Multiple zram devices

[kgw]

``
2024-02-15 08:35:12 notebook1 in ~
○ → zramctl
NAME ALGORITHM DISKSIZE DATA COMPR TOTAL STREAMS MOUNTPOINT
/dev/zram1 zstd 4G 1.3M 16.7K 124K 4 /var/compressed
/dev/zram0 zstd 982.9M 4K 59B 20K 4
/dev/zram2 zstd 982.9M 4K 59B 20K 4
/dev/zram3 zstd 982.9M 4K 59B 20K 4
/dev/zram4 zstd 982.9M 4K 59B 20K 4

``
Is this just the default setup for 4 cpu processors?

[Zesko]

@kgw

Is this just the default setup for 4 cpu processors?

I guess you mean that 4 x zram devices = 4 x Core of CPU.
That is WRONG, you have 5 x zram devices /dev/ram[0,1,2,3,4]

But they have nothing to do with number of cores. Your Zram setup looks like a mess to me:

@kgw

/var/compressed

This is for your hard drive, but not RAM.

• Would you like to swap the cache to the hard drive? → If yes, why not zswap?
  I am pretty sure, zswap is default. You don’t need to set it up manually.

OR

• One Zram device is sufficient in most cases
  • You have to disable zswap manually.
  • swap cache should be compressed in RAM, not in the hard drive.

You should follow Arch wiki. Do not follow false info in random websites.

[Nachlese]

Correct.
No one knows what you did to get the result that you saw and posted.

See also the link to the Arch Wiki:

zram - ArchWiki

[kgw]

OK! Followed the Arch Wiki…
``
cat /proc/swaps

Filename Type Size Used Priority
/dev/zram0 partition 8052260 0 100
``
Thanks for your encouragement

[cscs]

Just to mention. Thats ~8gb. Which is pretty modest. We dont know your physical ram size, but in my case with 16gb of memory (actually 13.5 available) I still need double that in zram in order to successfully compile the largest packages.
While such a big SWAP may not be a requirement for you… I would like to mention at least that zram is functional, along with compression, up to that size or larger.
For example. If using zram-generator;

[zram0]
zram-size = ram * 2
compression-algorithm = zstd
swap-priority = 100
fs-type = swap

(note the arithmetic of “ram/2” or “ram*2”, which can be augmented any which way)

[kgw]

I think I’ve got it:
``
2024-02-18 15:42:17 notebook1 in ~
○ → lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sda 8:0 0 931.5G 0 disk
├─sda1 8:1 0 300M 0 part /boot/efi
└─sda2 8:2 0 931.2G 0 part /
zram0 254:0 0 7.5G 0 disk [SWAP]
‘’
Thanks!