1. Tangible machine readable media storing thereon instructions for a method comprising: reading data comprising a code module, the code module comprising instructions for use in configuring a machine; and preparing the module of instructions to be ready for instantiation for execution on a target computation system, the target computer system comprising a plurality of computation units, collectively capable of multithreaded execution of instances of code modules, wherein the preparing comprises providing configuration information comprising an indication of operating group size, and configuring a packet unit to be operable to form groups of computation instances to be concurrently dispatched for execution on the target computer system, each computation instance being associated with a respective code module, and controlling the dispatch using respective target dispatch quantities of grouped instances of code modules, according to a function using the operating data group size of at least one of the respective code modules associated with computation instances of each grouping.