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FYI: Unified Memory Architecture (UMA) (Re: Implementing Gas for a Compute Shader [Avoid TDR])

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Hi,

These novel GPUs , that are part of AI Laptops,
feature Unified Memory Architecture (UMA).
In the case of my Ryzen the main memory is 32 GB,

and the GPU can access 16 GB. It is a design where
CPUs and GPUs share a single coherent memory space,
eliminating the need for separate host and

accelerator memory. Nevertheless the WebGPU API,
works with some copy and synchronization semantics
and buffer abstractions, which is not a big loss.

But all buffers reside in the same AI Lapop
RAM. And the MIMD architecture allows instructions
where seperate threads access the same

memory location, either for read or for write.
There is also a data type atomic(T), which
features operation such as AtomicAdd() etc.. etc..

BTW, I made a GitHub project of my exploration:

11.4 Giga Lips with a Budget Laptop
https://github.com/Jean-Luc-Picard-2021/gigabudget

BTW, pi-WAM is nevertheless optimized to have
no memory contention. On the other hand pi-WAM
is happy to access large memory areas.

Bye

BTW: The grandmother of these novel GPUs
is NVIDIAs Volta which already appeared in
2017, meanwhile we have 2026.

See also:

Starting with the NVIDIA Volta architecture,
Independent Thread Scheduling allows full
concurrency between threads, regardless of warp.
https://forums.developer.nvidia.com/t/back-to-simd/311983

The AMD Radeon 860M is an integrated graphics
processor that does not have its own dedicated
VRAM. Instead, it dynamically shares up to 50%
of your total system RAM with the CPU in a
standard Windows configuration.
https://www.amd.com/en/blogs/2025/faqs-amd-variable-graphics-memory-vram-ai-model-sizes-quantization-mcp-more.html

Ryann Likunov schrieb:
 > Mild Shock wrote:
 >
 >> Hi,
 >>
 >> I guess, you can read off how to do it here,
 >> i.e. avoid TDR (DXGI_ERROR_DEVICE_HUNG 0x887A0006). The below compute
 >> toys example has a similar
 >>
 >> approach, just like my π-WAM and Hack GPU backend,
 >> that is based on a Instruction Set Architecture (ISA):
 >
 > how come they are not able to map the local RAM
 > as gpu arrays for using them as local AI resource
 >

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Thread

Implementing Gas for a Compute Shader [Avoid TDR] (Re: AI dooms day escape: Güttinger Wald) Mild Shock <janburse@fastmail.fm> - 2026-07-09 10:49 +0200
  FYI: Unified Memory Architecture (UMA) (Re: Implementing Gas for a Compute Shader [Avoid TDR]) Mild Shock <janburse@fastmail.fm> - 2026-07-09 19:45 +0200
    he Wider von Neumann Neck (Re: FYI: Unified Memory Architecture (UMA)) Mild Shock <janburse@fastmail.fm> - 2026-07-10 07:49 +0200
      Mac Neo: The dwarf with giant GPU muscles [macOS IOGPUFamily] (Re: The new MIMD Warp is the cherry on top) Mild Shock <janburse@fastmail.fm> - 2026-07-10 08:29 +0200
      Dumbwit, just run it on your RTX 5070 trash (Re: he Wider von Neumann Neck) Mild Shock <janburse@fastmail.fm> - 2026-07-10 15:47 +0200
        We are waiting Dumbwit: 1 Month, 3 Months, .. [node.js dawn] (Re: Dumbwit, just run it on your RTX 5070 trash) Mild Shock <janburse@fastmail.fm> - 2026-07-10 16:29 +0200
          We are still waiting for results! [Confused Dumbwit] (Re: We are waiting Dumbwit: 1 Month, 3 Months, .. [node.js dawn]) Mild Shock <janburse@fastmail.fm> - 2026-07-10 22:47 +0200
            404 Brain not Found [GPU saturation] (Re: We are still waiting for results! [Confused Dumbwit]) Mild Shock <janburse@fastmail.fm> - 2026-07-10 23:42 +0200
              I nowhere talked about 10GB/s (Re: 404 Brain not Found [GPU saturation]) Mild Shock <janburse@fastmail.fm> - 2026-07-10 23:43 +0200
                I nowhere said something about AI (Re: I nowhere talked about 10GB/s) Mild Shock <janburse@fastmail.fm> - 2026-07-10 23:51 +0200
                Re: I nowhere said something about AI (Re: I nowhere talked about 10GB/s) Mild Shock <janburse@fastmail.fm> - 2026-07-11 00:09 +0200

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