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If you don't already use it, zram swap is great for providing a little bit extra oomph. If your server doesn't have a lot of compressed data in memory, it can literally more than double your effective ram.
Doesn’t swap reduce the lifespan of storage though?
Zram swap is basically this: Turn all of your free ram into a swapdisk. Compress all access to that swapdisk.
So, it's not using you storage, buy your memory. Most stuff in memory is usually highly uncompressed - so it compresses really well.
Instead of getting the additional space from disk, it's getting it from compression.
Can you please explain to me the difference? How does a swapdisk compare to RAM? I don’t mind googling it but I highly doubt I’ll get a straightforward ELI5 style answer from there.
I would really appreciate it if you can elaborate, if you have the time that is.
Thank you.
It just compresses your ram contents so you can fit more stuff in memory at once
Basically zram is compression inside ram
There are two types of computer memory that fundamentally matter on the consumer level:
Solid state disk storage, and in particular some SD cards, can be vulnerable to excessive writes.
Ram, however, is not impacted by the number of uses.
A swap file works like this: When memory gets full, you move the least-used parts onto the swap file.
A normal swapfile is on-disk. When memory gets close to full, the system moves some onto the (much much slower, like 10-1000x) on-disk swapfile.
Zram swap creates a compressed swapfile out of your free memory. A file in linux does not have to be on a hard disk/ssd, it just has to look and quack like a file. When memory gets close to full, the system copies some onto the in-memory compressed file. This is very fast, but uses some cpu. It doesn't touch your drive storage.
That is a great explanation. It makes perfect sense to me know. Thank you