this post was submitted on 16 Sep 2023
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I wouldn't be surprised if we end up with ram-less systems soon. A lot of programs don't need much more memory than the cache sizes already available. Things like electron bloat memory use through the roof, but even then it's likely just a gigabyte or two. Cpus will have that much cache eventually. The few applications that really need tons of memory could be offloaded to a really fast SSD, which are already becoming the standard. I imagine we'll see it in phones or tablets first, where multitasking isn't as much of a thing and physical space is at a premium.
That's just not true, here are a few off the top of my head:
RAM is actually the one resource I run out of in my day to day work as a software developer, and I get close on my gaming PC. I have a really fast SSD in my work computer (MacBook Pro) and my Linux gaming PC (some fast NVME drive), and both grind to a halt when I start swapping (Linux seems to handle it better imo). So no, I don't think SSDs are enough by any stretch of the imagination.
If anything, our need for high performance RAM is higher today than ever! My SIL just started a graphics program (graphic design or UI/UX or something), so I advised her to prioritize a high amount of RAM over a high number of CPU/GPU cores because that's how important RAM is to the user experience when deadlines approach.
Large CPU caches are great, but I don't think you can really compensate for low system memory by having large caches and a fast SSD. What is obvious, though, is that memory latency and bandwidth is an issue, so I could see more Apple-style soldered NAND next to the CPU in the coming board revisions, which isn't great for DIY systems. NAND modules are just so much cheaper to manufacturer than CPU cache, and they're also sensitive to heat, so I don't think embedding them on the CPU die is a great long term solution. I would prefer to see GPU-style memory modules either around or behind the CPU, soldered into the board, before we see on-die caches with multiple GB capacity.
Well you're right that it's not practical now. By "soon" I was thinking of like 10+ years from now. And as I said, it would likely start in systems that aren't used for those applications anyway (aside from web browsers, which use way more ram than necessary anyway). By the time it takes over the applications you listed, we'll have caches as big as our current ram anyway. And I'm using a loose definition of cache, I really just mean on-package memory of some kind. And we probably will see that GPU style memory before it's fully integrated.
It's already sort of a thing in embedded processors, such as ARM SOCs where RAM is glued to the top of the CPU package (I think the OG Raspberry Pi did that). But current iterations run the CPU way too hot for that to work, so the RAM is separate.
I could maybe see it be a thing in kiosks and other limited purpose devices (smart devices, smart watches, etc), but not for PCs, servers, or even smart phones, where we expect a lot higher memory load/multitasking.