-XX:+ UseNUMA如何影响只有一个节点的系统的JVM性能? [英] How does -XX:+UseNUMA affects JVM performance for systems with only one node?

问题描述

关于JVM NUMA感知分配器的好处，有很多文章.但是，我找不到有关什么性能影响可能导致 -XX:+UseNUMA 标志用于单节点拓扑

There is a numerous articles regarding benefits of JVM NUMA-aware allocators. However I could not find information about what performance impact may cause -XX:+UseNUMA flag for single-node topologies like

# numactl --hardware
available: 1 nodes (0)
node 0 cpus: 0 1 2 3
node 0 size: 32060 MB
node 0 free: 7770 MB
node distances:
node   0 
  0:  10

这似乎是一种极端情况，启用标志并没有真正的好处.如果是这样，启用它是否会导致任何弊端?

It seems that this is a kind of corner case and there is no real profit in enabling flag. If so is there any drawbacks may be caused by enabling it?

推荐答案

-XX:+UseNUMA在这些情况下不会造成损害.
当在单个节点

-XX:+UseNUMA does no harm in these cases.
HotSpot JVM automatically turns off the flag when run on a single node (the source).

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