Updated: 11 December 1998

OpenVMS Performance Management

Contents

Preface
Preface	Preface
Chapter 1
1	Performance Management
1.1	System Performance Management Guidelines
1.1.1	The Performance Management Process
1.1.2	Conducting a Performance Audit
1.2	Strategies and Procedures
1.3	System Manager's Role
1.3.1	Prerequisites
1.3.2	System Utilities and Tools
1.3.3	Why Use Them?
1.3.4	Knowing Your Work Load
1.4	Developing a Strategy
1.4.1	Managing the Work Load
1.4.2	Distributing the Work Load
1.4.3	Application Code Sharing
1.5	Analyzing Complaints
1.5.1	Preliminary Steps
1.5.2	Hardware Problem?
1.5.3	Blocked Process?
1.5.4	Unrealistic Expectations?
Chapter 2
2	Performance Options
2.1	Decompressing System Libraries
2.2	Disabling File System High-Water Marking
2.3	Setting RMS File-Extend Parameters
2.4	Installing Frequently Used Images
2.5	Enabling Virtual I/O Caching
2.6	Reducing System Disk I/O
2.7	Tuning
2.7.1	Prerequisites
2.7.2	Tuning Suggestions
2.7.3	Tools and Utilities
2.7.4	When to Use AUTOGEN
2.7.5	Adjusting System Parameter Values
2.7.6	Using AUTOGEN Feedback
2.7.7	Evaluating Tuning Success
2.7.7.1	When to Stop Tuning
2.7.7.2	Still Not Satisfied?
Chapter 3
3	Memory Management Concepts
3.1	Memory
3.1.1	Physical Memory
3.1.2	Virtual Memory
3.1.3	Process Execution Characteristics
3.2	Working Set Paging
3.3	Process Swapping
3.3.1	What is the Swapper?
3.3.2	Types of Swapping
3.4	Initial Working Set Quotas and Limits
3.4.1	Processes
3.4.2	Subprocesses and Detached Processes
3.4.3	Batch Queues
3.4.4	Required Memory Resources
3.4.5	User Programs
3.4.6	Guidelines
3.5	Automatic Working Set Adjustment (AWSA)
3.5.1	What are AWSA Parameters?
3.5.2	Working Set Regions
3.5.3	Adjustment Period
3.5.4	How does AWSA Work?
3.5.5	Page Fault Rates
3.5.6	Voluntary Decrementing
3.5.7	Adjusting AWSA Parameters
3.5.8	Caution
3.5.9	Performance Management Strategies for Tuning AWSA
3.6	Swapper Trimming
3.6.1	First-Level Trimming
3.6.2	Second-Level Trimming
3.6.3	Choosing Candidates for Second-Level Trimming
3.6.4	Disabling Second-Level Trimming
3.6.5	Swapper Trimming Versus Voluntary Decrementing
3.6.6	Virtual Balance Slots (VAX only)
3.7	Active Memory Reclamation from Idle Processes
3.7.1	Reclaiming Memory from Long-Waiting Processes
3.7.2	Reclaiming Memory from Periodically Waking Processes
3.7.3	Setting the FREEGOAL Parameter
3.7.4	Sizing Paging and Swapping Files
3.7.5	How is the Policy Enabled?
3.8	Memory Sharing
3.8.1	Global Pages
3.8.2	System Overhead
3.8.3	Controlling the Overhead
3.8.4	Installing Shared Images
3.8.5	Verifying Memory Sharing
3.9	OpenVMS Scheduling
3.9.1	Time Slicing
3.9.2	Process State
3.9.3	Process Priority
3.9.4	Priority Boosting
3.9.5	Scheduling Real-Time Processes
3.9.6	Tuning
3.9.7	Class Scheduler
3.9.8	Processor Affinity

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