nmon is short for Nigel’s Performance Monitor. It is a systems administrator, tuner, benchmark tool. It can display the CPU, memory, network, disks (mini graphs or numbers), file systems, NFS, top processes, resources (Linux version & processors) and on Power micro-partition information.
Data is displayed on the screen and updated once every two seconds, using a dumb screen. However, you can easily change this interval to a longer or shorter time period.
The nmon tool can also capture the same data to a text file for later analysis and graphing for reports. The output is in a spreadsheet format (.csv). nmon for Linux was an internal project at IBM for many years and was released to open source under GPL on 27th July 2009.
- CPU utilization.
- Memory use.
- Kernel statistics and run queue information.
- Disks I/O rates, transfers, and read/write ratios.
- Free space on file systems.
- Disk adapters.
- Network I/O rates, transfers, and read/write ratios.
- Paging space and paging rates.
- CPU and AIX specification.
- Top processors.
- IBM HTTP Web cache.
- User-defined disk groups.
- Machine details and resources.
- Asynchronous I/O — AIX only.
- Workload Manager (WLM) — AIX only.
- IBM TotalStorage Enterprise Storage Server (ESS) disks — AIX only.
- Network File System (NFS).
- Dynamic LPAR (DLPAR) changes.
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