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ZGC, included in JDK 11, has a 1ms average pause time and 4ms max on some demanding benchmarks, and they're now targeting 1ms max pauses.

https://www.opsian.com/blog/javas-new-zgc-is-very-exciting/

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Wow great link. I live pretty deep in Javaland and had no idea it was that good!

If it lives up to claims surely it’s a paid for add on?

Originally it was intended as a commercial feature, but since JDK 11 Oracle open sourced all previously-commercial features in the JDK, and now it's part of OpenJDK. It's already available in JDK 11 and 12.

I never got to the level where I needed anything more than the stock default GC. But this looks compelling. Does Kotlin and other JVM based languages benefit from it, too?

Sure. All languages that run on the Java platform[1] can benefit from it, and from most other Java platform enhancements.

[1]: I prefer saying Java platform rather than JVM, because a program written in Kotlin shares over 90% of its infrastructure code with a program written in Java (not including the OS), and the JVM constitutes only about 20% of that.

It works really great with heaps >100GB and is included in the openjdk since 11. Note, that only linux is supported, I think

As my world is currently only serverside this isn’t a limitation but a feature ;)

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