[squeak-dev] Re: Some notes about SqueakMap dead in trunk
goran at krampe.se
Mon Mar 15 23:32:38 UTC 2010
Andreas Raab wrote:
> On 3/15/2010 1:26 PM, Göran Krampe wrote:
>> But so far I am unclear as to why this is so. I have now tested LOTS of
>> trunk images backwards and it seems to be broken all the way down to
>> 7179! Funny thing is - my 3.10.1-7175 image works fine.
>> And there may be a hint here: The 7175 image can be opened by an old
>> 3-9-8 VM. But the later 7179 images can NOT be opened due to some kind
>> of image format change.
> Bingo. The issue is that the image format changed for closures and
> there's been a bug in the image segment loading code that makes the
> primitive fail in cases where the image format is older, but compatible.
Ah, good that we know what it is then.
> I've posted a fix for that in VMMaker but I really think SM should stop
> using image segments for data exchange. Image segments are not a
> reliable long-term interchange format in an evolving system.
Sure, I am all in agreement. I am slightly amazed we got away with it
this long :)
When it comes to persistence I am pretty sold on CouchDB these days. If
you just have the ability to make trivial HTTP GETs and parse JSON -
then you can load stuff from a CouchDB instance.
Anyway, I really need to sleep but we should take SM by the balls and
make a plan for how to evolve it into the next 10 years :)
SqueakMap was born somewhere in 2002 IIRC.
> Obviously, this fix requires new VMs.
> - Andreas
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