May 11, 2021

The optimal number of threads for any pool varies. I have found that on my 32 dual core (64) machines, 32 is more optimal than 64 for the validation threadpool. At some point the cost of fanning out the parallel jobs exceeds the benefit of parallelism. For this reason the node limits the number of threads configured to the number that are reported by the operating system, but that’s fairly arbitrary and more of a safeguard against gross misconfiguration.