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I need a ramdisk who handle transparent realtime compression on write and decompression on read.

Example : I use /dev/shm, or I create a new tmpfs, mount it writeable and compressed.

I wrote and read about 500 Mb - 1 GB of text files. The files' content is not fixed, every few seconds the files are updated.

So squashfs / zramswap seems not to fit my goal.

I wonder about fusecompress or other solutions.

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1 Answer 1

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It seems it is possible to use zram without swap.

This script create a ram disk, maximum ram usage is 256 Mbyte. You can run it with sudo or put the script in /etc/init.d/

#!/bin/bash

modprobe zram num_devices=1 
# max ram usage = 256 Mbytes
echo 256M > /sys/block/zram0/disksize
mke2fs -q -m 0 -b 4096 -O sparse_super -L zram /dev/zram0
mount -o relatime,noexec,nosuid /dev/zram0 /mnt/zram
# eof
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4
  • kernel.org/doc/Documentation/blockdev/zram.txt The value can be either in bytes or you can use mem suffixes. Example: echo 512M > /sys/block/zram0/disksize
    – Massimo
    Commented Dec 29, 2015 at 11:20
  • What is the purpose of mentioned mount options?
    – Victor Yarema
    Commented Oct 9, 2017 at 12:11
  • modprobe zram just do nothing when zram module is already loaded.
    – Victor Yarema
    Commented Oct 9, 2017 at 12:18
  • As written might not free memory after files are deleted (on my system I encountered the issue), need to run fstrim to make memory available again. discard mount option might be doing same "automatically", now I'm testing it. Cheers and thanks.
    – Alex Martian
    Commented Nov 11, 2022 at 13:23

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