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17. Server Operating System > Unix OS Monitoring Tools

Unix OS Monitoring Tools

Most versions of Unix collect performance metrics once per second from the kernel, so most Unix performance monitoring facilities do not allow a sample rate of greater than once per second. You wouldn’t want to do much more monitoring of general statistics anyway, because the measurement itself would significantly add to the load. Read the manpage on each of these for more detailed information. The following sections describe the major monitoring tools and provide some example output on a heavily loaded web server.

ps

The most basic tool to let you know what’s going on is ps, which displays all your processes along with information on CPU and memory usage. The options to


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