I have been setting up Zram, Swap, Swappiness and EasyOOM daemon on 16gb ram boxes, or lower. Someone asked me about 32gb of ram, or more, and I’m unsure. Wondering if others have experimented with this!
Thanks!
It’s shit info. zram is actually better, more so with high ram size+high usage situations.
Anything you’d like to dispute specifically or we should just take your “it’s shit” over a detailed explanation?
Shit info from a kernel dev who works on the memory management subsystem?
zram makes sense if you do not have swap.
zswap is probably enabled by default in most distros. It compresses cold pages on the fly so that they’re ready to quickly get swapped in and out.
I do hit the swap partition occasionally on my 32GB systems.
It doesn’t really kick in until you have proper pressure. I want my swap partition for hibernation, anyway.
zram makes sense if you do not have swap.
wrong.
zswap is probably enabled by default in most distros.
wrong
My workstation has 48 GB RAM with 50% allocation allowed to zram, no disk swapping. It works just fine. Once I use up the majority of my RAM, it kicks in the same way it would on any other system with less RAM.
Not according to the chrisdown blog post above.
What about it? I see it kicking in at least 10 GB before my RAM is full and I haven’t noticed any fundamental differences between how zram works on my 48 GB workstation and my 8 GB devices. Maybe I’ve never had a workload that filled all 48 GB + extra zram capacity, but it’s never given me an issue.
Genuinely curious: what are you doing to be needing this?
I cannot think of any modern usecase for swap a part from hybernation
Local AI can chew it up. Wasn’t able to run certain jobs on 64Gb until I switched to zswap.
Compiling Librewollf with a sufficient number of jobs is a great way to eat up 32GB of RAM, and the some.
I’ve been using lower ram machines lately, so made me curious about if people are using things like zram with 32gb+
Why do you think 32GiB is special compared to 16GiB?
And wtf is EasyOOM?You maximize the usefulness of
zramby actually increasing sappiness, and givingzramdevices high priority. e.g.sysctl vm.swappiness=100 for i in {1..8}; do swapon /dev/zram${i} -p 32767 doneThen you enable other swap devices with lower priority.
This is the way regardless of how much RAM you have. I mean, it may be pointless if you never ever exceed, let’s say 10/32GiB (including caching). But it still wouldn’t be harmful in any way.
That isn’t how swappiness works.
Changing the sysctl for
swappinessonly adjusts the ratio of anonymous and file pages, it doesn’t set a “threshold” or “aggressivity” in swapping pages, nor does it dictate how much or how little to swap.It’s generally ill-advised to touch swappiness at all unless you know what you’re doing. You can start here.
If you’re going to hand out free advice, at least make sure the advice is worth the price of admission.
If you’re going to hand out free advice, at least make sure the advice is worth the price of admission.
This is very ironic, considering your comment is a mix of straw man and wrong.
“a strawman is when people disagree with me!”
I simply haven’t had the chance to try it yet, so asking
Oh, you wrote “easy” not “early” in OP. In any case, this looks stupid. But to each their own, I guess.
