nmon

Start interactive nmon

$ nmon

$ nmon -f

$ nmon -f -s 30 -c 240

$ nmon -x

$ nmon -fdt

nmon [-h] [-s seconds] [-c count] [-f -d disks -t -r name] [-x]

nmon is a systems administrator, tuner, and benchmark tool that monitors and displays CPU, memory, network, disks, file systems, NFS, top processes, and resource information. It can run interactively or output data to a spreadsheet-compatible file.

-h

Display full help information

Enable spreadsheet output format for file recording

Set refresh interval in seconds (default: 2)

Set number of refreshes to capture

Increase disk monitoring count (default: 256)

Include top processes in spreadsheet output

Enable capacity planning mode with 15-minute intervals over 1 day (-fdt -s 900 -c 96)

Set the filename prefix for output files

In interactive mode, press "h" for help on available keyboard shortcuts. The default spreadsheet mode uses -s300 -c288 (5-minute intervals for 24 hours). Output files are in CSV format suitable for analysis tools.

nmon was created by Nigel Griffiths at IBM and has become a popular performance monitoring tool for Linux systems.

top(1), vmstat(8), iostat(1), sar(1)