top Commands are used to dynamically monitor information such as process activity and system load , Its format is top.
PID： Of the currently running process ID
USER： Process owner
PR： Priority of each process
NInice： React to a process “ priority ” Value of state , Its value range is -20 to 19, One
common 40 Levels . The smaller the value , Represents a process ” priority ” The higher , And the more
large “ priority ” The lower . Generally nice Value is called static priority
VIRT： Virtual memory occupied by process
RES： Physical memory occupied by the process
SHR： Shared memory used by the process
S： Status of the process .S Indicates sleep ,R Indicates running ,Z Indicates a dead state ,N express
The process priority is negative
%CPU： Process occupation CPU Usage rate of
%MEM： Percentage of physical and total memory used by the process
TIME+： The total CPU time , I.e. occupation CPU Cumulative value of service time .
COMMAND： Process start command name
total : Total physical memory size .
used : How large has been used .
free : How many are available .
Shared : Total memory shared by multiple processes .
Buffers/cached : Size of disk cache .
-/+ buffers/cached) :
free: How many are available .
Swap For temporary memory , When the real memory of the system is not enough , You can temporarily use disk space as memory .