About nmon
nmon is a powerful performance monitoring tool for Linux, AIX, and ARM-based systems, including Raspberry Pi. It provides real-time system metrics such as CPU, memory, disk, network, and process activity, displayed in an interactive terminal interface. Data can be logged to CSV for later analysis, with visualization tools like nmonchart and nmon Analyser for Excel. Lightweight, easy to use, and supporting multiple architectures, nmon is ideal for system administrators, tuners, and benchmarking.
FAQ
For AIX 5.3 TL09+, AIX 6.1 TL02+, and AIX 7, use the nmon that comes with AIX. For earlier versions, use nmon classic. For Linux, download nmon from the official website (http://nmon.sourceforge.net), which supports 50 different platforms.
nmon disconnects from the shell during data capture to continue running in the background, even if you log out. To check if it's still running, use the command: ps -ef | grep nmon.
Use the -F option, which must be the first option on the command line. For example: nmon -F mydata.nmon.
The default filename is _ .nmon. This format ensures files sort by machine and then by date and time.
Use a FIFO (named pipe) with the -F option. For example: mkfifo /tmp/xyz; nmon -F /tmp/xyz s 5 c 300; your-command </tmp/xyz.
Support options include paying the developer, using IBM Tivoli Performance Monitoring with support, or raising a bug on the SourceForge project page. For AIX, you can also raise an IBM Problem Report (PMR).
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