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Nowadays, there are lots of naive peope cheering "Containers! Docker! Hallelujah!", believing that once you have put the stuff into a container, it is "build once, run anywhere!" Sure...! The interface between host and the running container is, at the functional level, reasonably simple; it is realistic to implment it on "any" architecture. But inbetween the host/container interactions, the container is on its own - together with the CPU, of course.
When Apple jumped from 68K to x86, they developed an emulator for running 68K code on the x86 that was surprisingly efficient. There is nothing like that in the Docker container. If the machine code inside the container is x86, the CPU better be x86, too! "Run anywhere, provided that you are on an x86" is sort of "You can have the T-Ford in any color you want, as long as you want it it black". Lots of Docker affectionados haven't realized that yet.
Obviously, the host may - outside the container - provide an emulated CPU by having, say, a PPC cpu interpret in software every x86 instruction code. You could hardly describe that as "lightweight" virtualization! And for it to be universally "run anywhere", every Docker host would have to be able to emulate any instruction set that might be found within a container.
I wonder if MS is working on containerization where the code inside consists of dotNet assemblies, compiled on-the-fly to the native code of the host. That could be (part of) a solution for truly build once, run everywhere. (The CLR sort of provides (parts of) this, but without the container protection.) I think that Docker containers will live for many years, but it is certainly not the last word in container technology. My guess is that the container/host interface in future techologies may include some JIT code generating, so that the container at startup (/JIT) deliver something like an assembly to host and get the native binary code back for execution in the containerized enviromment. That will probably be in a container framework different from today's Docker, though.
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The real reason is that everyone and his kid brother have taken Linux, and bent/folded/stapled it so that it is incompatible with any other version (including those compiled for the same hardware). In other works, there is no agreed ABI which guarantees that a shared library compiled for x64 on one system will run on another x64 system.
In this jungle, the only way to ensure that code will work is to compile it locally. If the code compiles (sometimes - this is a big if...), it will probably work on your machine. Otherwise, you're SOL.
Note that even compiling without error is no guarantee of proper working - see Chemists bitten by Python scripts: How different OSes produced different results during test number-crunching • The Register
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
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Sander Rossel wrote: I wonder if the same goes for multi-platform .NET Core
I think so ... unless you need a user-interface with some more-than=stupid controls on it that are not grafted on by running a browser under the hood 
«One day it will have to be officially admitted that what we have christened reality is an even greater illusion than the world of dreams.» Salvador Dali
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Sander Rossel wrote: Especially the DataGridView was a horror to work with
It still is... 
"When you are dead, you won't even know that you are dead. It's a pain only felt by others; same thing when you are stupid."
Ignorant - An individual without knowledge, but is willing to learn.
Stupid - An individual without knowledge and is incapable of learning.
Idiot - An individual without knowledge and allows social media to do the thinking for them.
modified 19-Nov-21 21:01pm.
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Sander Rossel wrote: That rules out any controls .NET has to offer
Hi Sandor,
Let me clarify my comment: imho, in this later stage of personal computing where rich user interfaces are the norm, the Catch-22 of any attempt at having a multi-OS dev solution is that really rich, complex, controls ... not buttons, checkboxes, monofont textboxes ... probably need to access OS dependent facilities under-the-hood for platform-centric look-and-feel, for rendering speed and fidelity.
The emergence of web browsers driven by JavaScript as a lowest common denominator solution for multi-OS apps is the major current solution, but, that means your not-a-web-app has to add a browser engine, and interact with it to invoke the platform-dependent goodness.Sander Rossel wrote: I remember the WinForms controls were not even half-decent
imho, for their time, they were useful, and free, and their limitations drove a thriving 3rd, party control industry, as well as many wonderful CP articles.
cheers, the old fossil, Bill
«One day it will have to be officially admitted that what we have christened reality is an even greater illusion than the world of dreams.» Salvador Dali
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Safe and protective in that so long as you don't venture out all the parts (at least in theory) work together and consistently.
