Author: Zen and the Art of Computer Programming
1 Introduction
Process management is a very important function in the Linux operating system. It involves the allocation, scheduling and management of system resources, and is the key to the normal operation of the system. This article will lead you to learn the three most important process management tools under Linux-ps, top, and kill. These tools make it easy to manage, monitor, and maintain processes in the system.
2. Background introduction
Process (Process) is the basic unit for resource allocation and scheduling by the operating system, and each process has a unique process ID (PID). In an operating system, multiple processes can run concurrently. Each process has its own memory space, data structure, code segment, stack, file descriptor and other resources. Therefore, if the system has too many processes or memory leaks, it is necessary to further optimize the process management tool to improve the system performance. stability and operating efficiency.
In the Linux system, there are several commonly used process management tools:
- ps: used to view the process status information currently running in the system
- top: Displays the overall performance indicators of the processes currently running on the system
- kill: used to terminate the specified process or signal
Among them, ps and top are commands for viewing processes, and kill is a command for terminating processes.
3. Explanation of basic concepts and terms
(1) What is a process?
Process (Process) is the basic unit for resource allocation and scheduling by the operating system, and each process has a unique process ID (PID). In an operating system, multiple processes can run concurrently. Each process has its own memory space, data structure, code segment, stack, file descriptor and other resources, so if the system has too many processes or memory leaks, you need to further