A mechanism is provided for determining whether to use cache affinity as a criterion for software thread dispatching in a shared processor logical partitioning data processing system. Both the outer member and the inner member have a pin end and a box end. The flat base which extends along the longitudinal axis is provided with longitudinally spaced apart elongated slots, as an example, spaced every four inches, which extend lengthwise along the axis. A second air-cycle machine, assembled from commercial turbocharger components chosen individually to optimize their performance for cooling purposes, was tested to improve the overall cycle efficiency. The invention also provides a processing system for implementing the step of the methods as mentioned above.