Linux top commands

Linux top commands

Enter the top command to enter

I. Upper Part

1. First line (task queue Information)

Current Time

Indicates the system running time.

Current Login User count

The current system load (load balancing), that is, the average length of the task queue. The three values are the average values from 1 minute, 5 minutes, and 15 minutes ago to the present.

The smaller the value, the easier the system. If the sum of the three numbers is divided by 3 and greater than 0.6, the system is very nervous.

 

2. Process and CPU information (when multiple CPUs exist, the content may exceed two rows)

Current process count

Number of processes currently running

Number of sleep Processes

Number of stopped Processes

Number of zombie Processes

Cpu (s): 0.4% us: CPU usage percentage of user space, 03% sy: CPU usage percentage of kernel space, 0.0% ni: CPU usage percentage of processes that have changed their priorities in user process space, 99.3% id: Percentage of idle CPU

3. Memory information of the 4th Five-Year Behavior

Total physical memory

Total physical memory used

Total idle memory

Memory Used as kernel Cache

Total swap area (similar to the concept of virtual memory in windows)

Total number of swap zones used

Total number of idle swap Areas

The total number of buffer swap areas. The content in the memory is swapped out to the swap zone and then into the memory, but the used swap zone has not been overwritten. This value is the size of the SWAp zone where the content already exists. When the corresponding memory is swapped out again, you do not have to write data to the swap zone.

Ii. Lower half

Column name	Description
PID	Process id
PPID	Parent process id
RUSER	Real user name
UID	User ID of the process owner
USER	User Name of the process owner
GROUP	Group Name of the process owner
TTY	The terminal name of the startup process. Processes not started from the terminal are displayed?
PR	Priority
NI	Nice value. A negative value indicates a high priority, and a positive value indicates a low priority.
P	The last CPU used is only meaningful in multiple CPU environments.
% CPU	CPU usage from the last update to the present
TIME	Total CPU time used by the process, in seconds
TIME +	Total CPU time used by the process, in 1/100 seconds
% MEM	Percentage of physical memory used by the Process
VIRT	Total virtual memory used by the process, in kb. VIRT = SWAP + RES
SWAP	In the virtual memory used by the process, the swap size, in kb.
RES	Physical memory used by the process, not swapped out, in kb. RES = CODE + DATA
CODE	Physical memory occupied by executable code, in kb
DATA	Physical memory occupied by parts other than executable code (Data Segment + stack), in kb
SHR	Size of shared memory, in kb
NFLT	Page error count
MCM t	The number of pages that have been modified since the last write to the present.
S	Process status. D = uninterrupted sleep R = run S = sleep T = tracking/stopping Z = zombie Process
COMMAND	Command name/command line
WCHAN	If the process is sleeping, the system function name displayed in sleep
Flags	Task flag, refer to sched. h

Appendix:

Linux top commands

Linux top commands for monitoring and diagnosis tools

Top command causes system load increase

Practical top Command

Why does Linux's htop command win the top command?

Use the most powerful process monitor htop in Ubuntu

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