What is HiperDispatch and how does it impact performance?
HiperDispatch is the z/OS exploitation of PR/SM’s new Vertical CPU Management (VCM) capabilities and is exclusive to the z10 EC. Rather than dispatch tasks randomly across all logical processors in a partition, z/OS will tie tasks to small queues of logical processors, and dispatch work to a “high priority” subset of the logicals. PR/SM provides processor topology information and updates to z/OS, and ties the high priority logical processors to physical processors. HiperDispatch can lead to improved efficiencies in both the hardware and software in the following two manners: 1) work may be dispatched across fewer logical processors therefore reducing the “multi-processor (MP) effects” and lowering the interference among multiple partitions; 2) specific z/OS tasks may be dispatched to a small subset of logical processors which PR/SM will tie to the same physical processors thus improving the hardware cache re-use and locality of reference characteristics such as reducing the rate of cro
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