Opensource, Community, Governance
christian.wimmer at oracle.com
Wed May 1 17:30:18 UTC 2019
Some answers to your Native Image related technical points:
> - JNI over the C-ish "porting" of the JDK (removes DCE opportunities)
We see this as the only feasible way to have a maintainable and stable
Native Image code base that works across multiple platforms (Linux,
MacOS, Windows) and JDK versions (8, 11, latest).
We also think that it is not going to impact the startup time and memory
footprint of native images, but implementation is not complete enough
yet to show this.
> - The fallback mode of native-image for Helidon
The fallback mode is not implemented for technical reasons, but only for
legal reasons. Especially, it has nothing to do with Helidon (or any
other concrete application that supports Native Image).
> - The tight intertwinglyness of compressed pointers and isolates
This is a technical necessity: compressed pointers can only be used when
references within the image heap are relative to the heap base - which
is exactly what isolates provide. The support for isolates is a
(positive) side effect of compressed pointers.
> - The lazy class initiatialization changes
Based on our experience and feedback from early adopters (and all the
effort you did for Quarkus was an important feedback for us too), it
became clear that the default needs to be "initialize classes at run
time". This is what Java developers are used to, and no application will
work out-of-the-box if you change this. A lot of libraries and
frameworks of course want to take advantage of class initialization at
build time. We envision that libraries will ship with the appropriate
configuration, i.e., that Quarkus will ship with the configuration that
most classes are initialized at build time.
I'm sorry that we rushed out these changes, but we felt that the time
window for a change like that was closing rapidly.
> - the LLVM effort
I don't understand your concern here. What can be negative about
supporting more platforms via LLVM?
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