Performing basic system tuning and monitoring

Monitoring system performance

The System Monitor window allows you to graphically display information about activity on your system. This includes information about CPU usage, free memory, free blocks, paging, and swapping. The System Monitor is accessible from the System folder of the scoadmin(1M) launcher, or by entering scoadmin system mon on the command line.

NOTE: Most performance management activities require a sophisticated, knowledgeable administrator. The System Monitor is only one of many tools available. See Monitoring and tuning the system for more detailed information on monitoring and tuning your system.

The System Monitor is not available in character mode.

System Monitor

The chart near the top of the System Monitor displays a line representing each of the selected monitor options. By default, no options are selected. Once selected, each is represented by a different line on the chart. As each of the monitored values change, the chart is updated. By default, the monitor updates every five seconds.

See sar(1M) for descriptions of the system monitor options.

You can change the following chart parameters:

Resize within the window: Press the left mouse button on the small square on the right side of the line that divides the top and bottom sections of the window. Hold the mouse button and move up or down to increase either the top or the bottom area.
Turn display on or off: click on the check button next to each option to turn on or off the associated display.
Change colors: click on an option and then on a color on the right side of the window. This changes the color of the line representing the previous option selected. See ``Customizing System Monitor colors'' for more information.
Change scale: click on a number in the middle of the window (10, 100, and so on) to change the scale for selected option is presented. The scale for the four ``CPU Usage'' options cannot be changed (because they can only be shown as a percentage, such as, out of 100).

You can display options, log your processor, or play back messages using the menu bar or the tool bar. Instructions for using the menu bar are given in the following sections.

To use the tool bar, click on the desired icon directly under the menu bar and the next window opens. Each icon represents a different monitor function. When you position the mouse pointer over the icon, your system identifies the icon as (from left to right): ``Options'', ``Alarm'', or ``Playback''. (``Alarm'' appears only if an option has been selected the ``List of System Monitor options''.)