nmon 是一个资源监控工具，能够监控 Linux 系统资源（ cpu，memory，network，disks ）的使用情况，常见用法如下：

[root@localhost ~]$ yum install -y nmon

[root@localhost ~]$ nmon    +nmon-16g------[H for help]---Hostname=localhost----Refresh= 2secs ---17:14.17--------------------------------------------------------------------------------------------------------------+|                                                                                                                                                                                           ||   ------------------------------                                                                                                                                                          ||    _ __  _ __ ___   ___  _ __          For help type H or ...                                                                                                                             ||   | '_ \| '_ ` _ \ / _ \| '_ \          nmon -?  - hint                                                                                                                                   ||   | | | | | | | | | (_) | | | |         nmon -h  - full details                                                                                                                           ||   |_| |_|_| |_| |_|\___/|_| |_|                                                                                                                                                           ||                                        To stop nmon type q to Quit                                                                                                                        ||   ------------------------------                                                                                                                                                          ||                                                                                                                                                                                           ||   CentOS release 6.5 (Final) CentOS release 6.5 (Final)                                                                                                                                   ||   Vendor=GenuineIntel Model=Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz                                                                                                                       ||   MHz=3201.000 bogomips=6402.00          lscpu:CPU=4 Little Endian                                                                                                                        ||   ProcessorChips=1 PhyscalCores=2              Sockets=2 Cores=2 Thrds=1                                                                                                                  ||                    VirtualCPUs =4              MHz=3201 max=0 min=0                                                                                                                       ||                                                                                                                                                                                           ||   Use these keys to toggle statistics on/off:                                                                                                                                             ||     c = CPU         l = CPU Long-term     - = Faster screen updates                                                                                                                       ||     C = " WideView  U = Utilisation       + = Slower screen updates                                                                                                                       ||     m = Memory      V = Virtual memory    j = File Systems                                                                                                                                ||     d = Disks       n = Network           . = only busy disks/procs                                                                                                                       ||     r = Resource    N = NFS               h = more options                                                                                                                                ||     k = Kernel      t = Top-processes     q = Quit                                                                                                                                        | +-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+