在top命令下kill和renice进程

For common process management tasks, top is so great because it gives an overview of the most active processes currently running (hence the name top). This enables you to easily find processes that might need attention. From top, you can also perform common process management tasks, such as adjusting the current process priority and killing processes.

[root@rhel7 ~]# top

top - :: up  min,   user,  load average: 0.00, 0.01, 0.05
Tasks:   total,    running,   sleeping,    stopped,    zombie
%Cpu(s):  0.0 us,  0.0 sy,  0.0 ni,100.0 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem :   total,   free,     used,    buff/cache
KiB Swap:   total,   free,         used.   avail Mem 

  PID USER      PR  NI    VIRT    RES    SHR S %CPU %MEM     TIME+ COMMAND
     root                   S  0.0  0.4   :01.61 systemd
     root                             S  0.0  0.0   :00.00 kthreadd
     root                             S  0.0  0.0   :00.01 ksoftirqd/
     root      rt                       S  0.0  0.0   :00.00 migration/
     root                             S  0.0  0.0   :00.00 rcu_bh
     root                             S  0.0  0.0   :00.00 rcuob/
    root                             S  0.0  0.0   :00.66 rcu_sched
    root                             R  0.0  0.0   :00.30 rcuos/
    root      rt                       S  0.0  0.0   :00.02 watchdog/
    root        -                    S  0.0  0.0   :00.00 khelper
    root                             S  0.0  0.0   :00.00 kdevtmpfs
    root        -                    S  0.0  0.0   :00.00 netns
    root        -                    S  0.0  0.0   :00.00 perf
    root        -                    S  0.0  0.0   :00.00 writeback
    root        -                    S  0.0  0.0   :00.00 kintegrityd
    root        -                    S  0.0  0.0   :00.00 bioset
    root        -                    S  0.0  0.0   :00.00 kblockd
    root        -                    S  0.0  0.0   :00.00 md
    root                             S  0.0  0.0   :01.04 kworker/:
    root                             S  0.0  0.0   :00.00 khungtaskd
    root                             S  0.0  0.0   :00.00 kswapd0
    root                             S  0.0  0.0   :00.00 ksmd
    root                            S  0.0  0.0   :00.01 khugepaged
    root                             S  0.0  0.0   :00.00 fsnotify_mark
    root        -                    S  0.0  0.0   :00.00 crypto
    root        -                    S  0.0  0.0   :00.00 kthrotld
    root        -                    S  0.0  0.0   :00.00 kmpath_rdacd
    root        -                    S  0.0  0.0   :00.00 kpsmoused
    root        -                    S  0.0  0.0   :00.00 ipv6_addrconf
    root        -                    S  0.0  0.0   :00.00 deferwq
    root                             S  0.0  0.0   :00.00 kauditd
   root        -                    S  0.0  0.0   :00.00 ata_sff

Now that you know how to use the  kill  and  nice  commands from the command line, using the same functionality from top is even easier. From top, type  k . top will then prompt for the PID of the process you want to send a signal to. By default, the most active process is selected. After you enter the PID, top asks which signal you want to send. By default, signal 15 for SIGTERM is used. However, if you want to insist a bit more, you can type  9  for SIGKILL. Now press  Enter  to terminate the process.

To renice a running process from top, type  r . You are first prompted for the PID of the process you want to renice. After entering the PID, you are prompted for the nice value you want to use. Enter a positive value to increase process priority or a negative value to decrease process priority.