IBM i Selfie

In the IBM i Performance Analysis Workshop, we reinforce the concept that many forces outside of system software or applications can influence the performance of your partition. These are typically configuration type details—anything from how you have the QPFRADJ (Performance Adjuster) system value set, to the amount of memory on your partition, to how you have your processors configured.

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Enhanced SMT Controls for POWER7

Simultaneous Multi-Threading (SMT) allows sharing of processor facilities to run two or more threads of execution at the same time on a single processing core. On POWER7, each processing core supports up to 4 threads of execution. SMT generally increases the performance capacity of a system and can improve the responsiveness of multithreaded applications. Running multiple instruction streams at the same time does not, however, improve the performance of any given task. POWER8 and POWER9 support up to 8 threads per processor core.

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