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17.2.2. Using the System Monitor Tool

The Resources tab of the System Monitor tool allows you to view the amount of free and used memory on the system.
To start the System Monitor tool, either select ApplicationsSystem ToolsSystem Monitor from the Activities menu, or type gnome-system-monitor at a shell prompt. Then click the Resources tab to view the system's memory usage.
System Monitor — Resources
The Resources tab of the System Monitor application.
Figure 17.2. System Monitor — Resources

In the Memory and Swap History section, the System Monitor tool displays a graphical representation of the memory and swap usage history, as well as the total amount of the physical memory (Memory) and swap space (Swap) and how much of it is in use.