102 IBM BladeCenter PS703 and PS704 Technical Overview and Introductionincrease system use without compromising the computing power for critical workloads in adedicated processor.Figure 3-5 shows how the dedicated shared processor mode can be configured.Figure 3-5 IVM console shows how to configure dedicated shared processorShared modeIn shared mode, logical partitions use virtual processors to access fractions of physicalprocessors. Shared partitions can define any number of virtual processors (maximum numberis 10 times the number of processing units assigned to the partition). From the POWERHypervisor perspective, virtual processors represent dispatching objects. The POWERHypervisor dispatches virtual processors to physical processors according to a partition’sprocessing units entitlement. One processing unit represents one physical processor’sprocessing capacity. At the end of the POWER Hypervisor’s dispatch cycle (10 ms), allpartitions receive total CPU time equal to their processing units entitlement. The logicalprocessors are defined on top of virtual processors. Therefore, even with a virtual processor,the concept of logical processors exists and the number of logical processors depends onwhether the simultaneous multithreading is turned on or off.3.4.3 Multiple Shared-Processor PoolsOne of the functions now available on POWER6- and POWER7-based blades managed byan SDMC is Multiple Shared-Processor Pools (MSPPs). This capability allows a systemadministrator to create a set of micro-partitions with the purpose of controlling the processorcapacity that can be consumed from the physical shared-processor pool.To implement MSPPs, there is a set of underlying techniques and technologies. An overviewof the architecture of Multiple Shared-Processor Pools can be seen in Figure 3-6.
