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:zz,virt: Reply2 re Rampant Sewing Machines


As I see the problem--

To sum up: the problem I see is desirable final result
 in the global data tissue, which is a virtuality issue.

If we stick to well-ordered operations which keep the
 structure orderly, there's no problem.  (Eg each process
 creates a parallel rank of cells, stitching them in a
 perpendicular direction.  Doesn't matter what order
 the cells appear in each rank, the stitching works regardless.)

BUT if we set operations going which modify the tissue
 in different ways and directions, the problem is still
 visualizing and planning a reasonable result.

In a subset of cases, where a reasonable result is
 created by one class of operation sequencing and not
 another, we can define those classes and subject them
 to concurrency.  But that's a subset.

Best, Ted

At 05:01 PM 4/11/99 -0700, you wrote:
>At 08:32 AM 4/11/99 , Ted Nelson wrote:
>>Hi Mark--
>>The problem isn't concurrency.  The problem is the
>> complex tissue structure of ZigZag.
>In the absence of concurrency, would the complex tissue structure be a 
>>A wonderful image just occurred to me: a lot of berserk
>> sewing machines on wheels, stitching everything in your
>> closet together chaotically.
>In terms of this analogy, would you have the same problem with only one 
>sewing machine?
>If the answers are "yes", then I'm confused.
>If the answers are "no", then concurrency -- as conventionally understood -- 
>*is* the problem.  From your description I'm even more confident that E's 
>event-loop alternative can help.
>	Cheers,
>	--MarkM
Theodor Holm Nelson, Visiting Professor of Environmental Information
 Keio University, Shonan Fujisawa Campus, Fujisawa, Japan
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QOD 99.03.31
"Everything is like everything else, but some of the resemblances are
harder to see."  TN99