<>1.top command

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

<>2.free command

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 .

<>3.cat /proc/meminfo

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