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

From	Mild Shock <janburse@fastmail.fm>
Newsgroups	sci.logic
Subject	FYI: Unified Memory Architecture (UMA) (Re: Implementing Gas for a Compute Shader [Avoid TDR])
Date	2026-07-09 19:43 +0200
Message-ID	<112omk9$8oqk$2@solani.org> (permalink)
References	<10seeh6$rsl4$2@solani.org> <10siao0$ud5u$2@solani.org> <112nnji$81rj$3@solani.org>

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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
 >

Thread

Paul Tarau versus Mr. Taskmanager, who would win? [A PDP-11 Humunkulus from 1979] Mild Shock <janburse@fastmail.fm> - 2026-04-24 02:46 +0200
  AI dooms day escape: Güttinger Wald (Re: Paul Tarau versus Mr. Taskmanager, who would win?) Mild Shock <janburse@fastmail.fm> - 2026-04-25 14:06 +0200
    Elmos Fascist Dreams of a 365 Prolog (Was: AI dooms day escape: Güttinger Wald) Mild Shock <janburse@fastmail.fm> - 2026-05-09 12:52 +0200
      Even the Buddos are clueless [Did Tarau see Liliputians?] (Re: Elmos Fascist Dreams of a 365 Prolog) Mild Shock <janburse@fastmail.fm> - 2026-05-09 15:19 +0200
        Halfing the AI Laptop Budget: Ne-Meow sold out! (Re: Even the Buddos are clueless [Did Tarau see Liliputians?]) Mild Shock <janburse@fastmail.fm> - 2026-05-10 09:09 +0200
    Prolog Expert Ginis (PEGs) on a Keychain (Re: AI dooms day escape: Güttinger Wald) Mild Shock <janburse@fastmail.fm> - 2026-06-20 13:04 +0800
      Chatbot Classified as a Weapon (Re: Prolog Expert Ginis (PEGs) on a Keychain) Mild Shock <janburse@fastmail.fm> - 2026-06-21 05:39 +0800
      Introduction to AI Accelerator Prolog [π-WAM of Dogelog] (Re: Prolog Expert Ginis (PEGs) on a Keychain) Mild Shock <janburse@fastmail.fm> - 2026-07-17 11:16 +0200
        Not praying to the god of lambda calculus [π beats α] (Re: Introduction to AI Accelerator Prolog [π-WAM of Dogelog]) Mild Shock <janburse@fastmail.fm> - 2026-07-17 11:17 +0200
        Re: Introduction to AI Accelerator Prolog [π-WAM of Dogelog] (Re: Prolog Expert Ginis (PEGs) on a Keychain) "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-07-17 13:03 -0700
          pi in pi-WAM refers to pi-calculus (Was: Introduction to AI Accelerator Prolog [π-WAM of Dogelog] ) Mild Shock <janburse@fastmail.fm> - 2026-07-18 01:16 +0200
            Milners fickle() in pi-WAM [For fun and profit] (Re: pi in pi-WAM refers to pi-calculus) Mild Shock <janburse@fastmail.fm> - 2026-07-18 01:50 +0200
    AI Laptops are just strange novel xBoxes (Was: AI dooms day escape: Güttinger Wald) Mild Shock <janburse@fastmail.fm> - 2026-07-08 20:44 +0200
      Re: AI Laptops are just strange novel xBoxes (Was: AI dooms day escape: Güttinger Wald) "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-07-08 15:22 -0700
        TDR solutions --> work slicing (Was: AI Laptops are just strange novel xBoxes) Mild Shock <janburse@fastmail.fm> - 2026-07-09 09:47 +0200
          Thinking of Chris M. Thomasson: From shadertoys to computetoys? (Re: TDR solutions --> work slicing) Mild Shock <janburse@fastmail.fm> - 2026-07-09 09:52 +0200
    FYI: Unified Memory Architecture (UMA) (Re: Implementing Gas for a Compute Shader [Avoid TDR]) Mild Shock <janburse@fastmail.fm> - 2026-07-09 19:43 +0200
      The Wider von Neumann Neck (Re: FYI: Unified Memory Architecture (UMA)) Mild Shock <janburse@fastmail.fm> - 2026-07-10 07:51 +0200
        The new MIMD Warp is the cherry on top (Re: The Wider von Neumann Neck) Mild Shock <janburse@fastmail.fm> - 2026-07-10 08:08 +0200
        Dumbwit, just run it on your RTX 5070 trash (Re: The Wider von Neumann Neck) Mild Shock <janburse@fastmail.fm> - 2026-07-10 15:49 +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 22:45 +0200
            404 Brain not Found [GPU saturation] (Re: We are still waiting for results! [Confused Dumbwit]) Mild Shock <janburse@fastmail.fm> - 2026-07-10 23:40 +0200
              I nowhere talked about 10GB/s (Re: 404 Brain not Found [GPU saturation]) Mild Shock <janburse@fastmail.fm> - 2026-07-10 23:41 +0200
                I nowhere said something about AI (Re: I nowhere talked about 10GB/s) Mild Shock <janburse@fastmail.fm> - 2026-07-10 23:52 +0200
                What do you not understand in "budget"? (Re: I nowhere said something about AI) Mild Shock <janburse@fastmail.fm> - 2026-07-11 00:08 +0200
                SWI makes only MLips not GLips (Re: What do you not understand in "budget"?) Mild Shock <janburse@fastmail.fm> - 2026-07-11 00:09 +0200
                micro penis got hurt by "budget" (Re: SWI makes only MLips not GLips) Mild Shock <janburse@fastmail.fm> - 2026-07-12 19:20 +0200
  Micro Penis Nemesis: Shoe String Budget π-WAM (Was: Paul Tarau versus Mr. Taskmanager, who would win?) Mild Shock <janburse@fastmail.fm> - 2026-07-12 19:26 +0200
    micro penis struggels with mobile grade GPU concept [Redmi Note 14 Pro+ Results] (Re: Micro Penis Nemesis: Shoe String Budget π-WAM) Mild Shock <janburse@fastmail.fm> - 2026-07-12 21:32 +0200
      Micro Penis Existential Crisis: DeepSeek on a Mobile GPU (Re: micro penis struggels with mobile grade GPU concept [Redmi Note 14 Pro+ Results]) Mild Shock <janburse@fastmail.fm> - 2026-07-12 21:47 +0200
        Micro Penis is worse than Sleepy Joe (Re: Micro Penis Existential Crisis: DeepSeek on a Mobile GPU) Mild Shock <janburse@fastmail.fm> - 2026-07-12 23:00 +0200
          Maybe change your pampers? (Was: Micro Penis is worse than Sleepy Joe) Mild Shock <janburse@fastmail.fm> - 2026-07-12 23:01 +0200
            herpes blister rossy boy is confused (Re: Maybe change your pampers?) Mild Shock <janburse@fastmail.fm> - 2026-07-13 06:54 +0200
              nothing gets blocked except your brain [LPDDR5X-RAM] (Re: herpes blister rossy boy is confused) Mild Shock <janburse@fastmail.fm> - 2026-07-13 13:21 +0200
                flogging a dead horse PCI VRAM graphic cards (Re: nothing gets blocked except your brain [LPDDR5X-RAM]) Mild Shock <janburse@fastmail.fm> - 2026-07-13 13:52 +0200

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