《07vps》.pdf

Module 7 Virtual Processors and Threads Objectives At the end of this module, you will be able to: w Define a thread w Describe the multithreaded architecture w Describe how the virtual processors are implemented in UNIX w Use onstat to monitor VPs and threads w List and explain the virtual processor classes w Describe how network connections are handled by the server w Set server configuration parameters related to VPs and threads w Dynamically add and remove virtual processors 7-2 What is a Thread? A thread is a sequence of instructions executed in a A thread is a sequence of instructions executed in a program. program. CPU oninit 7-3 Single Threaded Vs. Multithreaded Three processes, process process process single threads One process, multiple threads process 7-4 A Single-Threaded Process Process ContextContext Memory Program CounterProgram Counter Stack PointerStack Pointer Process Space Register ContentsRegister Contents text stack data 7-5 A Context Switch Context of Running