z Systems Simultaneous Multithreading Revolution

An IBM Redbooks Point-of-View publication

Published 14 January 2015, updated 14 January 2015

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IBM Form #: REDP-5144-00
(5 pages)

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Authors: Daniel Rosa, Donald Schmidt, Romney White


Typical simultaneous multithreading (SMT) implementations allow workloads from different control programs to use a compute core concurrently, but with variable core capacity gains and thread execution slowdowns. The new IBM z13 platform implements SMT differently. At any point in time, a single control program manages the entire core, giving each workload more repeatable core capacity for processing.

The z13 has new instrumentation that helps control programs deliver real-time measurements of the SMT-based allocations of core resources. And the z/OS and z/VM control programs use SMT on the z13 to optimize their workloads while providing repeatable metrics for capacity planning and chargeback.

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