HP-UX 11i Tuning and Performance

1.3. Total System Resource Perspective

To understand performance management, it is necessary to understand the various system resources that interact to affect the overall performance of the system. Traditionally, system administrators viewed performance as the interaction of three system resources: central processing unit, memory, and I/O. Figure 1-1 shows this view. The Central Processing Unit, or CPU, is the hardware that executes the program codes, which exist as one or more processes. Each process may run as one or more threads, depending on the operating system (OS) version or variant. The part of the OS that controls the CPU resource is the process management subsystem, which handles the scheduling of the processes that want to use the ...