[lrem]

Do you mean that a single CPU can saturate the throughput of a machine's RAM? That's a bit surprising, given that current crop of Intel CPUs does non uniform memory access. Or, is that bandwidth so much above any I/O that it doesn't matter?

[doyoubi]

Nop. It's that a better solution would still be using multiple Redis instances on each physical server. Trying to support multi-threads in the storage engine requires complex synchronization implementation. Sharing nothing between each small instance achieves higher performance and is a lot simpler. Also, FULL SYNC between masters and replicas can be uncontrollable. And smaller memory size for each instance alleviates the performance impact from FULL SYNC.

[ohthehugemanate]

not to mention, multiple instances follows the indistry direction in horizontal scalability. Common advice when building for k8s style cloud environments is to target single core, n instances, to maximize scaling flexibility and atomicity.