So what's Sysmon anyway? In short, Sysmon is a lightweight Linux-based system resource tracing tool, as vmstat does, but has more information. The output includes the CPU/memory usage, swapping/paging, interrupts and each network card's statistics, which includes interrupts to kernel, packets and bytes that received and sent in a specified interval. Sysmon can run as a daemon and log the system information for a long period. Help menu:
Usage: sysmon [-hwWbk] [-i interface-name] [-r repeat] [-t test-interval] [-T test-time]
[-h] Printout help messages.
[-w] Write all results to a file. Disable by default.
[-W] Write statistics of each network device to separate files. Disable by default.
[-b] Background (daemon) mode. Only valid when write option is defined.
[-k] Kill the sysmon background process (daemon). Disable by default.
[-i interface-name] Define the network device name (e.g. eth0). Monitor all if no interface defined.
[-r repeat] Repetition of monitoring. 10 times by default.
[-t test-interval] The interval (sample time) between each tracing in seconds. 2 seconds by default.
[-T test-time] The duration of system monitoring in minutes. Valid only write option defined.
[-o output] Specify the output (log) filename. Implies the write option.
Note: Default logfile has format of host-start-time.log if write option (-w) is defined.
Use "ifconfig" to check the network devices in your computer.
Possible names: eth0, wlan0, elan0, etc (defined by NETNAME in util.h). loop is for loopback address.
Example 1 (Monitor all network devices, very long format): % sysmon
Example 2 (Only monitor eth0): % sysmon -r 10 -t 2 -i eth0
Example 3 (Log every 10 minutes for one week, run as daemon): % sysmon -bw -i eth0 -t 600 -T 10080
Output format:
Network information: [interrupts] [recv-packets] [recv-bytes] [sent-packets] [sent-bytes]
