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Because of MIMD you have to reassess algorithms (Re: I never used OpenGL Version 4.2 and later)

From Mild Shock <janburse@fastmail.fm>
Newsgroups sci.logic, comp.lang.prolog, sci.physics
Subject Because of MIMD you have to reassess algorithms (Re: I never used OpenGL Version 4.2 and later)
Date 2026-07-21 09:02 +0200
Message-ID <113n5j3$5ouq$3@solani.org> (permalink)
References (2 earlier) <113kfgk$3b4e$2@solani.org> <113m3q9$5496$2@solani.org> <113m6l8$561a$2@solani.org> <113mco7$1j9n2$1@dont-email.me> <113n4m3$5oih$1@solani.org>

Cross-posted to 3 groups.

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Hi,

Because of MIMD you have to reassess algorithms.
A spin loop which could really hurt non-MIMD
GPUs, might less hurt a MIMD GPU.

Basically you have to reassess algorithms. Be
very exact whether your claims relates to
non-MIMD or to MIMD. You can toy around

with WebGL, mainly made for non-MIMD, here:

https://www.shadertoy.com/

and with WegGPU, mainly made for MIMD, here:

https://compute.toys/

The compute toys page, supports two shader
languages, WGSL and Slang. I made my GPU
experiments only with WGSL.

So I don't know Slang either. Things I
don't know in the GPU world are:

- OpenGL 4.2 and later
- Slang https://shader-slang.org/
- CUDA https://de.wikipedia.org/wiki/CUDA

Things I have meanwhile hands on, and which
I plan to integrate into library(edge/brainfog):

- WGSL https://webgpufundamentals.org/

Bye

Mild Shock schrieb:
> Hi,
> 
> I went to holdays in June 2026, had an idea for
> a pi-WAM based on a Hack, the later is described here:
> 
> Emulating π-WAM in Dogelog Player
> https://medium.com/2989/de9cd29c7d37
> 
> The Elements of Computing Systems
> https://mitpress.mit.edu/9780262539807
> 
> In July 2026 I did the CPU and GPU experiments,
> moving from emulator to native executor based in
> realizing Hack as a concrete virtual machine,
> 
> and not as an abstract machine emulated in Prolog.
> The GPU experiments were done in WebGPU / WGSL.
> So no, I never used OpenGL Version 4.2 and later.
> 
> Also the name imageAtomicAdd indicates that it
> imageAtomicAdd is rather from a render shader,
> while my GPU experiment uses a compute shader.
> 
> Es specially I need GPU compute shaders, which
> are not executed in lock step, but rather have
> indepdendent thread state, also known as MIMD.
> 
> "In computing, multiple instruction, multiple
> data (MIMD) is a technique employed to
> achieve parallelism. "
> https://en.wikipedia.org/wiki/Multiple_instruction,_multiple_data
> 
> MIMID showed up 2017 with NVIDIA Volta cards.
> But is now realized by Intel Arc, Snapdragon Adreno
> and AMD RDNA as well.
> 
> Bye
> 
> Chris M. Thomasson schrieb:
>> On 7/20/2026 3:15 PM, Mild Shock wrote:
>> [...]
>>
>> Have you ever used imageAtomicAdd before?
>>
>

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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
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                Glue Sniffing 5-Year Old Moron [CCCP Troll] (Was: Play stupid games, win classic Usenet prizes [CCCP Troll]) Mild Shock <janburse@fastmail.fm> - 2026-07-22 14:29 +0200
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            Re: Just RTFM the RDNA 3.5 specs! [GPU Cache Lines] (Re: The Cache Identity Crisis by Micro Penis) Ross Finlayson <ross.a.finlayson@gmail.com> - 2026-07-20 21:36 -0700
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                Re: rossy boy is going paranoid (Was: Just RTFM the RDNA 3.5 specs! [GPU Cache Lines]) Ross Finlayson <ross.a.finlayson@gmail.com> - 2026-07-21 00:56 -0700
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            Well thats good, co-location, onto the same processor die (Re: GPU Cache Hierarchy: Understanding L1, L2, and VRAM (Was: L1,..,Ln caches are located on the CPU AND on the GPU) Mild Shock <janburse@fastmail.fm> - 2026-07-20 22:02 +0200
              Where is micro penis mental error? (Re: Well thats good, co-location, onto the same processor die (Re: GPU Cache Hierarchy: Understanding L1, L2, and VRAM (Was: L1,..,Ln caches are located on the CPU AND on the GPU) Mild Shock <janburse@fastmail.fm> - 2026-07-20 22:07 +0200
      I didn't find Futex in WebGPU / WGSL (Re: Gemini, DeepSeek, OpenAI all know Dmitriy V'jukov) Mild Shock <janburse@fastmail.fm> - 2026-07-20 23:26 +0200
        There is no imageAtomicAdd in WGSL (Re: I didn't find Futex in WebGPU / WGSL) Mild Shock <janburse@fastmail.fm> - 2026-07-21 00:15 +0200
          OpenGL is dead. Apple said bye bye / Wayland Compositor (Re: There is no imageAtomicAdd in WGSL) Mild Shock <janburse@fastmail.fm> - 2026-07-21 00:26 +0200
          Flogging a Dead Horse, OpenGL is EOL (Re: There is no imageAtomicAdd in WGSL) Mild Shock <janburse@fastmail.fm> - 2026-07-21 01:39 +0200
            imageAtomicAdd trivial, Dmitry Vyukov requires capacity (Re: Flogging a Dead Horse, OpenGL is EOL) Mild Shock <janburse@fastmail.fm> - 2026-07-21 01:40 +0200
              capacity = 2^n for some n / systolic system (Re: imageAtomicAdd trivial, Dmitry Vyukov requires capacity) Mild Shock <janburse@fastmail.fm> - 2026-07-21 01:41 +0200
                Source of the benchmark for DmitryVyukov (Was: capacity = 2^n for some n / systolic system) Mild Shock <janburse@fastmail.fm> - 2026-07-21 01:44 +0200
          Re: There is no imageAtomicAdd in WGSL (Re: I didn't find Futex in WebGPU / WGSL) "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-07-20 16:59 -0700
            I never used OpenGL Version 4.2 and later (Was: There is no imageAtomicAdd in WGSL) Mild Shock <janburse@fastmail.fm> - 2026-07-21 08:47 +0200
              Because of MIMD you have to reassess algorithms (Re: I never used OpenGL Version 4.2 and later) Mild Shock <janburse@fastmail.fm> - 2026-07-21 09:02 +0200
                Re: Because of MIMD you have to reassess algorithms (Re: I never used OpenGL Version 4.2 and later) "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-07-22 13:34 -0700
                Do you see the loops, in C code and in Java code? /** Looping **/ (Was: Because of MIMD you have to reassess algorithms) Mild Shock <janburse@fastmail.fm> - 2026-07-23 00:09 +0200
                Re: Do you see the loops, in C code and in Java code? /** Looping **/ (Was: Because of MIMD you have to reassess algorithms) Mild Shock <janburse@fastmail.fm> - 2026-07-23 00:53 +0200
                Re: Do you see the loops, in C code and in Java code? /** Looping **/ (Was: Because of MIMD you have to reassess algorithms) "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-07-22 18:00 -0700
                Re: Do you see the loops, in C code and in Java code? /** Looping **/ (Was: Because of MIMD you have to reassess algorithms) "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-07-22 18:20 -0700

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