The RNI-Based LSPR and the Latest IBM Z Performance Brief
Project and Program:
MVS,
MVS Performance
Tags:
Proceedings ,
SHARE Columbus 2022
With the introduction of z196 in 2010, the Large System Performance Reference
(LSPR) was significantly enhanced to be based on a measure of a workload's
intensity of use of a processor's memory hierarchy. Since then the methodology
has seen much validation and continues to be used up through the latest IBM Z
processors. This session will discuss the theory behind the Relative Nest
Intensity (RNI) metric and its basis in data gathered using CPU MF. Its
application to capacity sizing will be illustrated by contrasting the
performance of the latest IBM Z processors. Topics include processors, cache and
memory topology, SMT, subcapacity models, and workload variability.
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