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Course Catalog » z/OS Curriculum » z/Architecture 2.4 Series

z/Architecture - Processing Workloads 2.4

5 hours



The z/OS Architecture - Processing Workloads course describes how today's z/OS system processes workloads, focusing on the concepts of address spaces showing how they provide the environment under which tasks can run. You will look at the different types of CPUs that can be configured in a z/OS system and see how programs issue instructions to the CPU. Diving down deeper you will then look at the CPU chips themselves and view the components that comprise them, looking at their involvement in processing work. Finally, the major components that comprise the mainframe's I/O structure are presented to show how work moves throughout the z/OS environment.


Operations, Systems Programmers, and technical support personnel requiring in-depth knowledge about how tasks are processed within a z/OS environment.


Completion of Interskill's z/OS - Concepts and Components course, or equivalent knowledge.


After completing this course, the student will be able to describe how:

  • Address spaces are used as containers for units of work
  • The CPU processes instructions
  • CPU sharing is used and managed
  • The Channel Subsystem facilitates I/O

Course Content

Address Spaces and Tasks

Address Space Structure and Purpose

Accessing and Sharing Memory

Address Space Control Blocks

System and Subsystem Address Spaces

Starting and Stopping Address Spaces

Dispatchable Units of Work

Task Activity Within an Address Space

Task Control Blocks

Service Request Blocks

Processors and CPUs

Program Instructions

Loading a Program into Memory

Types of Registers

Program Status Word

Prefixed Save Area

Single Chip Modules

CPU Types

Instruction and Data Caching

Simultaneous Threading

Sharing the CPU

CPU Sharing Concepts

Obtaining and Releasing CPU Resources

Selecting CPU Work

Processing work on zIIPs


Interrupt Processing

Interrupt Handlers

I/O and the Channel Subsystem

Traditional I/O Processing

z/OS Channel Subsystem

Logical Channel Subsystems

Control Units and Devices

I/O Definitions


I/O Process

Access Methods

Parallel Access Volumes

z/Architecture - Processing Workloads 2.4 Mastery Test

Course Catalog » z/OS Curriculum » z/Architecture 2.4 Series
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