Top command to view system memory usage

First, use the top command

#View system memory and CPU usage
   top
#View the memory and CPU usage of a process
   top -p process ID

    For example: top -p 417

 

Second, the introduction of relevant parameters

#PID Process ID
#USER start process user
#PR Process priority
#VIRT The size of virtual memory occupied by the process, VIRT = SWAP + RES
#SWAP The size of the virtual memory used by the SWAP process that is swapped out to disk
#RES The size of the physical memory occupied by the process (relative to SWAP, the size that has not been swapped out)
#SHR The size of shared memory used by the process
#%CPU Process CPU usage
#%MEM Process physical memory usage