrent GCs. We are mostly testing
with G1 and ZGC. There may be a small performance impact in some cases
with the changes but for now, it will be great if you have been seeing
issues to re-test to see if there are any other issues.
One area that is currently not stable is the debugger support. We are
mid way through a big re-implementation. The "new approach" upgrades JVM
TI to fully support virtual threads so that the suspend/resume policies
needed when debugging can be supported. It also avoids the thread
identity issues that plagued the original approach. We hope to be at the
point soon where we can engage with the IDE/debugger maintainers about
adding support for virtual threads. We expect debuggers will need modest
changes, esp. in areas where a debugger wants to track all threads or
enumerate all threads or thread groups.
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