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How to create faster smaller swap space

oshanwisumperuma profile image Oshan Wisumperuma Updated on ・1 min read

Even though swap is not necessary for the most of use cases, but developers might need swap space when doing a big compilation, browsing on chrome or on slack. but it is a really painful experience using a swap partition on Disk space. ZRAM helps us allocate small storage from RAM as swap space and store 3,4 times of data on that space. its even faster than the SSD swap partitions because this is a ram drive.

Since zstd has an excellent compression ratio, 2GB of zram space will have total swap capacity around 6GB. please note that these commands are only tested on Fedora 32. All the changes will be lost in the next reboot.

$ modprobe zram num_devices=2
$ echo zstd > /sys/block/zram0/comp_algorithm
$ echo 2G > /sys/block/zram0/disksize
$ mkswap --label zram0 /dev/zram0
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enable the swap partition with higher priority

$ swapon --priority 1 /dev/zram0

Tadaa! 🎉 now we can open another chrome tab ;-)

$ free -h
              total        used        free      shared  buff/cache   available
Mem:           15Gi       7.3Gi       1.8Gi       1.5Gi       6.4Gi       6.4Gi
Swap:         2.0Gi       5.0Mi       2.0Gi

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to disable the swap storage

$ swapoff /dev/zram0

update: zram is enabled by default

Discussion

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loouislow profile image
Loouis Low

I install preload to automatically adjust the swap for me. Install and forget, no hassle.