<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Hi Trygve,<div dir="ltr"><br><blockquote type="cite">On Apr 5, 2020, at 2:47 AM, Trygve Reenskaug <trygver@ifi.uio.no> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
I'm struggling with a new .image3 extension. It seems that <i>Squeak
Cog Spur Virtual Machine </i>actually <b>KNOWS </b>that all
images have the <b>.image</b> extension. This seems to mean that I
can't run two different Squeak generation images within the same OS
instance.<br></div></blockquote><div><br></div>there’s no restriction on running multiple kinds of image or multiple images or multiple instances of the same image. One can always drop an image on the right vm, or manually launch a specific vm with a specific in a shell.<div><br></div><div>The issue is only having double clicking select an appropriate vm for the image, and for that you’re right that one needs a wrapper.</div><div><br></div><div>Pharo has a wrapper implemented in Smalltalk, PharoLauncher, that could be adapted. VisualWorks has a small wrapper and an ini file, VisualWorks.exe & VisualWorks.ini IIRC (know it? I wrote it).</div><div><br></div><div>It wouldn’t be hard to implement the wrapper solution. I’ll try and get that done in the next few days. But then it has to get pushed through to production, to be built using some kind of CI. And of course it makes sense on all platforms.</div><div><br><blockquote type="cite"><div dir="ltr">
<br>
I'll try running my 3.10.2 under <i>Cog Spur Virtual Machine</i>. I
hope it works.<br></div></blockquote><div><br></div>It won’t. Spur 32-bit VMs are the only VMs that can run 32-bit Spur images, Spur 64-bit VMs are the only VMs that can run 64-bit Spur images, etc. it isn’t just a matter of converting each individual object. There are bytecode set, closure design, identity hash and object enumeration method, and other Smalltalk-level differences that mean automatically converting images is impossible.</div><div><br></div><div>Converting between 32-bit and 64-bit Spur images *is* automatable and there is a program (a Spur image) I should package up to do it. But it takes a few seconds and requires VMMaker, so it is not small, and so is not something to add the the vm and have some images takes seconds to launch instead of milliseconds.</div><div><br><blockquote type="cite"><div dir="ltr">
<br>
<br>
<div class="moz-cite-prefix">On 04-Apr-20 9:13 PM, tim Rowledge
wrote:<br>
</div>
<blockquote type="cite" cite="mid:2AE5C91E-F08A-4B73-B38F-7D5ED3266614@rowledge.org">
<pre class="moz-quote-pre" wrap="">We were discussing this with regard to the 5.3 release but didn't have time to sort out. Having a wrapper that checks the image file format and picks the right vm is not in principle difficult; we just need someone to write it.
The unix package for example already has a shell script that does a fair bit of fiddle-faddle. Adding use of the image format command wouldn't make a lot of difference.
tim
--
tim Rowledge; <a class="moz-txt-link-abbreviated" href="mailto:tim@rowledge.org">tim@rowledge.org</a>; <a class="moz-txt-link-freetext" href="http://www.rowledge.org/tim">http://www.rowledge.org/tim</a>
"Virtual Memory" means never knowing where your next byte is coming from.
</pre>
</blockquote>
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Roman";mso-ansi-language:
EN-US" lang="EN-US">The essence of object orientation is
that objects <span class="GramE">collaborate<span style="mso-spacerun:yes"> </span>to</span> achieve a
goal. </span></i><span style="font-size:10.0pt;mso-fareast-font-family:"Times
New Roman";
mso-ansi-language:EN-US" lang="EN-US"><br>
<span class="SpellE">Trygve</span> <span class="SpellE">Reenskaug</span> </span><span style="font-size:10.0pt;mso-fareast-font-family:"Times
New Roman""><a href="mailto:%20trygver@ifi.uio.no"><span style="mso-ansi-language:
EN-US" lang="EN-US">mailto: trygver@ifi.uio.no</span></a></span><span style="font-size:10.0pt;mso-fareast-font-family:"Times
New Roman";mso-ansi-language:
EN-US" lang="EN-US"><br>
<span class="SpellE">Morgedalsvn</span>.
5A </span><span style="font-size:10.0pt;
mso-fareast-font-family:"Times New Roman""><a href="http://folk.uio.no/trygver/"><span style="mso-ansi-language:EN-US" lang="EN-US">http://folk.uio.no/trygver/</span></a></span><span style="font-size:10.0pt;mso-fareast-font-family:"Times
New Roman";
mso-ansi-language:EN-US" lang="EN-US"><br>
N-0378
Oslo </span><span style="font-size:10.0pt;mso-fareast-font-family:"Times
New Roman""><a href="http://fullOO.info"><span style="mso-ansi-language:EN-US" lang="EN-US">http://fullOO.info</span></a></span><span style="font-size:10.0pt;mso-fareast-font-family:"Times
New Roman";
mso-ansi-language:EN-US" lang="EN-US"><br>
Norway Tel:
(+47) 22 49 57 27 </span><span style="font-size:10.0pt;mso-ansi-language:
EN-US" lang="EN-US"><o:p></o:p></span></p>
</div>
</div>
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