On Thu, Nov 17, 2022 at 12:47 PM J. D. Jordan <jeremiah.jor...@gmail.com> wrote:
> -1 on providing a bunch of choices and forcing users to pick one. We > should have a default and it should be “good enough” for most people. The > people who want to dig in and try other gc settings can still do it, and we > could provide them some profiles to start from, but there needs to be a > default. We need to be asking new operators less questions on install, not > more. > > Re:experience with Shenandoah under high load, I have in the past seen the > exact same thing for both Shenandoah and ZGC. Both of them have issues at > high loads while performing great at moderate loads. I have not seen G1 > ever have such issues. So I would not be fine with a switch to Shenandoah > or ZGC as the default without extensive testing on current JVM versions > that have hopefully improved the behavior under load > I have personally reverted hundreds of machines off of G1 with 12G heaps on jdk8, where (intelligently tuned) CMS with the same workload/heap size was fine. It was many years ago, and G1 has changed a lot, but the "zero problems with G1" is AT LEAST 1 problem with G1, by someone who knew how both Cassandra and the JVM works.
