nmon: Nigel’s Monitor



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nmon (short for Nigel’s Monitor) is a popular system monitor tool for the AIX and Linux operating systems. The original nmon was a freely downloadable tool for AIX 4.3 from the AIX wiki. It was also rewritten for the Linux operating system running on IA-32, x86-64, RS/6000 and Power processor and Mainframe and released by IBM to open source in July 2009. Its features were then bundled as part of the AIX operating systems from AIX 5.3 TL09 and AIX 6.1 TL02 within the topas command. It is used by AIX and Linux Systems Administrators and performance tuning specialists around the world. [wikipedia]

1. To start, execute command nmon. From NMON initial screen, you can select any type of statistics to monitor, CPU, Memory, Disks and etc. This command is really helpful and cool!

┌nmon─12f─────────────────────Hostname=aracici─────Refresh= 2secs ───15:43.23─
│                                                                               
│  ------------------------------       For help type H or ...                 
│  #    #  #    #   ####   #    #        nmon -?  - hint
│  ##   #  ##  ##  #    #  ##   #        nmon -h  - full                       
│  # #  #  # ## #  #    #  # #  #                                               
│  #  # #  #    #  #    #  #  # #       To start the same way every time
│  #   ##  #    #  #    #  #   ##        set the NMON ksh variable                  
│  #    #  #    #   ####   #    #
│  ------------------------------                                                
│                                                                                  
│  Use these keys to toggle statistics on/off:                                     
│     c = CPU        l = CPU Long-term   - = Faster screen updates              
│     m = Memory     j = Filesystems     + = Slower screen updates
│     d = Disks      n = Network         V = Virtual Memory                   
│     r = Resource   N = NFS             v = Verbose hints                       
│     k = kernel     t = Top-processes   . = only busy disks/procs
│     h = more options                   q = Quit                               
│───────────────────────────────────────────────────────────────────────

2. For help, execute below command.

# nmon -h

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