nmon

What nmon is

nmon is a free Linux tool for systems administration, tuning, and benchmarking that collects performance information. It shows live metrics in a terminal through a curses interface, with keyboard controls for enabling or disabling data types. Metrics can include CPU, memory, network, disks, filesystems, NFS, and top processes; the Linux version also displays resources and processors. Users can save performance data to a comma-separated file for later analysis or longer-term capture. nmonchart turns saved output into webpage graphs, while nmon Analyser loads it into an Excel spreadsheet and creates graphs. The project also describes njmon injectors for adding JSON data to InfluxDB and Splunk, and real-time graphing with InfluxDB and Grafana. Binaries are listed for POWER and x86/AMD64 Linux distributions, as well as separate mainframe builds; supported platforms also include ARM. If there is no matching binary, the site says to compile from source using GCC and the ncurses development library. The Linux project is listed under GPLv3. nmon for AIX is integrated into the AIX topas command and is not open source.