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Performing large three-dimensional time-dependent simulations is a complex numerical task. Managing such simulations, often several at the same time as they execute on different supercomputers, is comparable to herding cats — supercomputers differ in their hardware configuration, available software ... [More] , directory structure, queueing systems, queuing policies, and many other relevant properties. However, these differences are only superficial, and the basic capabilities of supercomputers are very similar. The simulation factory contains a set of abstractions of the tasks which are necessary to set up and successfully finish numerical simulations using the Cactus framework. [Less]