Check Linux memory usage

Source: Internet
Author: User
Tags cpu usage

  • 1. To view the process memory usage of the root user, you can use the following command:
    $ top-u Oracle
  • Content Explanation:
    PID: ID of the process
    USER: Process Owner
    PR: The priority level of the process, the smaller the higher the priority is executed
    Ninice: Value
    VIRT: Virtual memory consumed by the process
    RES: The physical memory occupied by the process
    SHR: Shared memory used by the process
    S: The state of the process. s for hibernation, R for running, Z for Zombie, n for the process priority value is negative
    %CPU: Process Consuming CPU utilization
    %MEM: The percentage of physical memory and total memory used by the process
    Time+: The total CPU time that is consumed after the process is started, which is the cumulative value of the CPU usage time.
    Command: Process start name

    注释:      输入top命令后,按键盘“P”,执行按%CPU使用率排行

    After entering the top command, press "T" on the keyboard to perform the mite+ ranking
    After entering the top command, press the keyboard "M" to perform the%mem ranking

      • 2, according to the process to see the memory of the process related information, (process number can be viewed through PS) as follows:
        $ pmap-d 14596

      • 3. See how much memory is actually used
        To view memory usage for all processes in the system, execute the following command:
        $ ps-e-O ' pid,comm,args,pcpu,rsz,vsz,stime,user,uid '

        查看系统指定进程Oracle的内存使用量,执行以下命令:

        $ ps-e-o ' pid,comm,args,pcpu,rsz,vsz,stime,user,uid ' | grep Oracle | Sort-nrk5

    Comments:
    Where Rsz is the actual memory, the above example is implemented by memory sort, from large to small

      • 4. See the N processes that currently occupy the most memory
        $ps-aux | Sort-k4nr | Head-n
        If it is 10 processes, n=10, if it is the highest three, n=3, for example $ps-aux | Sort-k4nr | Head-3
        Use the most CPU K processes
        $ps-aux | Sort-k3nr | Head-k

    Check Linux memory usage

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