numa node的数量等于物理cpu的个数么？

答案是未必：

numa node 的个数不一定等于物理cpu的个数。

需要具体看cpu的厂商与型号，比如下图，socket只有2个，但是numa node一共有8个.

上图出自：

https://www.servethehome.com/wp-content/uploads/2017/06/AMD-EPYC-7601-2P-64-Core-8x-NUMA-Nodes-Ubuntu.jpg

在帖子(https://superuser.com/questions/916516/is-the-amount-of-numa-nodes-always-equal-to-sockets)中，也有人说numa node的数量未必物理cpu的个数：.

The number of NUMA nodes does not always equal the number of sockets. 
For example, an AMD Threadripper 1950X has 1 socket and 2 NUMA nodes 
while a dual Intel Xeon E5310 system can show 2 sockets and 1 NUMA node.