6 ms·

If you want a vramfs, why would you use GPU VRAM? CPU<->GPU copy speeds are not great. I have 192GB of CPU VRAM in my desktop and that was cheap to obtain. Abs

by dheera 2y ago

If you want a vramfs, why would you use GPU VRAM? CPU<->GPU copy speeds are not great. I have 192GB of CPU VRAM in my desktop and that was cheap to obtain. Absolute best build decision ever.

LtdJorge 2y ago
What other VRAM is there?
yjftsjthsd-h 2y ago
> I have 192GB of CPU VRAM in my desktop and that was cheap to obtain. How? Or what's "cheap" here? (Because I wouldn't call 192G of just regular RAM that's plugged into the motherboard cheap, I think everything else is more expensive, and if there's some hack here that I haven't caught I very much would like to know about it)
- dheera 2y ago
  4x48GB Corsair DDR5 sticks is about $500.* Which is pretty cheap compared to the cost of my whole build and whatever other things I've spent on. Cheap is relative, but I'm just saying that if you're going to spend $3000+ on a build, and you love to work with massive datasets, VMs, and things, $500 for a metric fuckton of RAM so that your system is never, ever swapping, is a very worthwhile thing to spend on. 192GB worth of GPU will cost you about $40000, for reference, and will be less performant if your goal is just a vramfs for CPU tasks. * Beware that using 4 DDR5 slots will cut your memory bandwidth in half on consumer motherboards and CPUs. But I willingly made that tradeoff. Maybe at some point I'll upgrade to a server motherboard and CPU.
  - brutal_chaos_ 2y ago
    Regarding *, do you know why? Shouldn't dual/quad channel be in effect?
  - yjftsjthsd-h 2y ago
    Ah, okay. Yes, if that's your reference point then just buying more RAM to plug into the motherboard is an excellent deal.
winwang 2y ago
Couple of reasons. 1. You can use vram when you don't have massive amounts of ram for a ramdisk (or /dev/shm) 2. Depending on implementation, you might have faster random seek/write than normal ram. 3. You could presumably run certain gpu kernels on the vramfs.

by dheera 2y ago

If you want a vramfs, why would you use GPU VRAM? CPU<->GPU copy speeds are not great. I have 192GB of CPU VRAM in my desktop and that was cheap to obtain. Absolute best build decision ever.

LtdJorge 2y ago

What other VRAM is there?

yjftsjthsd-h 2y ago

> I have 192GB of CPU VRAM in my desktop and that was cheap to obtain. How? Or what's "cheap" here? (Because I wouldn't call 192G of just regular RAM that's plugged into the motherboard cheap, I think everything else is more expensive, and if there's some hack here that I haven't caught I very much would like to know about it)

dheera 2y ago
4x48GB Corsair DDR5 sticks is about $500.* Which is pretty cheap compared to the cost of my whole build and whatever other things I've spent on. Cheap is relative, but I'm just saying that if you're going to spend $3000+ on a build, and you love to work with massive datasets, VMs, and things, $500 for a metric fuckton of RAM so that your system is never, ever swapping, is a very worthwhile thing to spend on. 192GB worth of GPU will cost you about $40000, for reference, and will be less performant if your goal is just a vramfs for CPU tasks. * Beware that using 4 DDR5 slots will cut your memory bandwidth in half on consumer motherboards and CPUs. But I willingly made that tradeoff. Maybe at some point I'll upgrade to a server motherboard and CPU.
- brutal_chaos_ 2y ago
  Regarding *, do you know why? Shouldn't dual/quad channel be in effect?
- yjftsjthsd-h 2y ago
  Ah, okay. Yes, if that's your reference point then just buying more RAM to plug into the motherboard is an excellent deal.

winwang 2y ago

Couple of reasons. 1. You can use vram when you don't have massive amounts of ram for a ramdisk (or /dev/shm) 2. Depending on implementation, you might have faster random seek/write than normal ram. 3. You could presumably run certain gpu kernels on the vramfs.