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Groups > sci.physics.relativity > #672374

Doing uux with pi-calculus and WAM (Re: Robin Milners fickle gives non-determinism in practice [Parallel π-WAM])

Cross-posted to 2 groups.

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Hi,

I find an early precendent of a command
in a unix system, which has an interesting
flavor, that goes beyond Web Prolog Trinity

RPC nonsense. Take this command:

uux merlin!wc < venus!/paper/*.tex > mars!/stats/*.txt
https://www.ibm.com/docs/en/aix/7.1.0?topic=u-uux-command

So basically wc, i.e. word count is executed
on merlin, takes data from venus and moves it
to marks. We can do the same with pi-WAM,

currently experimenting with a non-blocking
execute/1 built-in, spawn/2:

?- chan(In), chan(Out),
    spawn((recv(3,[Z]), wc(Z,T), send(4,[T])), [comm([In,Out])]),
    venus(X),
    send(In,[X]), repeat, recv(Out,[Y]),
    mars(Y).

But maybe introducing in/1 and out/1 options
to spawn/2, would be more easier to write,
now I have split spawn/2 into prepare/3 and run/1.

?- chan(In), chan(Out),
    prepare(wc(X,Y)), [in(X), out(Y)], P),
    venus(X),
    run(P),
    mars(Y).

But the point is to do prepare/3 only once,
and do mars and venus later. It also reflects
the ordering on a uux command:

1               2                    3
uux merlin!wc < venus!/paper/*.tex > mars!/stats/*.txt

But we wouldn't do it alone for this cosmetic.
The idea is that the spawned process is using
its channels, to do more than only one job.

Bye


Mild Shock schrieb:
> Hi,
> 
> Hi take Robin Milners fickle:
> 
> ?- emulate((between(1,2,Y),in(X),out(Y))).
> : 0
> 1
> : 0
> 2
> fail.
> 
> If I use NUM=3, number of logical threads,
> and common input [0, 0, 0, 0, 0, 0].
> 
> I might get this common output:
> 
> [1, 2, 1, 2, 1, 2]
> 
> Or this common output:
> 
> [1, 1, 2, 2, 1, 2]
> 
> Or this common output:
> 
> [1, 1, 1, 2, 2, 2]
> 
> What else? Did I miss some case?
> 
> Can be seen on GPU and CPU backend, depending
> on launch parameters. (*)
> 
> Bye
> 
> (*) If logical threads are executed together in
> work groups, certain guarantees of determinism
> might hold. But modern GPUs usually support
> 
> multiple independent work groups, also my CPU
> backend does support a notion of multiple
> independent work groups. So that the determinism
> 
> guarantees only hold inside the work group.
> 
> Mild Shock schrieb:
>> Hi,
>>
>> Probably blinded by some academic remoteness
>> from the real world, some people really believe
>> nonsense like the following:
>>
>> Deterministic Concurrency - Edward Lee
>> deterministic models as a central part of the engineering toolkit
>> https://icfp26.sigplan.org/track/icfp-2026-icfp-keynotes#event-overview
>>
>> But hey Aristoteles present us already with
>> modal logic to talk about the future. So
>> if I have a process calculus, with expressions
>>
>> π, that capture all my processes of interest,
>> I can have a modal logic of with modal operators
>> [π] and <π> that give necessity and possibility,
>>
>> the simplest first order bootstrapped types are:
>>
>> Product Type:
>> A -> [π]B
>>
>> Sum Type:
>> A /\ <π>B
>>
>> So we need more than only a ->π type? But even
>> with two types, is there an easy equivalent of
>> Curry Howard isomorphism?
>>
>> In contrast Amir Pnueli's 1977 system of temporal
>> logic, another variant of modal logic sharing many
>> common features with dynamic logic, differs from all
>> of the above-mentioned logics by being what Pnueli
>> has characterized as an "endogenous" logic,
>> the others being "exogenous" logics.
>> https://en.wikipedia.org/wiki/Dynamic_logic_%28modal_logic%29
>>
>> The Sea Battle and the Master Argument
>> Aristotle and Diodorus Cronus on the Metaphysics of the Future
>> https://www.degruyterbrill.com/de/document/doi/10.1515/9783110866346/html
>>
>>
>>
>> Mild Shock schrieb:
>>> Hi,
>>>
>>> For marketing purposes people
>>> typically look at the race towards
>>> 2nm, and we find:
>>>
>>> A month ago, Apple lost its exclusivity
>>> on 3 nm smartphone processors with
>>> MediaTek’s Dimensity 9400 chip, integrated
>>> in the Vivo X200 Pro smartphone. Qualcomm
>>> is also in the race with its recently
>>> unveiled Snapdragon 8 Elite and set to
>>> power the Xiaomi 15 Pro in 2025. However,
>>> Apple should regain its position as innovation
>>> leader in 2026 with the release of the
>>> iPhone 18, which should feature the A20
>>> chip built on TSMC’s 2 nm process."
>>>
>>> But there is a vertical vias revolution
>>> going on as well, some SOCs typically
>>> being at 18 layers now:
>>>
>>> Zooming Into a CPU (It's Incredible)
>>> https://www.youtube.com/watch?v=Bez-2cvYja0
>>>
>>> imec has coined the term CMOS 2.0:
>>>
>>> LEUVEN (Belgium), MARCH 12th, 2026 — Imec,
>>> a world-leading research and innovation hub
>>> in advanced semiconductor technologies, has
>>> launched a first-of-its-kind consortium with
>>> 26 European university groups that will jointly
>>> work on the technology roadmap beyond
>>> CMOS scaling (CMOS 2.0).
>>> https://www.imec-int.com/en/press/imec-launches-university-consortium-around-next-generation-chips 
>>>
>>>
>>> So we might see more mobile grade GPUs.
>>>
>>> Bye
>>
> 

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Thread

Type systems for non-deterministic concurrency [Amir Pnueli] (Re: Creating a "European CMOS 2.0 Army") Mild Shock <janburse@fastmail.fm> - 2026-07-20 12:23 +0200
  Robin Milners fickle gives non-determinism in practice [Parallel π-WAM] (Re: Type systems for non-deterministic concurrency [Amir Pnueli]) Mild Shock <janburse@fastmail.fm> - 2026-07-20 12:35 +0200
    Doing uux with pi-calculus and WAM (Re: Robin Milners fickle gives non-determinism in practice [Parallel π-WAM]) Mild Shock <janburse@fastmail.fm> - 2026-08-24 20:15 +0200
      Does it have a declarative reading? (Re: Doing uux with pi-calculus and WAM) Mild Shock <janburse@fastmail.fm> - 2026-08-24 20:44 +0200
        MCP = uux with streaming JSON (Re: Does it have a declarative reading?) Mild Shock <janburse@fastmail.fm> - 2026-08-24 22:28 +0200

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