Minecraft-Performance-Flags-Benchmarks
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NUMA shouldn't be enabled on Ryzen / Threadripper MCM CPUs
NUMA only applies when different parts of CPUs cannot access memory uniformly. Even for MCM Ryzen / Threadripper CPUs, their cores perfrom memory access unifromly through the only IO die. Also, the flag -XX:+UseNUMA
forces enabling NUMA. In general, this flag shouldn't be needed since with this flag absent JVM will automatically detect whether NUMA is needed.
It should be disabled automatically if not applicable.
My threadripper system has multiple NUMA domains with different access costs. Your BIOS may not be exposing this.