Why NUMA matters?

This is a very short blog post because more and more VMware customers and partners are asking me the same question ... 

"Why NUMA matters?"

If you want to know more I would highly recommend reading Frank Denneman's detailed blog posts or books about NUMA, however, the table below is worth 1000 words.

Source: https://frankdenneman.nl/2016/07/07/numa-deep-dive-part-1-uma-numa/

Local memory access latency is ~ 75 ns.

Remote memory access latency is ~ 132 ns.

A ~ 40% positive impact on performance is worth to incorporate NUMA considerations in your data center infrastructure design.

If you prefer a comprehensive presentation, Frank Denneman should speak on VMworld 2020 about NUMA in session "60 Minutes of NUMA [HCP2453]".