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Note, only relevant for OpenJDK and the JVMs based on it, there are other GC available to other JVMs, including real time ones.

graalvm and graalvm's svm/native-image as well, the latter having only SerialGC, with G1 in EE only, and crashing ;(

Genuinely interested - could you share some good resources about it?

For example, in what concerns real time GCs, these are good books,

"Hard Realtime Garbage Collection in Modern Object Oriented Programming Languages."


The author is one of the founders of Aicas real time JVM, https://www.aicas.com/wp/products-services/jamaicavm/

"Distributed, Embedded and Real-time Java Systems"


PTC is the other company alongside Aicas, that still sells real time Java systems, https://www.ptc.com/en/products/developer-tools/perc

IBM J9 has the evolution of the Metronome GC, https://www.researchgate.net/publication/220829995_The_Metro...

And it has extensions for value types, via packed object data, https://www.ibm.com/docs/en/sdk-java-technology/7.1?topic=ob...

Someone else already referred Azul, they also have extensions for value types, called object layouts, https://www.slideshare.net/AzulSystems/jvm-language-summit-o...

Then there are special flavours like microEJ or the Android Java snowflake.

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