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I was actually pretty far off:

> Unified memory in Linux creates a single address space accessible to both the CPU and GPU, eliminating the need to manually copy data between system RAM and video memory. It is enabled via NVIDIA's CUDA, AMD's ROCm/HIP, or generic kernel-level Heterogeneous Memory Management (HMM).

So it does exist and is available for platforms that matter.



It is interesting how apple claimed that "unified memory" is something special, and ppl believed them.

Intel and AMD had been doing this for years already, and had linux support for it from day 1.


Cool. Apple was the only one who managed to ship a consumer device with UMA and RDMA support. 2TB VRAM max over RDMA.


I think the REALLY cool thing about apple's shared memory implementation is the ultra-wide memory bus.

Otherwise, AMD is quite close to what Apple has, and Strix Halo is honestly incredible.

Not sure what RDMA brings to the table.


RDMA increases the inference performance by a significant percentage across devices connected via Thunderbolt 5.4x512 is like a 2TB machine.


Thunderbolt RDMA is slower and higher latency than if apple just gave us PCIe, where we could put a (old) connectX card in for infiniband




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