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The last time I played with a Smalltalk, all the code was one big image. There was no way to run multiple VMs.



> There was no way to run multiple VMs.

In this example on Ubuntu "visual" is the name of the VM file, and there are 2 different image files with different code in them "visualnc64.im" and "quad.im".

    $ /opt/src/vw8.3pul/bin/visual /opt/src/vw8.3pul/image/visualnc64.im &
    [1] 8689 

    $ /opt/src/vw8.3pul/bin/visual /opt/src/vw8.3pul/image/quad.im &
    [2] 8690
That's created 2 separate OS processes, each OS process is running an instance of the Smalltalk VM, and each Smalltalk VM opened a different Smalltalk image containing different code.

Do you see?


I’m not sure if we are talking past each other or you are ignoring the whole IDE thing. Yes, I can run multiple VMs on the same machine, but you are missing that I want to spin up these VMs in my Smalltalk IDE and not via some terminal launch script. I want my environment there for me to edit and debug code. I’m pretty sure you cannot do that in VisualWorks.


> I want my environment there for me to edit and debug code

Both of those instances of the Smalltalk VM, the one in OS process 8689 and the one in OS process 8690, are headfull — they both include the full Smalltalk IDE, they are both fully capable of editing and debugging code.

(There's a very visible difference between the 2 Smalltalk IDEs that opened on my desktop: visualnc64.im is as-supplied by the vendor; quad.im has an additional binding for the X FreeType interface library, so the text looks quite different).

(iirc Back-in-the-day when I had opened multiple Smalltalk images I'd set the UI Look&Feel of one to MS Windows, of another to Mac, of another to Unix: so I could see which windows belonged to which image.)


Yeah, but they are 2 IDEs not a single IDE. You are running two copies not one copy with two instances. I then need to jump between programs to edit code.


So when I asked "What will that let you do?", the only "benefit" you-can-think-of is the possibility of switching from editing code in visualnc64.im to editing code in quad.im without a mouse-click ?


So when I asked "What will that let you do?", the only "benefit" you-can-think-of is the possibility of switching from editing code in visualnc64.im to editing code in quad.im without a mouse-click?

No, that would not be enough to make anything work. What I can think of is an IDE that had access to all the VMs running and some plumbing for the VMs to communicate. I would love to be able to spin-up Smalltalk VMs so I can simulate a full system on my desk. Having separate IDEs running means I don't have any integration so I have to debug in multiple different IDEs when tracing communications. I can imagine some of the debugging and code inspection that could be extended to look at code running simultaneously in multiple VMs.


Already mentioned up thread — Distributed Smalltalk.

"Open a debugger where you can trace the full stack on all involved machines."

"Inspect objects in the debugger or open inspectors on any of the objects, regardless of the system they are running on."

April 1995 Hewlett Packard Journal, Figure 7 page 90

https://www.hpl.hp.com/hpjournal/95apr/apr95a11.pdf


I want it all, not just debugging. Distributed Smalltalk didn't do it all in one IDE.




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