Cassandra 5 JDK21 Command Line actions

[Vivekanand Koya]

Hello ZGC members,

I work on the Apache Cassandra team implementing support for JDK21 in the
upcoming Cassandra 5+ release. I need insight into JVM options providing
comparable and perhaps improved performance compared to G1GC. Some work has
been done using the previous defaults:
https://github.com/apache/cassandra/commit/b15d4d6980e787ab5f3405ca8cb17a9c92a4aa47.
Also, can you please provide the testing/benchmarking methodology used by
Stefan Johansson when presenting at Devoxx.

Hope to achieve greater outcomes together,
Thanks,
Vivekanand K.
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