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indexterm:[gnome-system-monitor]indexterm:[System Monitor] The `Resources` tab of the [application]*System Monitor* tool allows you to view the amount of free and used memory on the system.
To start the [application]*System Monitor* tool, either select menu:Applications[System Tools > `System Monitor`pass:attributes[{blank}]] from the Activities menu, or type [command]#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.
system-monitor-resources.png
In the `Memory and Swap History` section, the [application]*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.
Viewing CPU Usage
indexterm:[system information,cpu usage]indexterm:[CPU usage]
indexterm:[gnome-system-monitor]indexterm:[System Monitor] The `Resources` tab of the [application]*System Monitor* tool allows you to view the current CPU usage on the system.
To start the [application]*System Monitor* tool, either select menu:Applications[System Tools > `System Monitor`pass:attributes[{blank}]] from the Activities menu, or type [command]#gnome-system-monitor# at a shell prompt. Then click the `Resources` tab to view the system's CPU usage.
In the `CPU History` section, the [application]*System Monitor* tool displays a graphical representation of the CPU usage history and shows the percentage of how much CPU is currently in use.
Viewing Block Devices and File Systems
indexterm:[system information,file systems]indexterm:[file systems]
Using the lsblk Command
indexterm:[lsblk] The [command]#lsblk# command allows you to display a list of available block devices. To do so, type the following at a shell prompt:
[command]#lsblk#
For each listed block device, the [command]#lsblk# command displays the device name (`NAME`), major and minor device number (`MAJ:MIN`), if the device is removable (`RM`), what is its size (`SIZE`), if the device is read-only (`RO`), what type is it (`TYPE`), and where the device is mounted (`MOUNTPOINT`). For example:
By default, [command]#lsblk# lists block devices in a tree-like format. To display the information as an ordinary list, add the [option]`-l` command line option:
[command]#lsblk# [option]`-l`
For a complete list of available command line options, refer to the *lsblk*(8) manual page.