1. A computer program product for facilitating execution of work units in a computing environment, said computer program product comprising: a computer readable storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising: analyzing, by an analyzer executing on a processor, one or more resource requirements of a work unit to be executed; determining, based on the analyzing, whether the work unit is to be executed on the processor or an offload processing system different from the processor, the offload processing system and processor being heterogeneous of one another; obtaining, responsive to the determining indicating the work unit is to be executed on the offload processing system, an indication of one or more offload processing systems satisfying one or more criteria for execution of the work unit; checking whether at least one offload processing system of the indication of one or more offload processing systems has sufficient resources to execute the work unit; selecting, responsive to the checking specifying at least one offload processing system that has sufficient resources, a selected offload processing system to execute the work unit; and assigning the work unit to be executed on the selected offload processing system for execution, wherein the selected offload processing system has at least one of a different operating system, a different architecture or a different external attachment from the processor.