OpenVMS^®Languages and I/O Performance Report

Table of Contents

• Chapter 1 BUFFERED I/Os VERSUS DIRECT I/Os
  • 1.1 I/O Request Logic Flow
  • 1.2 QIO s
    • 1.2.1 Direct I/Os
    • 1.2.2 Buffered I/Os
• Chapter 2 LANGUAGE I/O BENCHMARKS
  • 2.1 Screen I/O s
    • 2.1.1 Building a Buffer
    • 2.1.2 Benchmark
  • 2.2 File I/O s
    • 2.2.1 Populating a Data File
    • 2.2.2 Benchmark
    • 2.2.3 I/Os Performed
    • 2.2.4 Reading Data Records
    • 2.2.5 Benchmark
    • 2.2.6 Updating Data Records
    • 2.2.7 Updating Data Record Example
    • 2.2.8 Benchmark
• Chapter 3 REDUCING FILE I/O BOTTLENECKS
  • 3.1 Reducing File I/O Activity
  • 3.2 Speeding Up I/O Operations
  • 3.3 Eliminating I/O Operations
  • 3.4 Host Based Data Caching
  • 3.5 RMS Buffering
    • 3.5.1 RMS Local Buffering
    • 3.5.2 RMS Global Buffering
    • 3.5.3 A RMS Global Buffering Example
    • 3.5.4 Monitoring RMS Cache Hits
    • 3.5.5 Statistics Option
    • 3.5.6 SYSGEN Parameter Changes
  • 3.6 Disk Defragmentation
  • 3.7 RMS File CONVERSION
  • 3.8 File Defragmentation
    • 3.8.1 Create a .FDL for the file
    • 3.8.2 Customize the .FDL file
    • 3.8.3 Converting and Renaming
• Appendix A System Resources
  • A.1 Resources Used By Global Buffering
    • A.1.1 Address Space
    • A.1.2 Physical Memory
• Index
• Tables
  • Table 2-1 Buffered I/O to the Screen Benchmark Summary
  • Table 2-2 Populating an Indexed File Benchmark
  • Table 2-3 Reading Data Structures Benchmark Summary
  • Table 2-4 Updating Data Records Benchmark Summary
  • Table 3-1 Methods of Eliminating File I/O
  • Table 3-2 RMS Global Buffering Minimum SYSGEN Parameter Values
  • Table 3-3 RMS Local Buffering Minimum SYSGEN Parameter Values