z/Architecture – Processing Workloads 2.5
Duration
5 hours
Overview
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.
Audience
Operations, Systems Programmers, and technical support personnel requiring in-depth knowledge about how tasks are processed within a z/OS environment.
Prerequisites
Completion of the z/OS – Concepts course, or equivalent knowledge.
Objectives
After completing this course, the student will be able to:
- 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
HiperDispatch
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
Subchannels
I/O Process
Access Methods
Parallel Access Volumes