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Comment by Traubenfuchs | Hacker News Reader

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Traubenfuchs·

Is there a benchmark somewhere?

What kind of Java software profits most from this?

Why not inegrate into mainline OpenJDK?

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This is not MS specific feature should be available in all JDK 17.0.8. Title is a little confusing, MS doesn't maintain a separate code base. They provide builds of the common JDK.

They got into a lot of trouble by making their own Java once. They won't try it again.

This particular patch was upstreamed to OpenJDK tip and will be part of Java 22 for all vendors. We have back-ported the patch to our builds of 11, 17 (and shortly 21), and offer those back-ports upstream. However, those back-ports won't always be accepted into the stable LTS branches, so sometimes they'll only sit in our builds for those versions (like this patch in our 17.0.8+ builds). We make that clear in our release notes etc and the code is always available on our GitHub under the GPLv2+CE license.

This is interesting. Does this mean builds from Amazon, MS, Redhat may have different features?

Yes, they do. Many people don't get the point across that Java is like C and C++, there are plenty of implementations.

Regarding OpenJDK, here are some examples,

Amazon has Lambda SnapStart into their implementation, Azul uses a LLVM based JIT, their own pauseless GC and extensions for value types (ObjectLayout), Red-Hat ships Shenodah.

It is upstreamed into OpenJDK.

"upstreamed"? Is this feature developed by Microsoft?

Perhaps upstream wasn't the correct word. The feature was implemented in OpenJDK by a Microsoft employee.

[0] https://github.com/openjdk/jdk/pull/9073 [1] https://github.com/openjdk/jdk/pull/12897

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