[Vm-dev] Multi-Image Sista VM?

[Clément Béra]

On Sat, May 2, 2020 at 8:06 PM Robert <robert.withers at pm.me> wrote:

>
> On 5/1/20 2:59 PM, Clément Béra wrote:
>
> The Hydra VM from Igor was doing exactly that.
>
> Stellar! Could we reintegrate with the latest squeak.cog.spur?
>

Hydra was a fork of the pre-stack VM. I don't know where is the code. Igor
may be able to answer. Ask him.

As Tim said, it's not clear there is a high benefit from running many image
on 1 VM vs multiple images, each on their VM. One advantage could be the
speed of communication between the images. However, it's possible to have a
byte array on a Posix Shared Memory section (Pavel had made some FFI
bindings to do that) that is shared between multiple images. I'm sure with
a clever design one could share more than just a byte array. With a shared
memory section and external semaphores, it's not clear there are good
use-cases that would require multiple images on 1 VM.

> The Actor model in Newspeak is also somewhat similar to that, though part
> of the image is shared between threads.
>
> I believe the Newspeak Actors are implemented with local capabilities,
> from ELib, just as my CapabilitiesLocal package. DoIt:
>
> Installer ss project: 'Cryptography'; install: 'CapabilitiesLocal'.
>
> works. Both implement a ELib Promise system with async resolution and
> resolved promise reactor invocation.
>
> Would you be able to say a few words about their use of shared memory,
> please? As well, what could you mention about their use of promises,
> regarding Ease of use, understandable code, tips & tricks with promises?
>

I think Ryan could answer in a better way.

My understand is that NewSpeak have value objects, which are immutable, and
such objects can be shared between actors, including classes, methods and
so on.
Not sure about promise. Ryan, can you answer?

K, r
>
>
> Not sure what is the status of these projects though.
>
> On Wed, Apr 29, 2020 at 8:43 PM Robert <robert.withers at pm.me> wrote:
>
>>
>> I have not read about this anywhere I can remember. Would it be possible
>> to run two images on one VM?
>>
>> Preggo,
>> Robertotini
>>
>> Sent from ProtonMail Mobile
>>
>
>
> --
> Clément Béra
> https://clementbera.github.io/
> https://clementbera.wordpress.com/
>
> --
> Kindly,
> Robert
>
>

-- 
Clément Béra
https://clementbera.github.io/
https://clementbera.wordpress.com/
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