z/OS SMT: Understanding the Measurements and Applicability
Project and Program: MVS
, MVS Performance
, SHARE Providence 2017
Should you enable Simultaneous Multithreading (SMT) on your z13 or z13s for your zIIP workloads? That is an interesting question that doesn’t have an easy answer. If you do enable SMT you should be prepared to review a number of SMT-specific measurements as well as your standard application measurements. Unfortunately, these are some of the most confusing, misunderstood, and poorly documented measurements in all of the SMF data.
Join Scott Chapman in this session as he explores the meaning and derivations of the SMT measurements for zIIPs and then presents existing measurements that may be useful in determining if SMT should even be explored. A decision tree for deciding whether to stay in single-threaded mode or try SMT-2 will be introduced.-Scott Chapman-Enterprise Performance Strategies Inc.
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