> Production MySQL and Postgres master databases that I administer typically have uptime loads of 0.1 to 0.2 on Linux, processing 5,000 qps. I have worked with

> Production MySQL and Postgres master databases that I administer typically have uptime loads of 0.1 to 0.2 on Linux, processing 5,000 qps. I have worked with plenty production postgres instances that have much much higher loads. As in > 100 (on larger machines obviously). It's pretty easy to have workloads where the hot data set fits mostly into RAM - and if that's the case the read portion of that workload is usually bound by context switches and CPU processing time of the queries. Far from every workload has enough queries to utilize a machine with plenty cores, but there's also a lot where that's trivial.