1. A method for dynamic formation of symmetric multi-processor (SMP) domains in an optically-connected system having a plurality of SMP optically-connected switches in a computing environment, comprising: dynamically configuring together a plurality of SMP nodes via a plurality of SMP sockets that use the plurality of SMP optically-connected switches to dynamically connect a plurality of SMP optically-connected links connected to the plurality of SMP nodes to form one of a plurality of SMP domains based on best matched expected workloads for coherent traffic for exchanging SMP coherent information; and performing one of: dynamically adding one of the plurality of SMP nodes to the one of the plurality of SMP domains, and dynamically removing the one of the plurality of SMP nodes from the one of the plurality of SMP domains.