On 12/5/20 11:56 PM, Sreyan Chakravarty wrote:
On Sun, Dec 6, 2020 at 11:13 AM Chris Murphy <lists@xxxxxxxxxxxxxxxxx
<mailto:lists@xxxxxxxxxxxxxxxxx>> wrote:
https://fedoraproject.org/wiki/Changes/SwapOnZRAM#Detailed_Description
<https://fedoraproject.org/wiki/Changes/SwapOnZRAM#Detailed_Description>
Let me know if you have questions not answered there. A key point is
this is not a preallocation. Creating a 4G /dev/zram0 device doesn't
reserve or consume 4G. It's dynamically allocated, and even once full
it's not using that amount of memory, instead actual memory consumed
is related to the compression ratio achieved. Typical is 1 to 1.5G
memory consumption to swap out 4G worth of pages, for a net gain of
2.5G - 3G memory for use by other programs. And without having to
write to disk at all.
Not perfect, and not magic. It does have some tradeoffs.
I have a follow up question.
Why not just disable swap entirely, rather than keeping a swap store in
memory ?
Then when you run out of memory, your system will choke until the OOM
killer kills some process.
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