This book provides information on concepts, tools, and techniques for assessing and tuning the performance of systems. Topics covered include efficient system and application design and implementation, as well as post-implementation tuning of CPU use, memory use, disk I/O, and communications I/O. Most of the tuning recommendations were developed or validated on AIX Version 4.
This book is intended for application programmers, customer engineers, experienced end users, enterprise system administrators, experienced system administrators, system engineers, and system programmers concerned with performance tuning of operating systems. You should be familiar with the operating system environment. Introductory sections are included to assist those who are less experienced and to acquaint experienced users with performance-tuning terminology.
The following highlighting conventions are used in this book:
| Bold | Identifies commands, subroutines, keywords, files, structures, directories, and other items whose names are predefined by the system. Also identifies graphical objects such as buttons, labels, and icons that the user selects. |
| Italics | Identifies parameters whose actual names or values are to be supplied by the user. |
| Monospace | Identifies examples of specific data values, examples of text similar to what you might see displayed, examples of portions of program code similar to what you might write as a programmer, messages from the system, or information you should actually type. |
Everything in the AIX operating system is case-sensitive, which means that it distinguishes between uppercase and lowercase letters. For example, you can use the ls command to list files. If you type LS, the system responds that the command is "not found." Likewise, FILEA, FiLea, and filea are three distinct file names, even if they reside in the same directory. To avoid causing undesirable actions to be performed, always ensure that you use the correct case.
ISO 9000 registered quality systems were used in the development and manufacturing of this product.
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