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IBM z Systems® : Performance Report on Exploiting SMT for SAP Application Servers on z13®

Document Author:
Additional Author(s):

Veng Ly
Brenda Beane, Seewah Chan, Paul Lekkas

Document ID:


Doc. Organization:

IBM Systems

Document Revised:


Product(s) covered:

DS8870; IBM Z; Linux; Linux on zSeries; LPAR; OSA; z13; zEnterprise EC12; zSeries; z/OS; z/VM

Abstract: With the recent availability of the z13 machine, the new processor chip offers intelligently implemented 2-way simultaneous multithreading. Simultaneous multithreading (SMT) allows two active instruction streams per core, each dynamically sharing the core's execution resources. The SMT feature is available in IBM z13 for workloads running on the Integrated Facility for Linux (IFL) and the z Integrated Information Processor (zIIP).

SAP on z Systems is an excellent candidate in employing zIIP processors for the SAP database server, and IFL processors for SAP application servers. Therefore, it can exploit SMT and potentially see performance gains from using it.

The IBM SAP on z Systems Performance Team, located in Poughkeepsie, NY, conducted a number of experiments to evaluate the performance effects of enabling SMT on IFLs for SAP application servers, running on Linux as z/VM guests. At the time of our study, the SMT feature was not available for Linux running as native LPARs.

We used the SAP Banking Services (SBS) Day Posting workload, which is a good representation of a customer online transaction processing (OLTP) workload. On the application server side, this workload is CPU intensive with minimal file I/O activity. See section 3.0 Workload Description for details of this workload.

We started with baseline measurements on a zEC12 system. Then we ran on a new z13 system for core to core comparison and SMT benefit evaluation.



Hardware; Software; Solutions




Enterprise Application Solutions (EAS/ERP); ISV Applications




Cross-Platform; IBM Z

S/W Pillar(s):

Information Management; IBM System z Software


Linux; z/VM; z/OS


z13, DB2 11 for z/OS, SAP, SAP Banking, Performance, SMT, SMT2

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