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zram: Compressed RAM based block devices
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Project home: http://compcache.googlecode.com/
* Introduction
The zram module creates RAM based block devices: /dev/ramX (X = 0, 1, ...).
Pages written to these disks are compressed and stored in memory itself.
These disks allow very fast I/O and compression provides good amounts of
memory savings.
See project home for use cases, performance numbers and a lot more.
Individual zram devices are configured and initialized using zramconfig
userspace utility as shown in examples below. See zramconfig man page for
more details.
* Usage
Following shows a typical sequence of steps for using zram.
1) Load Modules:
modprobe zram num_devices=4
This creates 4 (uninitialized) devices: /dev/zram{0,1,2,3}
(num_devices parameter is optional. Default: 1)
2) Initialize:
Use zramconfig utility to configure and initialize individual
zram devices. For example:
zramconfig /dev/zram0 --init # uses default value of disksize_kb
zramconfig /dev/zram1 --disksize_kb=102400 # 100MB /dev/zram1
*See zramconfig man page for more details and examples*
3) Activate:
mkswap /dev/zram0
swapon /dev/zram0
mkfs.ext4 /dev/zram1
mount /dev/zram1 /tmp
4) Stats:
zramconfig /dev/zram0 --stats
zramconfig /dev/zram1 --stats
5) Deactivate:
swapoff /dev/zram0
umount /dev/zram1
6) Reset:
zramconfig /dev/zram0 --reset
zramconfig /dev/zram1 --reset
(This frees memory allocated for the given device).
Please report any problems at:
- Mailing list: linux-mm-cc at laptop dot org
- Issue tracker: http://code.google.com/p/compcache/issues/list
Nitin Gupta
ngupta@vflare.org
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