zramctl:tldr:7f995
The "zramctl" command is used to control the zRAM (compressed RAM) devices in Linux systems. zRAM is a kernel module that allows compressing and storing data in RAM, providing a virtual block device that can be used for swap space or as a RAM disk.
When running the "zramctl" command, it provides information and options for managing zRAM devices. Some common uses of this command are:
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Displaying information about zRAM devices: "zramctl" without any arguments will list all the zRAM devices currently available in the system. It shows details like the device ID, the size of the compressed RAM, the amount of memory used, and the compression ratio achieved.
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Creating a new zRAM device: To create a new zRAM device, you can use the "zramctl --size" option followed by the desired size in bytes, kilobytes, megabytes, or gigabytes. For example, "zramctl --size 512M" will create a 512 megabytes zRAM device.
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Removing an existing zRAM device: The "zramctl --reset" option followed by the zRAM device ID can be used to remove a zRAM device. For instance, "zramctl --reset /dev/zram0" will remove the zRAM device with device ID 0.
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Enabling or disabling zRAM swap: The "zramctl" command can be used to enable or disable zRAM devices as swap space. Enabling swap on a zRAM device is done by using the "zramctl --add" option followed by the device ID. For example, "zramctl --add /dev/zram0" will enable swap on zRAM device 0. To disable swap on a zRAM device, the "zramctl --remove" option can be used in a similar manner.
Overall, the "zramctl" command is a versatile tool for managing zRAM devices and configuring their usage in Linux systems for efficient memory compression and storage.