Linux Real-Time Process Monitor (Top) Explained

“Top” displays system summary information and a list of all processes and threads currently being managed by the Linux kernel. ... It is also an interactive program, meaning that the output can be customized and manipulated while it's running.

1. What does TOP mean in Linux?
2. Which command is used for real-time process monitoring?
3. What is KiB MEM in top command?
4. How do I monitor a process in Linux?
5. How does Linux Top work?
6. What is PS EF command in Linux?
7. How do you monitor process performance?
8. How do I start a process in Linux?
9. How do I check CPU and memory utilization on Linux?
10. What is virt in top command?
11. What is batch mode in Linux?
12. How do you read top command output?

What does TOP mean in Linux?

top command is used to show the Linux processes. It provides a dynamic real-time view of the running system. Usually, this command shows the summary information of the system and the list of processes or threads which are currently managed by the Linux Kernel.

Which command is used for real-time process monitoring?

In Linux, Top command is utilized to monitor Linux Process which is used frequently used by many systems. It is available under many Linux, Unix like operating system. All the running and active real-time processes in ordered list is displayed and updates it regularly by this Top command.

What is KiB MEM in top command?

RES -- Resident Memory Size (KiB) : The non-swapped physical memory a task has used. SHR -- Shared Memory Size (KiB) : The amount of shared memory available to a task, not all of which is typically resident. It simply reflects memory that could be potentially shared with other processes.

How do I monitor a process in Linux?

1. Top – Linux Process Monitoring. ...
2. VmStat – Virtual Memory Statistics. ...
3. Lsof – List Open Files. ...
4. Tcpdump – Network Packet Analyzer. ...
5. Netstat – Network Statistics. ...
6. Htop – Linux Process Monitoring. ...
7. Iotop – Monitor Linux Disk I/O. ...
8. Iostat – Input/Output Statistics.

How does Linux Top work?

top command displays processor activity of your Linux box and also displays tasks managed by kernel in real-time. It'll show processor and memory are being used and other information like running processes. This may help you to take correct action. top command found in UNIX-like operating systems.

What is PS EF command in Linux?

This command is used to find the PID (Process ID, Unique number of the process) of the process. Each process will have the unique number which is called as PID of the process.

How do you monitor process performance?

1 Answer

1. Open Performance Monitor (control panel -> administrative tools)
2. Add Counters.
3. Expand "Process"
4. Select "Private Bytes"
5. Select the processes to monitor in the "Instances of selected object" the hit Add, or just hit Add for the entire system.
6. Ok.

How do I start a process in Linux?

The easiest way to start a process is to type its name at the command line and press Enter. If you want to start an Nginx web server, type nginx. Perhaps you just want to check the version.

How do I check CPU and memory utilization on Linux?

How to find out CPU utilization in Linux?

1. The "sar" command. To display CPU utilization using "sar", use following command: $ sar -u 2 5t. ...
2. The "iostat" command. The iostat command reports Central Processing Unit (CPU) statistics and input/output statistics for devices and partitions. ...
3. GUI Tools.

What is virt in top command?

n: %MEM -- Memory usage (RES) A task's currently used share of available physical memory. o: VIRT -- Virtual Image (kb) The total amount of virtual memory used by the task. It includes all code, data and shared libraries plus pages that have been swapped out and pages that have been mapped but not used.

What is batch mode in Linux?

Batch mode refers to batch processing, which means automated processing, without human intervention. Batch is the opposite of interactive. In batch mode, top produces output that's more sensible for collecting to a log file or for parsing (though top isn't really good at producing parseable output even in batch mode).

How do you read top command output?

What is Top Command and How to Read Top Command?

1. ​Top command is one of the basic command to monitor server processes in Linux. ...
2. Let's see every single row of the output to explain all the information found within the screen. ...
3. Second Row : task.
4. Third Row : cpu. ...
5. Fourth and Fifth Row : Memory usage.
6. This rows will provide you the information about the RAM usage.