21–30 of 132 posts
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I dont get why anti-swap is so prevalent in Linux discussions. Like, what does it hurt to stick 8-16-32gb extra "oh fuck" space on your drive. Either you're going to never exhaust your system ram, so it doesn't matter, minimally exhaust it and swap in some peak load but at least nothing goes down, or exhaust it all and start having things get OOM'd which feels bad to me. Am I out of touch? Surely it's the children wh…
The pro-swap stance has never made sense to me because it feels like a logical loop. There’s a common rule of thumb that says you should have swap space equal to some multiple of your RAM. For instance, if I have 8 GB of RAM, people recommend adding 8 GB of swap. But since I like having plenty of memory, I install 16 GB of RAM instead—and yet, people still tell me to use swap. Why? At that point, I already have the s…
The proper rule of thumb is to make the swap large enough to keep all inactive anonymous pages after the workload has stabilized, but not too large to cause swap thrashing and a delayed OOM kill if a fast memory leak happens.
Another useless feature into Linux kernel. Who uses swap space nowadays?! Last time I used swap on Linux device was around Pentium 2 era but in reality closer to 486DX era
You should still use swap. It's not "2x RAM" as advice anymore, and hasn't been for years: https://chrisdown.name/2018/01/02/in-defence-of-swap.html tl;dr; give it 4-8GB and forget about it.
One pet peeve I have with virtual memory management on Linux is that, as memory usage approaches 100%, the kernel starts evicting executable pages because technically they're read-only and can be loaded from disk. Thus, the entire system grinds to a halt in a behavior that looks like swapping, because every program that wants to execute instructions has to load its instructions from disk again, only to have those ins…
Any combination of cgroups, /proc flags and other forbidden knobs to get such behaviour?
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You should still use swap. It's not "2x RAM" as advice anymore, and hasn't been for years: https://chrisdown.name/2018/01/02/in-defence-of-swap.html tl;dr; give it 4-8GB and forget about it.
I've heard "square root of physical memory" as a heuristic, although in practice I use less than this with some of my larger systems.
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It's unloved on Linux because using Linux under memory pressure sucks. But that's not a good reason to abandon improvements. Even more so with the direction RAM prices are headed
It sucks without proper cgroup limits because swap makes OOM slower to trigger. Either set the cgroup limits or make the swap small.
Earlier quoted context omitted.
I dont get why anti-swap is so prevalent in Linux discussions. Like, what does it hurt to stick 8-16-32gb extra "oh fuck" space on your drive. Either you're going to never exhaust your system ram, so it doesn't matter, minimally exhaust it and swap in some peak load but at least nothing goes down, or exhaust it all and start having things get OOM'd which feels bad to me. Am I out of touch? Surely it's the children wh…
The pro-swap stance has never made sense to me because it feels like a logical loop. There’s a common rule of thumb that says you should have swap space equal to some multiple of your RAM. For instance, if I have 8 GB of RAM, people recommend adding 8 GB of swap. But since I like having plenty of memory, I install 16 GB of RAM instead—and yet, people still tell me to use swap. Why? At that point, I already have the s…
Also, as has been pointed out by another commenter, 8GB of swap for a system with 8GB of physical memory is overkill.
Earlier quoted context omitted.
The pro-swap stance has never made sense to me because it feels like a logical loop. There’s a common rule of thumb that says you should have swap space equal to some multiple of your RAM. For instance, if I have 8 GB of RAM, people recommend adding 8 GB of swap. But since I like having plenty of memory, I install 16 GB of RAM instead—and yet, people still tell me to use swap. Why? At that point, I already have the s…
This rule of thumb is outdated by two decades. The proper rule of thumb is to make the swap large enough to keep all inactive anonymous pages after the workload has stabilized, but not too large to cause swap thrashing and a delayed OOM kill if a fast memory leak happens.
Earlier quoted context omitted.
The pro-swap stance has never made sense to me because it feels like a logical loop. There’s a common rule of thumb that says you should have swap space equal to some multiple of your RAM. For instance, if I have 8 GB of RAM, people recommend adding 8 GB of swap. But since I like having plenty of memory, I install 16 GB of RAM instead—and yet, people still tell me to use swap. Why? At that point, I already have the s…
You're implying that people are telling you to set up swap without any reason, when in fact there are good reasons - namely dealing with memory pressure. Maybe you could fit so much RAM into your computer that you never hit pressure - but why would you do that vs allocating a few GB of disk space for swap? Also, as has been pointed out by another commenter, 8GB of swap for a system with 8GB of physical memory is over…