Comments (1)
Hi @PavelBlend,
although this is possible in theory, it would be abysmally slow in practice. Spilling/switching domains to RAM or even SSDs is 500-2000x slower. One minute compute would turn into a day. With large simulations in the billions of cells, runtime would blow up from hours to months. This is not a feasible solution, so I'm not planning to implement this.
The problems is that the data has to be moved through bottlenecks of very slow bandwidth. With only 1 domain on the GPU, you get ~200-2000 GB/s in VRAM bandwidth (depending on GPU model); data only moves between VRAM and GPU die. Swapping domains to CPU RAM would mean that the full 16GB data has to go through PCIe in every time step at 8-16 GB/s, multiple times (8x for 128GB split into 16GB domains). Swapping to SSD means 0.5-7 GB/s, even slower.
There are 3 more viable alternatives:
- Put 128GB CPU RAM into your system and run FluidX3D on the CPU. CPU RAM has a bandwidth of 50-200GB/s, slower than GPUs but not as bad as swapping data over the PCIe bus. Some old server CPUs support 4- or 8-channel RAM, for much better bandwidth.
- Get an old X99 or Threadripper mainboard on eBay, along with 4x Tesla P40 24GB GPUs for ~$175 each - 96GB VRAM for cheap. @SLGY has a similar system with 3x K80 dual-GPUs for 72GB VRAM.
- Rent some cloud GPU server.
Kind regards,
Moritz
from fluidx3d.
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from fluidx3d.