Application Programmer's I/O Guide

Table of Contents

New Features

About This Guide

Related Publications

Obtaining Publications

Conventions

Reader Comments

1. Introduction

The Message System

2. Standard Fortran I/O

Files

Fortran Unit Identifiers

Data Transfer Statements

Auxiliary I/O

Private I/O on CRAY T3E Systems

Multithreading and Standard Fortran I/O

3. Fortran I/O Extensions

BUFFER IN/BUFFER OUT Routines

Random Access I/O Routines (Not Available on IRIX systems)

Word-addressable I/O Routines (Not Available on IRIX systems)

Asynchronous Queued I/O (AQIO) Routines (Not Available on IRIX systems)

Logical Record I/O Routines (Not Available on IRIX systems)

4. Tape and Named Pipe Support

Tape Support (Not Available on IRIX systems)

Named Pipes

5. System and C I/O

System I/O

C I/O

6. The assign Environment

assign Basics

assign and Fortran I/O

The assign Environment File

Local assign

7. File Structures

Unblocked File Structure

Text File Structure

COS or Blocked File Structure

Tape/bmx File Structure (Not Available on IRIX systems)

8. Buffering

Buffering Overview

Types of Buffering

9. Devices

Tape

SSD

Disk Drives

Main Memory

10. Introduction to FFIO

Layered I/O

Using Layered I/O

Setting FFIO Library Parameters (UNICOS Systems Only)

11. Using FFIO

FFIO on IRIX systems

FFIO and Common Formats

Enhancing Performance

Sample Programs for UNICOS Systems

12. Foreign File Conversion

Conversion Overview

Transferring Data

Data Item Conversion

Foreign Conversion Techniques

Implicit Numeric Conversions (Cray PVP systems Only)

13. I/O Optimization

Overview

An Overview of Optimization Techniques

Determining I/O Activity

Optimizing System Requests

Optimizing File Structure Overhead

Minimizing Data Conversions

Minimizing Data Copying

Other Optimization Options

Optimization on UNICOS/mk Systems

14. FFIO Layer Reference

Characteristics of Layers

Individual Layers

15. Creating a user Layer

Internal Functions

user Layer Example

A. Older Data Conversion Routines

Old IBM Data Conversion Routines

Old CDC Data Conversion Routines

Old VAX/VMS Data Conversion Routine

Glossary