IBM I5/OS - Manual (Page 17)

i Series. my Series.
Processor Concepts
About Simultaneous Multi-Threading (SMT)
SMT is a technology that allows a single CPU to be seen logically as 2 logical CPU
Physical processor
Logical processors
SMT allows 2 threads to run simultaneously on the same processor
Using different execution units, or “pipes”
SMT optimizes the usage of the 7 execution units of a PowerPC processor
Hypervisor only deals with physical processors
Each operating system can use the physical processor as its needs
SMT can be used or not ... according partition’s operating system configuration
For i5/OS, refer to system value QPRCMLTTSK
33
i Series. my Series.
i Series. my Series.
Logical Partitions on the IBM Power5
Resources Management Concepts
Main Storage
34