Remove recommendation of the Aikars flags

[LemmaEOF]

The Aikars flags are old and outdated. Using them on Java 17 and 21 does users a massive disservice, as they are built around the archaic G1 garbage collector. Shenandoah on Java 17 and Generational ZGC on Java 21 are significantly more performant, with GenZGC providing sub-millisecond maximum GC pauses.

[YouHaveTrouble]

ZGC is hit or miss depending on the hardware setup. Aikar's flags are a popular standard, because they work good enough for over 90% of servers out of the box without the need of tweaking anything.

[LemmaEOF]

ZGC is hit-or-miss if it's not generational - GenZGC is excellent pretty much universally. On the other hand, some of the Aikars flags are massive footguns which are liable to make things way less stable.

[YouHaveTrouble]

Those are bold claims with no evidence provided. Benchmarks would need to be done on most hardware, old and new to even consider changing this.

[Pantera07]

Which is better depends on hardware.

[brianewell]

Any recommendations on a benchmarking suite to test for this?

[YouHaveTrouble]

Not really, as benchmarking minecraft itself is not realistically possible as it's not deterministic enough.
You would need similar workload. set amount of operations within x amount of time, just like server ticking.

You would also have to cover insane amount of hardware configurations. from desktop cpus to old xeons, because most people use crappy hosts that provide those old server cpus.

[brianewell]

So what evidence would the OP need to provide, as you've requested, to support their claim?

[YouHaveTrouble]

You would need similar workload. set amount of operations within x amount of time, just like server ticking.

You would also have to cover insane amount of hardware configurations. from desktop cpus to old xeons, because most people use crappy hosts that provide those old server cpus.

[ChrisTVH]

The Aikars flags are old and outdated. Using them on Java 17 and 21 does users a massive disservice, as they are built around the archaic G1 garbage collector. Shenandoah on Java 17 and Generational ZGC on Java 21 are significantly more performant, with GenZGC providing sub-millisecond maximum GC pauses.

I was curious to try this you propose: -XX:+UseZGC -XX:+ZGenerational
But in doing so I received the error of Failed to commit memory (Not enough space).

[LemmaEOF]

I was curious to try this you propose: -XX:+UseZGC -XX:+ZGenerational
But in doing so I received the error of Failed to commit memory (Not enough space).

I mean you still need -Xmx for maximum RAM allocation. Check noflags.sh for a command builder.

[ChrisTVH]

I was curious to try this you propose: -XX:+UseZGC -XX:+ZGenerational
But in doing so I received the error of Failed to commit memory (Not enough space).

I mean you still need -Xmx for maximum RAM allocation. Check noflags.sh for a command builder.

When I set it, it looks like this, since I can only assign flags, but the RAM flags are already defined.

[ChrisTVH]

I made it allocate a minimum amount of memory at startup, it will end up using all the RAM when the server loads anyway.
Now I will test if it is better than Arkflags with real players and using a configuration based on the recommendations in this guide.

[ChrisTVH]

I've tried it and I've never used something that works so horrible, it generates a lot of server lag.
https://spark.lucko.me/1tJhYAxeGu