Processor scheduler performance

There are several performance-related issues to consider regarding the processor scheduler.

Thread support
A thread can be thought of as a low-overhead process. It is a dispatchable entity that requires fewer resources to create than a process. The fundamental dispatchable entity of the AIX Version 4 scheduler is the thread.
Processes and threads
A process is an activity within the system that is started by a command, a shell program, or another process.
Process and thread priority
The priority management tools manipulate process priority.
Scheduling policy for threads
The scheduling policy contains many possible values for threads.
Scheduler run queue
The scheduler maintains a run queue of all of the threads that are ready to be dispatched.
Scheduler processor time slice
The processor time slice is the amount of time a SCHED_RR thread can absorb before the scheduler switches to another thread at the same priority.
Mode switching
A user process undergoes a mode switch when it needs access to system resources. This is implemented through the system call interface or by interrupts such as page faults.

Parent topic: Resource management