User Processes
A user process is a program that starts and executes in user space and is initiated by an ordinary user account. An ordinary user process does not have special admittance to the computer processor as well as to system files that do not belong to the user who began the process unless it is operated in a manner that grants the process specific permissions.
Daemon Process:
A program that is made to operate in the background, usually controlling some sort of ongoing service, is known as a daemon process. A daemon process may keep an eye out for incoming service access requests. The httpd daemon watches for requests to browse online pages.
Or a daemon could be designed to start operations on its own over time. For illustration, the crond daemon’s purpose is to start cron jobs at predetermined times.
Daemon processes are often executed as non-root users by such a user account that is devoted to the service, even though they are normally handled as services by a root user. A system is more protected from attacks when daemons are executed under distinct user accounts. Daemons are frequently launched by systems at boot time and kept active until the system is closed. Daemons can also be launched or stopped immediately, configured to run at specific system run levels, and, in some situations, notified to dynamically reload configuration data.
How to Find Top Running Processes by Memory and CPU Usage
Every current (running) instance of a program is referred to as a process in Linux. There are running processes on every instance of the Linux operating system. , SSHd, SSH processes, and cron jobs are a few examples. A process is started by any application that has to be used. These processes frequently produce new processes.
In Unix, each command you issue initiates or starts a new process. You initiated a process when you used the df command to display the amount of disc space available.
Processes in Linux
- UID – Associated user ID for this process.
- PID – ID of the process.
- PPID – ID of the parent process.
- %CPU – CPU utilized by the process.
- %MEM – Memory utilized by the process.
- STIME – Start time of the process.
- TIME – Time is taken by the process.
- COMMAND – The command that started this process.
In a Linux system, various types of processes exist. User processes, daemon processes, & kernel processes are some examples of these categories.