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imageAtomicAdd trivial, Dmitry Vyukov requires capacity (Re: Flogging a Dead Horse, OpenGL is EOL)

From Mild Shock <janburse@fastmail.fm>
Newsgroups sci.logic, comp.lang.prolog, sci.physics
Subject imageAtomicAdd trivial, Dmitry Vyukov requires capacity (Re: Flogging a Dead Horse, OpenGL is EOL)
Date 2026-07-21 01:40 +0200
Message-ID <113mbkr$4kvj$3@solani.org> (permalink)
References (1 earlier) <113i6to$1r2p$2@solani.org> <113kfgk$3b4e$2@solani.org> <113m3q9$5496$2@solani.org> <113m6l8$561a$2@solani.org> <113mbjh$4kvj$2@solani.org>

Cross-posted to 3 groups.

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Hi,

imageAtomicAdd is trivial, but it does
not help with bounded buffers. I already
did imageAtomicAdd, in an experiment,

where pi-WAM implemented an in and out
buffer as follows in Java, which can
be trivially ported to WebGPU / WGSL,

by using atomic(i32) and AtomicAdd:

    private static final class PiChan {
         private int[] buf;
         private AtomicInteger pos;
     }

     private static final class PiWam {
         private PiChan in;
     Etc...
     }

    case 5: /* in */
         int at = pi.in.pos.getAndAdd(obj);
         for (int i = 0; i < obj; i++)
              pi.state[offset + i] = pi.in.buf[at + i];
         return 0;

But this is not the same like Dmitry
Vyukov buffer. Which has a maximum
capacity, and fails to go beyond this

capacity filling a buffer by a producer,
before a consumer made the buffer not
full again. My requirement for pi-WAM

are bounded buffers with a finite capacity.

Bye

Mild Shock schrieb:
> Hi,
> 
> But I am nowhere using WebGL / GLSL.
> The experiment here GPU versus CPU,
> was done with WebGPU / WGSL:
> 
> 11.4 Giga Lips with a Budget Laptop
> https://github.com/Jean-Luc-Picard-2021/gigabudget
> 
> Parallel π-WAM: 1.7 Giga Lips on a CPU
> https://medium.com/2989/8a984e75af44
> 
> I do not intend to redo the experiment
> "gigabudget" with WebGL / GSLS. It would
> appear to me like flogging a dead horse,
> 
> a technology that has reached EOL, namely
> OpenGL which is in the phase of end of lifetime.
> 
> Bye
> 
> Mild Shock schrieb:
>> Hi,
>>
>> I am developing against WebGPU / WGSL.
>> An overview of WebGPU / WGSL is found here:
>>
>> https://github.com/webgpu/webgpufundamentals
>>
>> There is no imageAtomicAdd in WGSL.
>> imageAtomicAdd is from WebGL / GLSL.
>>
>> These are two different things:
>>
>> WebGPU / WGSL : Wrapper for Vulcan, Direct 12, or Metal
>> WebGL / GLSL : Wrapper for OpenGL
>>
>> Chris M. Thomasson schrieb:
>>  > imageAtomicAdd is a damn good one for accumulation buffers.
>>
>> Mild Shock schrieb:
>>> Hi,
>>>
>>> I didn't find Futex in WebGPU / WGSL.
>>> The website WebGPU fundamentals is on
>>> GitHub. I did a search here:
>>>
>>> https://github.com/webgpu/webgpufundamentals
>>>
>>> In Java I can use Doug Leas queue.
>>> In WebGPU / WGSL I will mostlikely
>>> adopt Dmitry Vyukov , for a first stab.
>>>
>>> Who is Doug lea?
>>>
>>> He wrote Concurrent Programming in
>>> Java: Design Principles and Patterns
>>> https://en.wikipedia.org/wiki/Doug_Lea
>>>
>>> He is behind most of the concurrency promitives
>>> in Java. Including the array backed queue that
>>> I tested. Remember the results I had:
>>>
>>> public class DmitryVyukov
>>> 8 ms
>>> public class DougLea
>>> 10 ms
>>>
>>> Bye
>

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      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

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