Perhaps modify that to .NET on Windows - or may .NET on WindowsN. For, you see, code I wrote for XP didn't quite work on 7 - but I got it to work. But them more changes came about - Win7 on VMWare started to stop working.
If one stays completely in a single world it becomes, as Candid was taught by his mentor, Pangloss, 'since this is the only possible world then it is the best of all possible worlds".
| Ravings en masse^ |
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| "The difference between genius and stupidity is that genius has its limits." - Albert Einstein | | "If you are searching for perfection in others, then you seek disappointment. If you seek perfection in yourself, then you will find failure." - Balboos HaGadol Mar 2010 |
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Quote: The real reason is that everyone and his kid brother have taken Linux, and bent/folded/stapled it so that it is incompatible with any other version
Amen.
GCS d--(d+) s-/++ a C++++ U+++ P- L+@ E-- W++ N+ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t+ 5? X R+++ tv-- b+(+++) DI+++ D++ G e++ h--- r+++ y+++* Weapons extension: ma- k++ F+2 X
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The sense of accomplishment?
Because he wants to see how many compiler warnings the developer is ignoring?
Because he can check the code carefully to ensure it doesn't contain ransomware?
Because he's desperate to find anything that runs on Linux? 
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
AntiTwitter: @DalekDave is now a follower!
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Quote: Because he's desperate to find anything that runs on Linux?
It could be worse. It could be PIC32.
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Quote: It could be worse. It could be PIC32.
Do not even joke about it!
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Don't be sad, you should rather enjoy the development on PIC32 and his cousins!
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It's the whole 32 bit thing threw me when I wasn't aware of it...
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I find it (programming for 32 bit MCUs, compared to programming for 16 and 8 bit ones) simplier. I really enjoy C++ with PIC32.
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I got it dumped on me due to the previous guy leaving, didn't really have time to use it properly, I was doing 4 bit (support), 8 bit & 16 bit... really ought to look at it again when I have time.
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Because he/she would otherwise have to support all the possible architectures, OS versions and so on.
If the code works and the libraries are included then anyone can very easily compile it and run it, plus it is easily embeddable in the end project themselves.
GCS d--(d+) s-/++ a C++++ U+++ P- L+@ E-- W++ N+ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t+ 5? X R+++ tv-- b+(+++) DI+++ D++ G e++ h--- r+++ y+++* Weapons extension: ma- k++ F+2 X
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Sander Rossel wrote: I believe this is standard practice for everything ever written for Linux,
Another reason Linux will never overtake Windows.
Social Media - A platform that makes it easier for the crazies to find each other.
Everyone is born right handed. Only the strongest overcome it.
Fight for left-handed rights and hand equality.
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Didn't that already happen? 
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Never already happened?
Social Media - A platform that makes it easier for the crazies to find each other.
Everyone is born right handed. Only the strongest overcome it.
Fight for left-handed rights and hand equality.
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Have a look at your phone, your watch, your router... Or at least, mine.
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You car... of the 50-130 ECU a car produced in the last 20 years has there are Linux systems, I myself am working on an embedded Linux placed in the connectivity ECU, which is now mandatory in the US for the legislastive emergency calls.
GCS d--(d+) s-/++ a C++++ U+++ P- L+@ E-- W++ N+ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t+ 5? X R+++ tv-- b+(+++) DI+++ D++ G e++ h--- r+++ y+++* Weapons extension: ma- k++ F+2 X
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Ah, I see what you mean. I was referring to personal computers.
Social Media - A platform that makes it easier for the crazies to find each other.
Everyone is born right handed. Only the strongest overcome it.
Fight for left-handed rights and hand equality.
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Quote: I was referring to personal computers.
Actually I guessed that. But...
- I just can't help myself from kidding.
- Some general awareness of how much Linux is 'embedded in our lives' could be useful.
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