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JavaSysMon reports useful system performance metrics cross-platform. It comes in the form of a single JAR file. See the README for detailed information on the project.

Currently it reports:

• Uptime
• Total and free RAM
• Total and free swap
• CPU usage
• CPU frequency
• Number of CPUs

If you want to add support for more metrics, the main goal is to be cross-platform. So unless someone wants to write some C to calculate load averages in Windows, for example, I won’t be putting load averages in.

Here are the ones I would like to support in future:

• Network usage (bytes in / bytes out)
• Disk IO (bytes in / bytes out)
• Processes (pid, uid, command, cpu usage, memory usage, total run time – again, whatever represents the lowest common denominator cross-platform)

Supported platforms

Supported platforms are Windows, Mac OS X, Linux, and Solaris. If you’re interested in adding support for a new platform, check out Adding support for a new platform. The more, the merrier.

The Java stuff is designed to work on Java 1.4 and higher (hence, sadly, no JUnit 4)

License

JavaSysMon is BSD licensed (to be precise: the FreeBSD 2-clause license).