Multiple independent models can be grouped together as submodels into a single run for problems such as bootstrapping or simulations where the top level model can fit an overall model on the estimation results returned from the independent models. In a case of independent models, OpenMx uses the facilities of snow and swift to distribute the job over multiple CPUs The limit to how many models can be structured into a hierarchy is the memory limit of your computer. We have run cases with tens of thousands of submodels.
