SMF 99 - The Lost Gold of WLM Analytics

Project and Program: MVS, MVS Performance

Tags: Proceedings, SHARE Providence 2017, 2017

The SMF 99 records contain a wealth of information related to WLM algorithm decisions. They were
originally developed to trace WLM decisions, but over the years they have been expanded to provide
insights into HiperDispatch, Capping, Group Capacity Limits, machine topology, and more. Most
customers have the SMF 99 WLM decision records turned off due to their high volume. However, there
are many reasons to turn these records on during performance debugging and analysis.
During this presentation, Peter Enrico will provide an introduction to the SMF 99 records, as well as show
some very practical uses for these records and a number of performance insights these records will
provide.-Peter Enrico-Enterprise Performance Strategies Inc.

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