I’m sure most of you know how you can use Qshell to get a Unix -like interactive environment. You start an interactive Qshell session by using the Start QSH (STRQSH) or QSH command with *NONE for the CMD parameter.
(more…)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.
(more…)Back in October, IBM announced IBM i 7.1 TR9 and 7.2 TR1. Let’s take a closer look at these updates.
(more…)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.
(more…)A little over a year ago, IBM changed the handling of the inactive job time-out (QINACTITV) system value to improve accuracy and performance. That change is described in the blog article IBM Improves the Handling of the Inactivity Timeout.
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